Re: [rtl] Interrupts
On Thu, Jun 22, 2000 at 03:29:23PM +0100, Stuart Hughes wrote: What is a good complaint ??? doesn't the 'P' in POSIX stand for portable ? What you continually offer is non-portable extensions that make it impossible to run the same code on any environment other than RTLinux. Continually? Really, the API has been pretty dull for nearly a year. But RTLinux _is_ different than other environments. A better idea might be to use what exists so that we all have a chance of running our code on a number of operating systems. May I suggest that a SIGHUP may be construed as a wakeup signal to a thread (it has been used context before), this may be bogus too, but you get the idea: try to use something that has a chance of being portable. SIGHUP is fine. Actually, WAKEUP is defined as 1 so SIGHUP will do the same thing. I'm not sure if it is better, however, to pretend that we are doing something you can do in Chorus or PSOS. After all, you are sending an interrupt from the RTkernel to a Linux subthread and this is not something that "exists" or can be done on other operating systems. We've had this discussion before and I remain convinced (under the delusion?) that there are two different needs: 1. Pedal to metal, simple and appropriate APIs for RTLinux specific code: for this I like our LightWeight POSIX PThreads. Needs some fleshing out, but the technical soundness and coherency seem to me to have been proven out. 2. Compatibility libraries that make it easy to move code from legacy operating systems. What I most definitely do not want to do is to re-discover all the errors and ugliness in Chorus that made me want to have RTLinux in the first place. I realize that people who have huge Chorus or PSOS or ... programs will find it inconvenient that RTLinux native programs, designed using our idea of decoupling RT and non-RT will greatly outperform their code, but my theory is that the RTLinux approach to RT is fundamentally _better_ than prior programming models and I don't see any way to magically repair the damage created by mixing RT with non-RT in one incoherent mass of code. -- - Victor Yodaiken FSMLabs: www.fsmlabs.com www.rtlinux.com FSMLabs is a servicemark and a service of VJY Associates L.L.C, New Mexico. -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
[rtl] Chrash using network
After I insert modules for RTAI/LXRT (rtai, rtai_sched, lxrt), If I try to download a file via ftp to my target, the system always crash with a kernel panic. Crashes happen for rather large file ( 500K), for small file transfers seem to work. I am using RTAI1.3, Linux 2.2.14, and the upscheduler on a 486/100 embedded board with 16M ram, no swap disk. The network chipset is a PCI Realtek 8139. Note that I have no realtime user process/tasks module active (only the core module installed). If I don't install the realtime modules the system works fine. What could I do ? Best regards Eng. Nicola Pace -- TiscaliFreeNet, libero accesso ad Internet. http://www.tiscalinet.it -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] Chrash using network
npace wrote: After I insert modules for RTAI/LXRT (rtai, rtai_sched, lxrt), If I try to download a file via ftp to my target, the system always crash with a kernel panic. Crashes happen for rather large file ( 500K), for small file transfers seem to work. I am using RTAI1.3, Linux 2.2.14, and the upscheduler on a 486/100 embedded board with 16M ram, no swap disk. The network chipset is a PCI Realtek 8139. Note that I have no realtime user process/tasks module active (only the core module installed). If I don't install the realtime modules the system works fine. What could I do ? Best regards Eng. Nicola Pace Hi Nicolo, Do you have a hard drive in the system or is it loading to a RAM disk ?? Regards, Stuart -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] hrtime_t - int
Cory Papenfuss ([EMAIL PROTECTED]) wrote: Hey all... I've got something that's been bugging me for awhile on this project. I really only need millisecond resolution (since I'm logging data to disk), but the hrtime_t doesn't like to be divided by 1000 (NS_PER_MS), as it's a funky type. Any way I can get around that and get a millisecond timestamp? What do you mean it doesn't like to be divided? hrtime_t is just an alias for long long. On a related note, I've got a user-space app that can send new pthread_make_period_np periods (again in [ms]). Problem is that if I try to send a time greater than 2147 ms, the machine craps out. I suspect it's a rollover on my looptime = some_int_from_fifo * 100; pthread_make_periodic_np(thread[0], genesis+OFFSET, looptime); What's a good way to do arithmetic on these hrtime_t creatures? looptime = some_int_from_fifo * (long long) 100; Michael. -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] Chrash using network
