From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexey Fisher Subject: Re: [Intel-gfx] [PATCH 4/4] cpuidle: Hack iowait weighting to avoid C-state reduction for graphics. Date: Tue, 02 Nov 2010 21:00:31 +0100 Message-ID: <1288728031.3031.7.camel@zwerg> References: <1288643024-5706-1-git-send-email-eric@anholt.net> <1288643024-5706-5-git-send-email-eric@anholt.net> <1288700414.26046.18.camel@localhost.localdomain> <87fwvj7mvz.fsf@pollan.anholt.net> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <87fwvj7mvz.fsf@pollan.anholt.net> Sender: linux-acpi-owner@vger.kernel.org To: Eric Anholt Cc: ykzhao , linux-acpi@vger.kernel.org, "intel-gfx@lists.freedesktop.org" , arjan@linux.intel.com List-Id: intel-gfx@lists.freedesktop.org Am Dienstag, den 02.11.2010, 08:42 -0700 schrieb Eric Anholt: > On Tue, 02 Nov 2010 20:20:14 +0800, ykzhao wrote: > > On Tue, 2010-11-02 at 04:23 +0800, Eric Anholt wrote: > > > Improves nexuiz performance by about 1% on my system. > > > > CC: Arjan and linux-acpi mailing list. > > > > It seems that the selection of C-state will become very sensitive to IO > > wait after the multi factor is changed from 10 to 1000. > > Maybe only one IO/wait will bring that the system can't enter the deep > > C-state. > > Note the original message that said "This patch series is a hack, if it > helps anyone I'll rewrite it to do the right thing". If this patches about perforamnce issue on 9450gm and sleep state on CPU, than it do not work for me. I applied your patches on the top of 3e7b033 (drm/i915: Use the agp_size determined from the GTT), the 3/4 was rejected so id it manually. Same result: graphic perfomence drop on smp/ht system if cpu in C4. -- Regards, Alexey