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

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Message-ID: <alpine.LFD.2.00.1009162049450.2416@localhost6.localdomain6>
Date:	Thu, 16 Sep 2010 20:50:50 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Vasily Khoruzhick <anarsoul@...il.com>
cc:	Sitsofe Wheeler <sitsofe@...oo.com>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: Interrupt latency on some 945GM platforms

On Thu, 16 Sep 2010, Vasily Khoruzhick wrote:

> В сообщении от 16 of September 2010 21:30:58 автор Vasily Khoruzhick написал:
> > В сообщении от 16 of September 2010 21:07:39 автор Thomas Gleixner написал:
> > > > Btw, Jesse, any comments/solutions/workarounds except one with
> > > > processor.max_cstate=1 in kernel commandline? Should I file a bug on
> > > > fdo bugzilla?
> > > 
> > > we fixed a HPET related bug a few days ago, which might be the cause
> > > for your problem as well.
> > 
> > Nope, it doesn't help :(
> 
> Btw, I suspect hpet is not related, I disabled hpet completely in kernel 
> config but issue is still here (clocksource is acpi_pm)

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.

Thanks,

	tglx