npace wrote: After I insert modules for RTAI/LXRT (rtai, rtai_sched, lxrt), If I try to download a file via ftp to my target, the system always crash with a kernel panic. Crashes happen for rather large file ( 500K), for small file transfers seem to work. I am using RTAI1.3, Linux 2.2.14, and the upscheduler on a 486/100 embedded board with 16M ram, no swap disk. The network chipset is a PCI Realtek 8139. Note that I have no realtime user process/tasks module active (only the core module installed). If I don't install the realtime modules the system works fine. What could I do ? I have tried it under a PC-104, 486 DX66 with a flash Diskonchip2000. With the hard real time lxrt sem_clock example running, i.e. with a significant load, I've dowloaded tens of megabytes, at 4 Mbytes/s, many times, without any problem. Ciao, Paolo. -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] More interrupt confusion
eric keller ([EMAIL PROTECTED]) wrote: We were running the nice example programs from Mirko Holler. Looking at parport.c, he calls rtl_request_irq(7, handler) then he does this: outb_p(inb_p(0x21) (~0x80),0x21); //enable interrupt 7 outb_p(0x20,0x20); //clear in service register rtl_hard_enable_irq(7); This program directly manipulates the interrupt controller to enable its interrupt line. does this code make sense? or is it redundant? eric For RT-interrupts, the low-level irq handling code works as follows handler: mask_interrupt_line ack_irq_controller call RT-handler return_from_interrupt So if it's needed to receive further interrupts from the device, one has to explicitely re-enable the interrupt line in the handler. Michael. -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] More interrupt confusion
Michael Barabanov wrote: For RT-interrupts, the low-level irq handling code works as follows handler: mask_interrupt_line ack_irq_controller call RT-handler return_from_interrupt So if it's needed to receive further interrupts from the device, one has to explicitely re-enable the interrupt line in the handler. Michael. That's the way i understand it. What i didn't quite understand is this code where he installs the interrupt handler rtl_no_interrupts(f); status = rtl_request_irq(7, intr_handler); /* enbable parallel port interrupt */ outb_p(inb_p(0x37A) | 0x10, 0x37A); outb_p(inb_p(0x21) (~0x80), 0x21); //confusing outb_p(0x20, 0x20);//confusing rtl_hard_enable_irq(7); rtl_restore_interrupts(f); I added comments where i am confused. He directly manipulates the irq controller in those lines. My understanding of rtl is that you don't have to do that, so i took those two lines out, but it didn't work always. Then i took out the lines where he says rtl_no_interrupt and rtl_restore_interrupt and then it works again. Now my code looks like this: status = rtl_request_irq(7, intr_handler); /* enable parallel port interrupt */ outb_p(inb_p(0x37A) | 0x10, 0x37A); rtl_hard_enable_irq(7); This should install the interrupt 7 handler and enable interrupt 7, right? thanks, eric -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
[rtl] Re: [realtime] Experiences with Real-Time Tulip driver
We will use [EMAIL PROTECTED] in future. I believe we will wait for your new version of RT_Tulip. I agree that we should be comparing worst case times since RT_tulip is there to control this worst case behaviour. However, I have to believe something is wrong with our set up since the RT_Tulip roundtrip latencies are coming out so much larger than TCP. A factor of 100 tells me something is not right. I think people might accept RT_Tulip that is 10x slower in *average* case than TCP if it means the worst case is well bounded, but a 100x? Gautam [EMAIL PROTECTED] wrote: Please send queries to [EMAIL PROTECTED] as the realtimelinux mailing list is one we don't monitor often. RT_tulip has worked well for us in the past. We intend to make a new version in the next month or two. Please compare round trip latency -- worst cases. Generic TCP/IP will be good in average case but RT_tulip is designed to reduce worst case. On Thu, Jun 15, 2000 at 03:47:20PM -0400, Gautam H Thaker wrote: We have been experimenting with the below: RT_Tulip: An RTLinux-based PCI Ethernet Realtime Driver A PCI Ethernet network driver for the Tulip Network card under Realtime Linux, that shares network bandwidth with Linux. Submitted by: Axel Bernal([EMAIL PROTECTED]) We are trying to simply send the string "hello_there" from one machine to another. We observe two things: 1) When the message gets to the receiver it is of correct length (11 bytes in this case) but it contains garbage. 