From mboxrd@z Thu Jan  1 00:00:00 1970
From: Krzysztof =?UTF-8?Q?B=C5=82aszkowski?= <kb@domain.hid>
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Date: Fri, 20 Aug 2010 18:20:52 +0200
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Subject: Re: [Xenomai-core] rt timer jitter
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To: Philippe Gerum <rpm@xenomai.org>
Cc: xenomai@xenomai.org

On Fri, 2010-08-20 at 18:06 +0200, Philippe Gerum wrote:
> On Fri, 2010-08-20 at 17:55 +0200, Krzysztof Błaszkowski wrote:
> > Do you have any idea about reducing rt timer jitter ?
> > I experience annoyingly big jitter in a thread which is supposed to run
> > at 400us (i reckon this is nothing extra demanding from atom @1.6G)
> > 
> > 
> > the thread's loop looks like:
> > 
> > {
> > function1()
> > ..2()
> > ..3()
> > ..4()
> > 
> > rt_task_wait_period()
> > }
> > 
> > (^yet another simplified model^)
> 
> This is the typical pattern of the latency test. What figures do you get
> with:
> 
> # /usr/xenomai/bin/latency -t0
> ...
> # /usr/xenomai/bin/latency -t1
> 

t0:

RTS|     -1.337|     -0.039|     13.285|       0|     0|
00:02:13/00:02:13


i can't run t1 because of missing seno_timerbench.ko (i have no idea how
to find a config option which would build it)

-- 
Krzysztof Blaszkowski