From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sitsofe Wheeler <sitsofe@yahoo.com>
Subject: Re: Interrupt latency on some 945GM platforms
Date: Tue, 14 Sep 2010 23:41:11 +0100
Message-ID: <20100914224111.GA14467@sucs.org>
References: <201009132336.17310.anarsoul@gmail.com> <201009141109.41596.anarsoul@gmail.com> <alpine.LFD.2.00.1009141149380.2416@localhost6.localdomain6> <201009141529.53179.anarsoul@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
To: Vasily Khoruzhick <anarsoul@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, Venkatesh Pallipadi <venki@google.com>, Jesse Barnes <jbarnes@virtuousgeek.org>, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org
List-Id: intel-gfx@lists.freedesktop.org

On Tue, Sep 14, 2010 at 03:29:48PM +0300, Vasily Khoruzhick wrote:
> =D0=92 =D1=81=D0=BE=D0=BE=D0=B1=D1=89=D0=B5=D0=BD=D0=B8=D0=B8 =D0=BE=D1=
=82 14 of September 2010 12:52:57 =D0=B0=D0=B2=D1=82=D0=BE=D1=80 Thomas=
 Gleixner =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB:
> > Can you try with NOHZ enabled and the following on the kernel comma=
nd line:
> >=20
> >     processor.max_cstate=3D1
>=20
> It works in this case (gears in glxgears move smoothly)
> =20
> > If that works, then try
> >=20
> >     processor.max_cstate=3D2
> >=20
>=20
> Nope, it doesn't work with max_cstate=3D2

Perhaps intel_idle is being used? Any mention of it in dmesg?

--=20
Sitsofe | http://sucs.org/~sits/