2) The round trip message latency is coming in at about 6000 usec, or about 100x slower than generic DEC TULIP driver with a 4 byte TCP message round trip. 3) Entire system seems fragile and we see frequent crashes. 4) What can be done with RT_TULIP driver that can't be done with "tc" command and network QoS support such as CBQ queue discipline, etc.? Has this RT_TULIP worked for anyone? Is there anyone around that knows about this code or is this an old, dormant project. -- Gautam H. Thaker Distributed Processing Lab; Lockheed Martin Adv. Tech. Labs AE 3W; 1 Federal Street; Camden, NJ 08102 856-338-3907, fax 856-338-4144 email: [EMAIL PROTECTED] -- - Victor Yodaiken FSMLabs: www.fsmlabs.com www.rtlinux.com FSMLabs is a servicemark and a service of VJY Associates L.L.C, New Mexico. -- Gautam H. Thaker Distributed Processing Lab; Lockheed Martin Adv. Tech. Labs AE 3W; 1 Federal Street; Camden, NJ 08102 856-338-3907, fax 856-338-4144 email: [EMAIL PROTECTED] -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] hrtime_t - int
I've (sorta) figured it out. The int must first be cast as a long long
or the multiplication will overflow, but when I tried putting a division in a
rt-space function to return miliseconds since boot, I get
./init.o: unresolved symbol __divdi3
when I try to load up my init.o module. Is the access of the longlong division
forbidden within rt-space?
BTW, getlrtime that produced that error is little more than
unsigned long int getlrtime(void){
return((unsigned long)((long long)gethrtime() / 100LL)
}
-Cory
On Mon, 26 Jun 2000, Michael Barabanov wrote:
Cory Papenfuss ([EMAIL PROTECTED]) wrote:
Hey all... I've got something that's been bugging me for awhile on this
project. I really only need millisecond resolution (since I'm logging data to
disk), but the hrtime_t doesn't like to be divided by 1000 (NS_PER_MS), as
it's a funky type. Any way I can get around that and get a millisecond
timestamp?
What do you mean it doesn't like to be divided? hrtime_t is just
an alias for long long.
On a related note, I've got a user-space app that can send new
pthread_make_period_np periods (again in [ms]). Problem is that if I try to
send a time greater than 2147 ms, the machine craps out. I suspect it's a
rollover on my
looptime = some_int_from_fifo * 100;
pthread_make_periodic_np(thread[0], genesis+OFFSET, looptime);
What's a good way to do arithmetic on these hrtime_t creatures?
looptime = some_int_from_fifo * (long long) 100;
Michael.
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[rtl] Mbuff v0.6.6 Install
Hi, I'm using kernel 2.0.36 with RTL v0.9J. Currently I am using the old style shared memory (only have up to 4 MBytes). I need to increase this to support my maximum data storage. I have the .pdf instruction and have read the README and FAQ's that come with the source. So, this should be easy for someone to answer ... 1. Install in the README, it says, "Make sure you have in /usr/src/linux the configured source of the currently running kernel." is this a file named ".config" and how do I create one since there is not one there ? Janet Estabridis Electrical Engineer NAWC Code 473E00D Building 31440 Room 1017 China Lake, CA 93555 [EMAIL PROTECTED] (760) 939-2896 FAX (760) 939 -3075 -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] Mbuff v0.6.6 Install
"Estabridis, Janet P" wrote: Hi, I'm using kernel 2.0.36 with RTL v0.9J. Currently I am using the old style shared memory (only have up to 4 MBytes). I need to increase this to support my maximum data storage. I have the .pdf instruction and have read the README and FAQ's that come with the source. So, this should be easy for someone to answer ... 1. Install in the README, it says, "Make sure you have in /usr/src/linux the configured source of the currently running kernel." is this a file named ".config" and how do I create one since there is not one there ? Janet Estabridis Electrical Engineer NAWC Code 473E00D Building 31440 Room 1017 China Lake, CA 93555 [EMAIL PROTECTED] (760) 939-2896 FAX (760) 939 -3075 -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/ Hi Janet, I believe that this means that /usr/src/linux and /usr/include/asm should be symbolic links that point to the 2.0.36 RTL-0.9J kernel source files on your machine, Best regards, Steve -- Zentropix - A Lineo company. Visit http://www.zentropix.com/ -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] hrtime_t - int
On Mon, Jun 26, 2000 at 09:22:44AM -0500, Cory Papenfuss wrote:
I've (sorta) figured it out. The int must first be cast as a long long
or the multiplication will overflow, but when I tried putting a division in a
rt-space function to return miliseconds since boot, I get
./init.o: unresolved symbol __divdi3
when I try to load up my init.o module. Is the access of the longlong division
forbidden within rt-space?
