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

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Message-ID: <20100924114122.4bfce00e@jbarnes-desktop>
Date:	Fri, 24 Sep 2010 11:41:22 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Vasily Khoruzhick <anarsoul@...il.com>
Cc:	Sitsofe Wheeler <sitsofe@...oo.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Venkatesh Pallipadi <venki@...gle.com>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: Interrupt latency on some 945GM platforms

On Thu, 16 Sep 2010 18:03:04 +0300
Vasily Khoruzhick <anarsoul@...il.com> wrote:

> В сообщении от 15 of September 2010 01:41:11 автор Sitsofe Wheeler написал:
> > > >     processor.max_cstate=2
> > > 
> > > Nope, it doesn't work with max_cstate=2
> > 
> > Perhaps intel_idle is being used? Any mention of it in dmesg?
> 
> Sitsofe, maybe you misunderstood me, I mean with max_cstate=1 graphics is 
> smooth, with higher values (i.e. max_cstate=2) graphics is jerky.
> 
> Btw, Jesse, any comments/solutions/workarounds except one with 
> processor.max_cstate=1 in kernel commandline? Should I file a bug on fdo 
> bugzilla?

FDO bug for this is https://bugs.freedesktop.org/show_bug.cgi?id=30364.

I still don't have a root cause, but at least we have a workaround.

-- 
Jesse Barnes, Intel Open Source Technology Center
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