Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759601Ab3D3Ilo (ORCPT ); Tue, 30 Apr 2013 04:41:44 -0400 Received: from mail-bk0-f46.google.com ([209.85.214.46]:56998 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759146Ab3D3Ilk (ORCPT ); Tue, 30 Apr 2013 04:41:40 -0400 Date: Tue, 30 Apr 2013 10:41:35 +0200 From: Ingo Molnar To: Mike Galbraith Cc: Len Brown , Borislav Petkov , Alex Shi , mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, akpm@linux-foundation.org, arjan@linux.intel.com, pjt@google.com, namhyung@kernel.org, morten.rasmussen@arm.com, vincent.guittot@linaro.org, gregkh@linuxfoundation.org, preeti@linux.vnet.ibm.com, viresh.kumar@linaro.org, linux-kernel@vger.kernel.org, len.brown@intel.com, rafael.j.wysocki@intel.com, jkosina@suse.cz, clark.williams@gmail.com, tony.luck@intel.com, keescook@chromium.org, mgorman@suse.de, riel@redhat.com, Linux PM list Subject: Re: [patch v7 0/21] sched: power aware scheduling Message-ID: <20130430084135.GA21473@gmail.com> References: <1365040862-8390-1-git-send-email-alex.shi@intel.com> <516724F5.20504@kernel.org> <5167C9FA.8050406@intel.com> <20130412162348.GE2368@pd.tnic> <1365785311.5814.36.camel@marge.simpson.net> <516F19EE.5060309@kernel.org> <1366989087.30242.11.camel@marge.simpson.net> <1367298972.4616.41.camel@marge.simpson.net> <1367310625.4616.71.camel@marge.simpson.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1367310625.4616.71.camel@marge.simpson.net> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 920 Lines: 26 * Mike Galbraith wrote: > On Tue, 2013-04-30 at 07:16 +0200, Mike Galbraith wrote: > > > Well now, that's not exactly what I expected to see for AIM7 compute. > > Filesystem is munching cycles otherwise used for compute when load is > > spread across the whole box vs consolidated. > > So AIM7 compute performance delta boils down to: powersaving stacks > tasks, so they pat single bit of spinning rust sequentially/gently. So AIM7 with real block IO improved, due to sequentiality. Does it improve if AIM7 works on an SSD, or into ramdisk? Which are the workloads where 'powersaving' mode hurts workload performance measurably? Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/