Re: Replace two ioread32 with ioread64_lo_hi non_atomic

On Mon, Apr 25, 2022 at 1:32 PM Philipp Hortmann < philipp.g.hortm...@gmail.com> wrote: > Hi, > > in this patch: > [PATCH 4/5] staging: vt6655: Replace two VNSvInPortD with ioread64_lo_hi > > I tried to combine two reads in one. > > if (ww == W_MAX_TIMEOUT) > return false;

Re: how to debug problem with "failing unmounting"

On Thu, Jul 9, 2020 at 5:24 AM Tomek The Messenger < tomekthemessen...@gmail.com> wrote: > Hi > On the soc on which I work there is issue with unmouting some > partitions/directories during /sbin/reboot, here is some example: > > [ OK ] Stopped target Local File System. > Unmouting Temporary

Re: Kernel Module with multiple source files not initializing

On Fri, Oct 25, 2019 at 2:16 AM Irfan Ullah (울라 이르판) wrote: > Dear All, > I have developed a kernel module consists of one source file that sends > and receives message to the user space. I have spitted the source code in > two files, and now I am trying to develop kernel module from these sou

Re: WOL from S5 (shutdown)

any pointers? On Fri, Jul 26, 2019 at 4:56 PM Abu Rasheda wrote: > Hello, > > I understand how the computer running Linux would wake up from USB based > ethernet from S3 (suspend) state. But, I am missing some piece of > information for WOL on USB ethernet from S5 (shutdown). &

WOL from S5 (shutdown)

me out a book or explain? Thanks. Abu Rasheda ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

Re: a Linux device driver

On Tue, Jun 5, 2018 at 2:06 PM, wrote: > On Tue, 05 Jun 2018 13:51:54 -0700, Abu Rasheda said: > > > right now, I am in a mood to write a driver, not testing :) > > Can you, in a few sentences, explain why the Linux community wants a driver > written by somebody who wanted

Re: a Linux device driver

On Tue, Jun 5, 2018 at 1:51 AM, Ozgur Kara wrote: > > > 05.06.2018, 08:57, "valdis.kletni...@vt.edu" : > > On Mon, 04 Jun 2018 15:49:37 -0700, Abu Rasheda said: > > > >> Any recommendations what device driver is missing and open source > >> com

a Linux device driver

Hello, I am an experienced Linux kernel and driver developer and have some time! I like to develop a driver for Linux open source. Any recommendations what device driver is missing and open source community could benefit from a new driver or enhance some existing driver? Where could I go for suc

Re: using SD card on Broadcom 4709 eval board

On Sun, Nov 23, 2014 at 3:09 AM, Paul Bolle wrote: > The "depends on" line you quoted was added in v2.6.32, which is still > supported, so the tree you're using might not be seen as "extremely old" > by everyone. I think it i 3.6.3x where x is I think 4 > The above is a verbose way to admit that

Re: using SD card on Broadcom 4709 eval board

> > > depends on B43 && SSB_SDIOHOST_POSSIBLE && EXPERIMENTAL, > > EXPERIMENTAL was removed in v3.9. So this concerns a pre-v3.9 tree? > Yes, it is 2.6 kernel. I know this is extremely old.I just want to have SD card working, any suggestions ? > off the above B43 is only shows up in arch/ppc, >

using SD card on Broadcom 4709 eval board

I have been trying to use SD card on Broadcom's 4709 eval board. Linux kernel tree provided with SDK seems to have few SDIO drivers, but non of them seems to be working or more accurately, loading them does not list device in /proc/devices, so I can create block file to mount it. After googling an

Re: Writing kernel in C

> > > 1. It called TempOS. It is a kernel for educational purpose too. http://tempos-project.org The project is listed in OSDev Wiki too http://wiki.osdev.org/Projects 2. Here's another nice one: https://fosdem.org/2014/schedule/event/04_uk_escape 3. take a look at that [0], it's a small u

Re: how tso (tcp segmentation offload) effect TCP bidirectional test sending throughput.

On Fri, Apr 11, 2014 at 3:10 AM, Varun Sharma wrote: > Hi, > > if we off tso (tcp segmentation offload) on sending side , *TCP > Bidirectional* test sending throughput decrease as compare to *TCP > Unidirectional *test sending throughput . > > whereas if we on tso(tcp segmentation offload) on se

Re: Non-consistent CPU usage in IP forwarding test

On Thursday, April 3, 2014, Oleg A. Arkhangelsky wrote: > Hello all, > > We've got very strange behavior when testing IP packet forwarding > performance > on Sandy Bridge platform (Supermicro X9DRH with the latest BIOS). This is > two > socket E5-2690 CPU system. Using different PC we're generati

