From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Galbraith Subject: Re: [patch v7 0/21] sched: power aware scheduling Date: Tue, 30 Apr 2013 11:49:40 +0200 Message-ID: <1367315380.4616.91.camel@marge.simpson.net> 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> <20130430084135.GA21473@gmail.com> <1367314539.4616.88.camel@marge.simpson.net> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1367314539.4616.88.camel@marge.simpson.net> Sender: linux-kernel-owner@vger.kernel.org To: Ingo Molnar 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 List-Id: linux-pm@vger.kernel.org On Tue, 2013-04-30 at 11:35 +0200, Mike Galbraith wrote: > On Tue, 2013-04-30 at 10:41 +0200, Ingo Molnar wrote: > > Which are the workloads where 'powersaving' mode hurts workload > > performance measurably? > > Well, it'll lose throughput any time there's parallel execution > potential but it's serialized instead.. using average will inevitably > stack tasks sometimes, but that's its goal. Hackbench shows it. (but that consolidation can be a winner too, and I bet a nickle it would be for a socket sized pgbench run)