Long long division requires a function call to a function that is
part of libgcc. Do to 'executive decision' in the kernel, i.e.,
it's been that way forever, libgcc is not linked with the kernel.
(Libgcc _is_ linked with the kernel for most non-i386 architectures,
however.) You have the option of making a difference 'executive
decision', and link your module with libgcc.
dave...
BTW, getlrtime that produced that error is little more than
unsigned long int getlrtime(void){
return((unsigned long)((long long)gethrtime() / 100LL)
}
-Cory
On Mon, 26 Jun 2000, Michael Barabanov wrote:
Cory Papenfuss ([EMAIL PROTECTED]) wrote:
Hey all... I've got something that's been bugging me for awhile on this
project. I really only need millisecond resolution (since I'm logging data to
disk), but the hrtime_t doesn't like to be divided by 1000 (NS_PER_MS), as
it's a funky type. Any way I can get around that and get a millisecond
timestamp?
What do you mean it doesn't like to be divided? hrtime_t is just
an alias for long long.
On a related note, I've got a user-space app that can send new
pthread_make_period_np periods (again in [ms]). Problem is that if I try to
send a time greater than 2147 ms, the machine craps out. I suspect it's a
rollover on my
looptime = some_int_from_fifo * 100;
pthread_make_periodic_np(thread[0], genesis+OFFSET, looptime);
What's a good way to do arithmetic on these hrtime_t creatures?
looptime = some_int_from_fifo * (long long) 100;
Michael.
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Re: [rtl] More interrupt confusion
status = rtl_request_irq(7, intr_handler); /* enable parallel port interrupt */ outb_p(inb_p(0x37A) | 0x10, 0x37A); rtl_hard_enable_irq(7); This should install the interrupt 7 handler and enable interrupt 7, right? Right. outb_p(inb_p(0x21) (~0x80), 0x21); //confusing outb_p(0x20, 0x20);//confusing These two are not needed. However, rtl_no_interrupts/rtl_restore_interrupts presence should make no difference. Do you mean that when they are present, you don't always get parport interrupts? Michael. PS What version of RTL is this? -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
[rtl] audio
Anyone here working on audio? -- - Victor Yodaiken FSMLabs: www.fsmlabs.com www.rtlinux.com FSMLabs is a servicemark and a service of VJY Associates L.L.C, New Mexico. -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
[rtl] SHM mmap question
Is it possible to use named files to access shared mem inside RTLinux
instead of /dev/mem ?
if ((fd = open("./file", O_RDWR)) 0)
{
/* handle error here */
}
ptr = mmap .
bye
steph
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[rtl] Floating Point???
Hi Gabor, Hoffman and all,
First, i'd like to apologize come back to this point now but in the last
days i've been trying to understand (trough your e-mails) and testing my
program to learn how can i use FP in my own programs, but to be honest some
things, even now, aren't clear for me.
Before talk about my doubts i'd like to thank Gabor for his help
about rtl_printf: I changed all printk with rtl_printf and my system began
work better although it still freeze sometimes. I'd like to thank Hoffman
too and everybody that sended e-mails about this point.
After my mail talking about my "system freezing" Hoffman asked me if the
floating point reference ("10.0") in my init_module() code couldn't be
causing the crash. Well, when he asked this i really didn't know the
answer, now (after many mails) seems to me that it could be the problem but
my practice results are bring me doubts.
To test my module i removed all the rtl_printf calls. Now my program seems
work very well, without crashs. Important points: I'm still using FP in my
init_module() and fifo handlers and i don't call pthread_setfp_np (or
something like that) in any point of my code.
Hoping you can help me to understand this,
Daniela.
P.S.: My module is attached. Sorry but i didn't have time to translate the
comments.
