Re: [Xenomai] x86 Linux with xenomai and i915 graphics stall

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On 01/24/2013 11:22 PM, Daniel M. Drucker, Ph.D. wrote:

> Hi Gilles et al.,
> 
> We tried setting processor type more correctly, turning off CONFIG_M686
> and turning on CONFIG_MCORE2, and also turned off CONFIG_X86_GENERIC.
> 
> That change has caused our worst latencies to drop to around 200us, but
> those are actually rare - we can only [but reliably] trigger that by
> using glxgears with a very large (1200x700 or larger or so) window size.
> (Other things we tried had no latency-increasing effects - we tried
> heavy disk and network activity, playing youtube videos, etc.)''
> 
> /proc/ipipe/trace/frozen, without glxgears running: http://ix.io/46I
> with glxgears running: http://ix.io/46J


It would be interesting to know what happens on other cpus at the time
when this happens. Or could you try forcing glxgears to run on the same
CPU as the latency test?

> 
> Log of latency: http://ix.io/46L
> 
> And.... here is a video of the
> problem: http://www.youtube.com/watch?v=l4rYvhqZql8
>  (problem starts at about 0:41)
> 
> Can you think of anything else we could try? We've tried enabling SMI


Yes, but did you run dmesg | grep SMI to see if your chipset is acutally
supported?

Have you tried to turn off graphic acceleration in X window configuration?

-- 
                                                                Gilles.