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Date: Wed, 1 Jun 2005 10:23:51 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Serge Noiraud <serge.noiraud@bull.net>
Cc: Lee Revell <rlrevell@joe-job.com>,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: RT : 2.6.12rc5 + realtime-preempt-2.6.12-rc5-V0.7.47-15
Message-ID: <20050601082351.GA30690@elte.hu>
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* Serge Noiraud <serge.noiraud@bull.net> wrote:

> Le mar 31/05/2005 à 21:47, Lee Revell a écrit :
> > On Tue, 2005-05-31 at 16:53 +0200, Serge Noiraud wrote:
> > > I have a test program which made a loop in RT to mesure the system
> > > perturbation.
> > > It works finely in a tty environment.
> > > When I run it in an X environment ( xterm ), I get something like if I
> > > click the Enter key in the active window.
> > > If I open a new xterm, this is the new active window which receive these
> > > events.
> > > These events stop when the program stop.
> > > 
> > > I tried with X in RT and no RT : I have the problem.
> > 
> > Try adding:
> > 
> > Option "NoAccel"
> Same problem.

could you enable latency timing and tracing in the .config:

 CONFIG_CRITICAL_PREEMPT_TIMING=y
 CONFIG_CRITICAL_IRQSOFF_TIMING=y
 CONFIG_LATENCY_TIMING=y
 CONFIG_LATENCY_TRACE=y

and start a new search for a maximum latency via:

 echo 0 > /proc/sys/kernel/preempt_max_latency

and then do the X test - what is the largest latency reported in 
'dmesg'? Also, please send me a (bzip2 -9 compressed, if too large) 
/proc/latency_trace trace output of the largest incident.

	Ingo