/* Driver para controle de um duplo integrador. Daniela Almeida 16/05/2000 */
/* This program makes the interface between a GUI (not RT) and AD/DA boards. It looks
for work with
2 kinds of AD/DA boards and V1.1 and V2.2 of RTL, both choosed through #define */
#ifndef MODULE
#define MODULE
#endif
#ifndef __KERNEL__
#define __KERNEL__
#endif
#ifndef __RT__
#define __RT__
#endif
// Define se o drive sera para a versao 1.1 ou 2.2 do RTLinux e se sera para a placa
DAS1600 ou AIO (STD)
//#define V1//Escolhe entre as versoes 1.1 e 2.2 do RTL
#define V2
//#define AIO //Escolhe entre as placas AD/DA AIO(STD) e DAS1601
#define DAS1600
#define OSC //Define se havera uma onda quadrada na porta paralela
para teste
#include linux/module.h
#include linux/kernel.h
#include linux/version.h
#include linux/errno.h
#include linux/cons.h
#include linux/ioport.h
#include linux/string.h
#include pthread.h
#include asm/io.h
#include rtl_sched.h
#include rtl_fifo.h
#include "declaracoes.h"
#ifdef AIO
#include "placa_ai.h" // header com os enderecos da placa AD/DA do STD
#endif
#ifdef DAS1600
#include "placa16.h" // header com os enderecos da placa AD/DA DAS1600
#endif
#ifdef V1
RT_TASK tarefa[2];
#endif
#ifdef V2
pthread_t tarefa[2];
#endif
//Definicao das variaveis de tempo
#ifdef V2
hrtime_t RT_TICKS_CTRL; //Variavel utilizada para determinar o tempo de amostragem
para o controle
hrtime_t RT_TICKS_SAVE; //Variavel utilizada para determinar o tempo de amostragem
para salvar os dados nas fifos
hrtime_t ONDA_QUADRADA;
hrtime_t ONDA_QUADRADA2;
#endif
#ifdef V1
RTIME RT_TICKS_CTRL; //Variavel utilizada para determinar o tempo de amostragem para
o controle
RTIME RT_TICKS_SAVE; //Variavel utilizada para determinar o tempo de amostragem para
salvar os dados nas fifos
RTIME ONDA_QUADRADA;
RTIME ONDA_QUADRADA2;
#endif
parametros_PID PID; // Ganhos do PID
mensagens MSG; // Mensagens de inicializacao e mudanca de periodo
float uf, vf;
int ub;
int valor;
float tensao;
float h;
float ek, pk, dk, otensao, ref;
float ik;
float N=20.0;
float Nh;
float escala; //escala de medicao: VADPP/4095.0 (converte para volts)
int a=1;
int range; // Range de enderecos ocupados pelo AD
int dispara_ad; //String que dipara o AD
int controle_ad; //String que controla o funcionamento da placa AD/DA
float FREQHZ;
float VADPP;
int contador; //Contador que controla a onda quadrada
int sinal; // Sinal da onda quadrada
int count=0;
#ifdef AIO
static int AIO_port_base=0x0300; //Se zero a base sera lida do arquivo .h
#endif
#ifdef DAS1600
static int das1601_port_base=0; //Se zero a base sera lida do arquivo .h
#endif
void *lei_controle(void *t)
{
while (1) {
if (count 100) //rotina para teste
{
//rtl_printf("Lei de controle Chamada,count= %i\n",count);
count = count+1;
}
#ifdef DAS1600
valor = ( (inb(AD0) 0x0F0) 4 | ((inb(AD1) 0x0FF) 4)); // Aquisicao da
posicao
tensao = ((float) (valor - AD_POL))*escala;
#endif
#ifdef AIO
valor = ( (inb(AD0) 0x0FF) | ((inb(AD1) 0x00F) 8)); // Aquisicao da posicao
tensao = ((float) (valor - AD_POL))*escala;
#endif
// Rotina para gerar a onda quadrada
if (contador ONDA_QUADRADA2 contador = ONDA_QUADRADA) // Gera um onda
quadrada ou retangular?