Re: using perf tool

compiled kernel module on this machine, perf can get path from the binary and locate the source. enjoy. On Fri, Dec 6, 2013 at 7:14 PM, Abu Rasheda wrote: > Guys, > > I want to annotate Linux kernel module with c-source using perf tool. > Is it possible ? can someone points me to the instruc

using perf tool

Guys, I want to annotate Linux kernel module with c-source using perf tool. Is it possible ? can someone points me to the instructions how to do this ? Thanks ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org

Re: module vs main kernel

wrote: I have my implementation of socket APIs, I sock_unregister(AF_INET); & sock_register(&inet_family_ops), this replaces kernel resident socket related calls with my socket related calls. My code is loaded as kernel module. My question, is Linux kernel

module vs main kernel

I have my implementation of socket APIs, I sock_unregister(AF_INET); & sock_register(&inet_family_ops), this replaces kernel resident socket related calls with my socket related calls. My code is loaded as kernel module. My question, is Linux kernel able to call its own socket call more efficient

Re: How to avoid packet drop

> I am running a tool that is a packet generator. > With that tool i am able to achieve line/link rate on my 1Gbps network. > I have two queries > > Query 1) When i run the same tool on 10Gbps network i am able to achieve > only 5Gbps rate.( by network i mean i have two machines with Centos 6.4 > c

Re: valid address space ?

On Sun, Feb 24, 2013 at 11:23 PM, wrote: > On Sun, 24 Feb 2013 21:37:48 -0800, Abu Rasheda said: > > >tmp_long_ptr = ((long_ptr & 0x8000) ? (long_ptr | > > 0x8000) : (long_ptr & 0x)); > > This will not do what you think it

Re: valid address space ?

On Sunday, February 24, 2013, Abu Rasheda wrote: > I am trying to dump some kernel data structure (walk e.g. task or file > data structure on x86_64 arch). Sometime accessing through a pointer, > pointer may not be NULL, but pointing to invalid address due to garbage > value. &

valid address space ?

I am trying to dump some kernel data structure (walk e.g. task or file data structure on x86_64 arch). Sometime accessing through a pointer, pointer may not be NULL, but pointing to invalid address due to garbage value. What I am looking for is range of address which are valid for kernel data str

Re: How the follow Starts in Android-Kernel

On Tue, Feb 5, 2013 ... http://www.linux-arm.org/LinuxBootLoader/SMPBoot > > > for i86 http://duartes.org/gustavo/blog/post/how-computers-boot-up Does something similar exist for MIPS ? Thanks ___

Re: Any way to do time keeping during kernel uncompression[ARM architecture]

On Wed, Feb 6, 2013 at 3:53 AM, sandeep kumar wrote: > Dear All > FYI: > I got the below data in my board... > For Zimage: > Copy from eMMC to RAM(bootloader) & other stuff in bootloader -- 200msec > Kernel relocation --- 1msec > Kernel uncompression -- 700msec > Total time taken --- 900msec appro

Re: Module vs Kernel main performacne

I modified my module (m.c). Still sending buffer from user space using ioctl, but instead of copying data from buffer provided by user, I have allocated (kmalloc) a buffer and I copy from this buffer to another kernel buffer which is allocated each time this module ioclt is invoked. copy_from_user

Re: Module vs Kernel main performacne

wrote: > Hi again! > Hi > How did you call from Kernel module? In original code, copied data is dmaed and in experimental code data is dropped. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/li

Re: Module vs Kernel main performacne

> > Hello Abu, > > I had to include or an error was issued about > "THIS_MODULE". > I am running this tool on Scientific Linux 6.0, which is 2.6.32 kernel. I know this is old but this is what I have for my product. > What Kernel version are you using? I'm trying to compile it and I'm > getting

Re: Module vs Kernel main performacne

come to try and explain the behavior. Abu Rasheda m.tgz Description: GNU Zip compressed data ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

Re: Module vs Kernel main performacne

On Wed, May 30, 2012 at 10:35 PM, Mulyadi Santosa wrote: > Hi... > > On Thu, May 31, 2012 at 4:44 AM, Abu Rasheda wrote: >> as I increase size of buffer, insns per cycle keep decreasing. Here is the >> data: >> >>    1k 0.90  insns per cycle >>    8k 0.

