quikcjack！
Oh, thanks! I will try to get it later. I had allways use email to read
this board,
since I am form mainland China and can't access this board form web page. :-(
Any way, thansk for your work and help.
2014-04-04 23:08:32 您在来信中写道：
Sorry for my late answer. I
Sorry for my late answer. I have posted my kernel configuration on March 5.
Please take a close look at my postings. You mave have to log in to google
to see the attachments.
Am Mittwoch, 19. März 2014 16:06:07 UTC+1 schrieb winglion:
hi,quikcjack. I had been fallowing the topic for
It's really nice to see that there is some interest in having a
PREEMPT/PREEMPT_RT capable kernel for the BBB.
Well, it's relatively easy to compile a kernel. If you want to develop
applications for the BBB you need a compiler/toolchain. So I guess you
might have that already. The instructions
hi,quikcjack. I had been fallowing the topic for some dates.
I plan to build a CNC controler with BBBlack.
I want to get your kernel config to make a PREEMPT/PREEMPT_RT capable kernel
too.
whould you please seem me your kernel confiuration too? Thanks.
2014-03-19 16:47:58 ：
Hi thats great!
Is that possible to have your compiled kernel for BBB? I would avoid the
compiling process.
Thanks a lot,
Morteza
Am Mittwoch, 26. Februar 2014 14:53:05 UTC+1 schrieb quik...@gmail.com:
I have recently tested kernel 3.8.13-rt9 (
I have never heard of a PREEMPT_RT capable kernel for the BBB besides that
from OSADL. I have recently had a conversation with Robert C. Nelson. He
told me, that kernel 3.8 has problems and did never support PREEMPT_RT. The
3.8-rt branch is no longer in development. Officially, the BBB does not
I tried PREEMPT yesterday on 3.12.9 and the ethernet seemed to work. The
only thing I had a problem with was USB host.
It failed the probe().
So I reverted. Years ago I filed a bug report with TI regarding the
ethernet driver not working with PREEMPT in kernel 3.2.
Some progress has been
I have lately also unsuccessfully tried to install RT_PREEMPT on BBB.
What I have done until now (and failed) is:
A.
1. Get the sources from here:
https://github.com/beagleboard/kernel/tree/3.8-rt
2. Before make command, enable Full Preemption under kernel features
options.
3.
Hi ,all. I had been reading this thread of PREEMPT_RT for a few days.
(I miss the starting mails since I can't get to the web page of google groups)
For my situation, I just need my userspace program run once every 1ms sys tick.
The result will be writed to a fifo in FPGA to achive
Thanks for you tips. I am using a minimal Ubuntu system without a full
desktop that is based on
http://www.armhf.com/index.php/boards/beaglebone-black/#precise. I used
apt-get to update the system. The integrated eMMC and HDMI are deactivated.
To create a network stress I used Ubuntu's iperf
Interesting result. Would be nice to see a histogram. I will try and
duplicate this measurement. Also doing the some measure with the standard
kernel would be informative.
That upper tail of 132 is a big problem for me.
On Thursday, February 27, 2014 12:53:05 AM UTC+11, quik...@gmail.com
I have recently tested kernel 3.8.13-rt9 (
https://github.com/beagleboard/kernel/tree/3.8-rt) using
git://git.kernel.org/pub/scm/linux/kernel/git/clrkwllms/rt-tests.git. I am
using Ubuntu 12.04.4. The load was created using stress –cpu 1 which
generates a cpu load of about 100%. I then used
Those are pretty good numbers. Did you have heavy network and disk
(uSD/eMMC) load going as well? IIRC, the uSD/eMMC driver was
responsible for the worst of the latency spikes I saw, but that's been
some time ago and based on the OMAP kernel list traffic, it appears
there have been lots of
The stress tool generates cpu load only. But it is a good idea to consider
other load scenarios, too. The current test was done using ssh so there was
at least some network activity. Do you know of a good test tool which
allows to generate disk and network load?
Am Mittwoch, 26. Februar 2014
Xenomai includes a dohell script that can generate disk and network
load. You can always just dd to a file for a while.
If you're running a Debian/Ubuntu based system, I've found that running
aptitude upgrade if you have a few dated packages can be a major
stress to the system. That gets you
:
Date: Sunday, February 23, 2014 at 3:26 AM
To: beagl...@googlegroups.com javascript:
Cc: rchrd...@gmail.com javascript:
Subject: [beagleboard] Re: BBB + PREEMPT_RT
Hi,
On Saturday, February 22, 2014 2:17:24 PM UTC+2, rchrd...@gmail.com wrote:
Just a few thoughts ...
It is not possible
Hi,
On Saturday, February 22, 2014 2:17:24 PM UTC+2, rchrd...@gmail.com wrote:
Just a few thoughts ...
It is not possible to have a fully deterministic real-time operating
system on a processor that uses instruction/data caches. ie you have to
turn off the cacheing to achieve determinism
Hi,
On Saturday, February 22, 2014 1:17:24 PM UTC+1, rchrd...@gmail.com wrote:
It is not possible to have a fully deterministic real-time operating
system on a processor that uses instruction/data caches. ie you have to
turn off the cacheing to achieve determinism and eliminate performance
From: robert.berger robert.karl.ber...@gmail.com
Reply-To: beagleboard@googlegroups.com
Date: Sunday, February 23, 2014 at 3:26 AM
To: beagleboard@googlegroups.com
Cc: rchrdly...@gmail.com
Subject: [beagleboard] Re: BBB + PREEMPT_RT
Hi,
On Saturday, February 22, 2014 2:17:24 PM UTC+2
To: beagleboard@googlegroups.com
Cc: rchrdly...@gmail.com
Subject: [beagleboard] Re: BBB + PREEMPT_RT
Hi,
On Saturday, February 22, 2014 2:17:24 PM UTC+2, rchrd...@gmail.com wrote:
Just a few thoughts ...
It is not possible to have a fully deterministic real-time operating
system on a processor
From: Daniel Nilsson dan...@dnil.se
Reply-To: beagleboard@googlegroups.com
Date: Sunday, February 23, 2014 at 1:19 PM
To: beagleboard@googlegroups.com
Subject: Re: [beagleboard] Re: BBB + PREEMPT_RT
Hi,
For those interested in what the BBB can do in terms of interrupt latencies
Just a few thoughts ...
It is not possible to have a fully deterministic real-time operating system
on a processor that uses instruction/data caches. ie you have to turn off
the cacheing to achieve determinism and eliminate performance jitter (which
then degrades the average performance).
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