sinal = -1;
else if (contador ONDA_QUADRADA) {
sinal = 1;
contador=0;
}
contador++;
// Lei de controle
ref = PID.ref + PID.sw_amplitud*sinal; // A referencia eh uma
[rtl] Raceway/Gbit Ethernet from Linux
Anyone out there doing Raceway interface under Linux or specifically RTL? On VME ( and mezzanine cards) or PCI/cPCI? Hardware recommendations or known driver support? Hope this isn't off-thread too far? Regards, Mike Cravens -- Alcatel USA Internet: [EMAIL PROTECTED] 1000 Coit Road Plano, Texas 75075 The opinions expressed are not those of DSC Communications, Inc "Keep things as simple as possible, but no simpler". A. Einstein begin:vcard n:cravens;mike tel;home:(972) 423-9463 tel;work:(972) 477-7077 x-mozilla-html:TRUE adr:;;1000 Coit Rd;Plano;Tx;75075;USA version:2.1 email;internet:[EMAIL PROTECTED] title:Senior Software Engineer x-mozilla-cpt:;-10560 fn:[EMAIL PROTECTED] end:vcard
[rtl] Real-time networking
Another question for a group with real-time insight: If I want to stream packet data from a high bandwidth parallel interface like Raceway coupled through hardware fifos onto gigabit ethernet, possibly to be consumed by Unix workstations, then what could give me optimum streaming: (1) Running something in RTL at both ends ( 2) Something in RTL at the Raceway/ ehternet conversion end (3) Something in RTL at the workstation consumer/ data processing/display end. Also, what are the design tradeoffs betweek shared RAMand RTLFIFOS? My own cicular buffers in shared RAM? Thanks for any insight as to how to approach or even quantify the relative performance, boh best/worst case, and typical. Regards, Mike Cravens -- Alcatel USA Internet: [EMAIL PROTECTED] 1000 Coit Road Plano, Texas 75075 The opinions expressed are not those of DSC Communications, Inc "Keep things as simple as possible, but no simpler". A. Einstein begin:vcard n:cravens;mike tel;home:(972) 423-9463 tel;work:(972) 477-7077 x-mozilla-html:TRUE adr:;;1000 Coit Rd;Plano;Tx;75075;USA version:2.1 email;internet:[EMAIL PROTECTED] title:Senior Software Engineer x-mozilla-cpt:;-10560 fn:[EMAIL PROTECTED] end:vcard
[rtl] USING STI/CLI pporach for benchmarking
This may be a sensitive issue, what with S/Wpatents and the like, but what public information is there about using the RTL approach to get precise performance measurements of either soft real time or hard real time performance. This could be in conjunction with a code instrumentation approach or without it. Any interesting performance measuring example code out there? Trace code? Code coverage? Regards, Mike Cravens -- Alcatel USA Internet: [EMAIL PROTECTED] 1000 Coit Road Plano, Texas 75075 The opinions expressed are not those of DSC Communications, Inc "Keep things as simple as possible, but no simpler". A. Einstein begin:vcard n:cravens;mike tel;home:(972) 423-9463 tel;work:(972) 477-7077 x-mozilla-html:TRUE adr:;;1000 Coit Rd;Plano;Tx;75075;USA version:2.1 email;internet:[EMAIL PROTECTED] title:Senior Software Engineer x-mozilla-cpt:;-10560 fn:[EMAIL PROTECTED] end:vcard
Re: [rtl] Soft Real Time
Could you encourage more participation in the porting process by others interested in keeping the source open? If you close the source, I might as well use VxWorks. Many people are just arriving at the real-time and embedded party. Getting people to contribute commits them in ways beyond money and economics. There are some things that die if you hold them too tightly. Our biggest concern where I work is that our vendors of "software" -- usually meaning services -- will not be able to keep up with our demands and we will have to do work here on infrastructure that we would rather someone else provided. Having source is a security blanket that we can pack our own parachute , if need be, but we would rather focus on our areas of expertise as a corporation, and get help in other areas. We have several time " bought " software that we though included a specific port or "Board Support Package", complete with development environments and support contracts, only to be told that the BSP was not a product, just an unsupported example, that the tool chain was now obsolete, and we must change in mid project, and that our support contract did not cover getting responses in finite time, and that all our problems would be solved if we could suddenly sign a consulting agreement. You might want to get your investors to read "Under the Radar, by Red Hat's Robert Young. The part where he was talking to Intel money people about giving away software was both humorous and informative. The project I current work on is an example of why having source is important. We needed a real-time data base package on embedded Linux node, and started with one we have source to for Solaris on Sparc. The port has involved changing some