Re: Module vs Kernel main performacne

On Wed, May 30, 2012 at 2:44 PM, Abu Rasheda wrote: > I did another experiment. > > Wrote a stand alone module and user program which does ioctl and pass > buffer to kernel module. > > User program passes a buffer through ioctl and kernel module does > kmalloc on it and

Re: Module vs Kernel main performacne

I did another experiment. Wrote a stand alone module and user program which does ioctl and pass buffer to kernel module. User program passes a buffer through ioctl and kernel module does kmalloc on it and calls copy_from_user, kfree and return. Test program send 120 gigabyte data to module. If I

Re: Module vs Kernel main performacne

> What I meant here is, there must be difference speed when you copy > onto something contigous vs non contigous. IIRC at least it will waste > some portion of L1/L2 cache. When you say, LKM area is prepared with vmalloc is it for code / executable you refering too ? if so will it matter for data

Module vs Kernel main performacne

Hi, I am working on x8_64 arch. Profiled (oprofile) Linux kernel module and notice that whole lot of cycles are spent in copy_from_user call. I compared same flow from kernel proper and noticed that for more data through put cycles spent in copy_from_user are much less. Kernel proper has 1/8 cycle

Re: Kernel latency for handling the Network traffic

On Thu, May 3, 2012 at 6:54 AM, wrote: > Hi! > > On 16:33 Thu 03 May     , Suresh Kumar Subramanian wrote: >> Hi, >> >> I am building the router based on linux kernel. >> >> The hardware details are below, >> 2 - 64 bit quad core processor (3Ghz core). >> RAM-  24GB RAM. >> PCI express slot- conne

Linux kernel networking stack

I want to embark on journey of learning Linux networking stack. I want suggestions, what is best way to do this. Any book recommendation, any documentation which might exist. Thanks. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://

Re: Debugging IP packet through Linux stack

> > On Wed, Sep 21, 2011 at 10:26 PM, Abu Rasheda > wrote: > I am inserting packets into Linux stack and they are accepted by > net_rx function, but are latter dropped. What tools are available in Linux > kernel to for debugging this issue. > I discovered that /proc/net/snmp

Debugging IP packet through Linux stack

I am inserting packets into Linux stack and they are accepted by net_rx function, but are latter dropped. What tools are available in Linux kernel to for debugging this issue. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.ker

Re: kallsyms_lookup_name

> > - grep kallsyms_lookup from /proc/kallsyms (it is there on SL 5.5 and SL >> 6.0. You can edit your program and assign something like: >> >> int (*my_kallsyms_lookup_name)(const char *name) = (void *) KALLSYMS; >> >> where KALLSYMS is address found above, or your loading script can feed >> this

Re: kallsyms_lookup_name

On Sat, Aug 6, 2011 at 11:06 AM, Mulyadi Santosa wrote: > On Sat, Aug 6, 2011 at 12:55, Venkatram Tummala > wrote: > > Hi, > > > > I need to use some unexported kernel symbols in my kernel module but in > the > > particular kernel version i am based on (2.6.18 - RHEL 5.7), > > kallsyms_lookup_nam

Re: Compiling kernel module ...

> Get the code merged upstream so you never have to worry about it again. > Greg, my issue is basic. I am talking about change in parameter .create of net_proto_family struct. It seems that Scientific Linux had it back ported. ___ Kernelnewbies mailing

Re: Compiling kernel module ...

On Fri, Aug 5, 2011 at 5:10 PM, Akash wrote: > Use #if like > * > *#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) > > #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 33) >// New socket create function > #else >// Old socket create function > #endif > > LINUX

Compiling kernel module ...

I am compiling my driver and have run into following scenario. Socket create function got a new parameter in Vanila kenrel 2.6.33. while Scientific Linux has it back ported to 2.6.32. How do I handle this kind of situation ? so that my driver compiles for both kernel versions.

Re: Linux kernel test suites

Thank to all of you who replied. I will check these out. Abu Rasheda On Sun, May 22, 2011 at 9:40 PM, sanjeev sharma wrote: > Hey, > > You can refer Autotest. > > Thanks > Sanjeev sharma > > On Sat, May 21, 2011 at 5:03 AM, Abu Rasheda wrote: >> >> Can som

Linux kernel test suites

Can someone pass me pointer to Linux kernel test suite ? I am specially interested in iptables (netfilter) and socket APIs. Thanks ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbi

Fwd: Sleep and Wake up

> >> I am testing my driver on much faster host processor and facing > >> following issues: > >> > >> My host is too powerful and it can fill up device buffer queue very fast. > > > > What kind of device is this? > >> its a networking device >It sounds like a broken device, you need to be able to

Re: Sleep and Wake up

On Mon, May 2, 2011 at 12:28 PM, Greg KH wrote: > On Mon, May 02, 2011 at 11:32:32AM -0700, Abu Rasheda wrote: >> I am testing my driver on much faster host processor and facing >> following issues: >> >> My host is too powerful and it can fill up device buffer queue

Sleep and Wake up

I am testing my driver on much faster host processor and facing following issues: My host is too powerful and it can fill up device buffer queue very fast. I get best performance when I do busy wait, but this is not desirable and is bad design. I need to sleep and wake up quickly and predictabil