linux-kernel - Re: Interrupt latency on some 945GM platforms

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Message-Id: <201009242248.36554.anarsoul@gmail.com>
Date:	Fri, 24 Sep 2010 22:48:36 +0300
From:	Vasily Khoruzhick <anarsoul@...il.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Sitsofe Wheeler <sitsofe@...oo.com>,
	Venkatesh Pallipadi <venki@...gle.com>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Len Brown <lenb@...nel.org>
Subject: Re: Interrupt latency on some 945GM platforms

On 24 of September 2010 22:39:01 Jesse Barnes wrote:
> On Thu, 16 Sep 2010 23:06:46 +0300
> 
> Vasily Khoruzhick <anarsoul@...il.com> wrote:
> > В сообщении от 16 of September 2010 21:50:50 автор Thomas Gleixner 
написал:
> > > Ok. The problematic part of HPET was not the clocksource, it was the
> > > clock event device which failed to deliver interrupts occasionally. It
> > > was worth a try at least.
> > 
> > Hm, it seems that jerky glxgears is not related to jerky keyboard events.
> > Keyboard is jerky only in konsole (kde terminal emulator), it seems
> > something happened it seems that font rendering performance is much
> > worse in latest xf86-video-intel than in xf86-video-intel-2.12.0.
> 
> Len just had me try a few things too:
>   - maxcpus=1 lets things work
>   - offlining cpu1 at runtime (echo 0
> 
>     > /sys/devices/system/cpu/cpu1/online) lets things work
> 
>   - binding the i915 interrupt to cpu 0 does *not* help
> 
> Vasily and Paolo, do you both have Atom CPUs with hyperthreading
> enabled?

Nope, I have Core2Duo T5500, dual-core, no hyperthreading :)
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