kernel parameters involving things like shared memory, buffer queue depth, semaphores, etc. In modifying these things, I was concerned about inducing inefficiency or bugs. Reading kernel source led me to see the implications of our changes and the limits on them; I also found a latent kernel source bug in how message related parameters are defined that would be catastrophic in our case while not affecting users with short queue depths. So I have avoided having my (legal) change break existing code, and saved a full design cycle over just having header information, etc. Also, our project started on a closed X86 Unix which required long cycle times through the vendor to change anything. We cannot meet our schedules and go through that [extended] hoops that they require to effect change. So all our embedded nodes now run O/S's for which we have source. Regards, Mike [EMAIL PROTECTED] wrote: On Sun, Jun 25, 2000 at 10:49:11PM +0200, Bernhard Kuhn wrote: > [EMAIL PROTECTED] wrote: > > > > We have an experimental RTL V3 with an option to turn off Linux > > on one PC. Measured latencies are very low -- but this is early code. > > If you are interested in testing please send email to me. > > Very interessting! > > Id like to have a look at it, because i intend to > modify the kernel-scheduler in the following way > (if i ever have enough time to do so :-) ) > > o user-spaces processes, kernel-threads and linux-interrupts > should be fixable to specific CPUs. Ingo did Linux interrupts already for 2.3 x86. The others should be easy. BTW: We are under enormous pressure from potential funders who argue that we need to abandon open source entirely to keep Lineo from simply riding us down. I expect RTAI in the future will have done PPC ports before RTLinux and etc. I'm attempting to manouver around both this problem and funder demands. We will see. > o Additionaly to the usual time-sharing "nice-value", a > priority is assigned to user-space processes, resulting > in somewhat i would call a "hierarchical priority encoded > preemptiv time sharing scheduler" :-) I have a solution to this, but [see above] > This surely wouldnt apply to machine control systems, but > is intended for multimedia (happy fragging!) ... i know > that there are several other projects out there, that care > especialy about the second point (red linux, qlinux), > but AFAIK, nobody cares about the first one ... RedLinux contains RTLinux 0.9 code, I don't know the others. But [see above] > > BTW: how was you talk in San Jose? Packed. Very interesting. -- - Victor Yodaiken FSMLabs: www.fsmlabs.com www.rtlinux.com FSMLabs is a servicemark and a service of VJY Associates L.L.C, New Mexico. -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email>" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/ -- Alcatel USA Internet: [EMAIL PROTECTED] 1000 Coit Road Plano, Texas 75075 The opinions expressed are not those of DSC Communications, Inc "Keep things as simple as possible, but no simpler". A. Einstein begin:vcard n:cravens;mike tel;home:(972) 423-9463 tel;work:(972)
Re: [rtl] hrtime_t - int
---On Mon, Jun 26, 2000 at 09:22:44AM -0500, Cory Papenfuss wrote: I've (sorta) figured it out. The int must first be cast as a long long or the multiplication will overflow, but when I tried putting a division in a rt-space function to return miliseconds since boot, I get ./init.o: unresolved symbol __divdi3 when I try to load up my init.o module. Is the access of the longlong division forbidden within rt-space? I ran into this problem a while back __divdi3 is in a library not linked to the kernel. My solution for dividing a 54bit by a 32bit was to copy /usr/src/linux/arch/i386/math-emu/div_small.S to my local dir and include it in my module. --re: Re: [rtl] hrtime_t - int Chris #include stddisclaimer.h Christopher R. Hawks Software Engineer Syscon Plantstar a Division of Syscon International [EMAIL PROTECTED] Computers are like air-conditioners: They stop working properly when you open windows. Linux: The OS for people with an IQ over 98 -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
[rtl] Weird compilation problem while including sys/io.h, who helps?
I have gcc version 2.95.3 (shipped with mandrake 7.1),
when I try to compile a file which includes sys/io.h I get strange
problems:
the c-code
=
#include sys/io.h
void main(void)
{
;
}
=
g++ file.c
result:
In file included from file.c:
/usr/include/sys/io.h: In function "void outl(unsigned int, short unsigned
int)":
/usr/include/sys/io.h:125:parse error before "::"
the piece of code in io.h:
122:extern inline void
123:outl(unsigned short value, unsigned short port)
124:{
125: __asm__ __volatile__ ("outl %0, %w1::"a" (value),
"Nd" (port));
126:}
=
Can anybody tell me whats wrong, it is a standard include file?
Regards
Bert
[rtl] ANNOUNCE: RTiC-Lab/COMEDI interface
Folks, By popular demand, there is now an interface available that allows RTiC-Lab to use all the drivers available for COMEDI. This interface has been graciously submitted by a href="mailto:[EMAIL PROTECTED]"Jose Guilberto/a as a set of RTiC-Lab "drivers". The RTiC-Lab/COMEDI interface may be found in the RTiC-Lab home site: http://128.143.47.231/~efh4v/rtic-lab.html -- Edgar -- Edgar F. Hilton email: [EMAIL PROTECTED] office#: (804) 924-6233 fax#: (804) 982-2246 http://www.people.virginia.edu/~efh4v -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] Soft Real Time
On Mon, Jun 26, 2000 at 01:18:21PM -0500, Mike Cravens wrote: Could you encourage more participation in the porting process by others interested in keeping the source open? If you close the source, I might as well use VxWorks. I am not closing the source. Please note that there are new GPL releases of RTLinux on our web site nearly every week. We have a long track record of delivering GPL code. Longer than anyone else in this area, by some years. Many people are just arriving at the real-time and embedded party. Getting people to contribute commits them in ways beyond money and economics. There are some things that die if you hold them too tightly. Contributed source and ports are great. Please send 'em. What we've found is that most RTLinux users want to work on their own apps. RT kernel code is really specialized. If you look at the credits file sent with RTLinux, you will see that there are some exceptions -- and I, for one, really appreciate them. Tomasz, Jerry, and others have been critical. What I have rejected, and will continue to reject are changes that I think are technically wrong, poorly done, or violate the base paradigm. An advantage of open source is that others who disagree are free to pursue their own path. And if their ideas turn out to be good, we may even change our minds. A good example of how this works is the Linux fbcon component that came after a conceptually similar but weak alternate method was rejected. Having source is a security blanket that we can pack our own parachute , if need be, but we would rather focus on our areas of expertise as a corporation, and get help in other areas. Of course. The commercial advantage of Linux/Open-Source is exactly this: the balance of power shifts from the controlling closed source vendor. Our customers have the advantage of being able to get support from someone else, or do some work internally, or ... This means we have to deliver or get replaced, and we don't mind that bargain at all. However, because customers now have more power, they have to be careful to think things through and decide on the implications of choosing one vendor over another. For example, paying a vendor for a product delivered by Debian, while not putting any money back into Debian may be a self-defeating strategy. You might want to get your investors to read "Under the Radar, by Red Hat's Robert Young. The part where he was talking to Intel money people about giving away software was both humorous and informative. When RedHat (or Heinz ketchup!) posts a profit this will be a more persuasive argument. I don't want to overemphasize the difficulties. We are still having a good time here -- and we are breaking even. But even a calm, easygoing, person like myself can lose his temper now and then. And at ELC, I talked to a potential investor who asked me precisely this question inspired by talks in which Debian invented technology was being advertised as proprietary. A somewhat grumpy, low-sleep email followed. Don't read too much into it. -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
Re: [rtl] RTAI Vs RTLinux
[EMAIL PROTECTED] wrote: RTLinux is in the default PowerPC Linux kernel in development versions. Given your previous record, I must admit that this is quite an unfortunate event! I'm siding with Paolo on this one and hope that most people reading this do take a very serious look at RTAI. In my opinion, it far outdoes anything RTLinux can ever do (plus, it doesn't need to employ Microsoft-like tricks to innovate). My 2$ === Karim Yaghmour [EMAIL PROTECTED] Operating System Consultant (Linux kernel, real-time and distributed systems) === -- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl Your_email" | mail [EMAIL PROTECTED] --- For more information on Real-Time Linux see: http://www.rtlinux.org/rtlinux/
[rtl] realtime OS
Dear all: I have two questions about the realtime OS. 1. Are there any articles talking about the comparison of the realtime OS in the markets? 2. How can we evaluate the performance of a realtime OS, such as the rtlinux? Thanks for your help! Wish you have a nice day!--Meng-Hong ChenDeptartment of Electrical EngineeringTamKang UniversityE-mail : [EMAIL PROTECTED]Tel : 886-2-26215656 ext. 2102
