Messages in this thread | | | Date | Tue, 30 Dec 2008 07:21:39 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH v7 0/8] Tunable sched_mc_power_savings=n |
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* Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> > > KERNBENCH Runs: make -j4 on a x86 8 core, dual socket quad core cpu > > > package system > > > > > > SchedMC Run Time Package Idle Energy Power > > > 0 81.68 52.83% 54.71% 1.00x J 1.00y W > > > 1 80.70 36.62% 70.11% 0.95x J 0.96y W > > > 2 74.95 19.53% 85.92% 0.90x J 0.98y W
> > Your result is very interesting. > > level 2 is more fast and efficient of power. > > > > What's major contributor to use less time in level 2? > > I think it's cache bounce is less time than old. > > Is right ? > > Yes, correct
yes, i too noticed that runtime improved so dramatically: +7.5% on kernbench is a _very_ big deal.
So i wanted to ask you to re-test whether this speedup is reproducible, and if yes, please check a few other workloads (for example sysbench on postgresql / mysqld) and send a patch that changes the sched_mc_power_savings default to POWERSAVINGS_BALANCE_WAKEUP (2).
Sidenote, _please_ fix your mail client to not mess up the Cc: list via:
Mail-Followup-To: MinChan Kim <minchan.kim@gmail.com>, Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>, Linux Kernel <linux-kernel@vger.kernel.org>, Suresh B Siddha <suresh.b.siddha@intel.com>, Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Ingo Molnar <mingo@elte.hu>, Dipankar Sarma <dipankar@in.ibm.com>, Vatsa <vatsa@linux.vnet.ibm.com>, Gautham R Shenoy <ego@in.ibm.com>, Andi Kleen <andi@firstfloor.org>, David Collier-Brown <davecb@sun.com>, Tim Connors <tconnors@astro.swin.edu.au>, Max Krasnyansky <maxk@qualcomm.com>, Gregory Haskins <gregory.haskins@gmail.com>, Pavel Machek <pavel@suse.cz>, Andrew Morton <akpm@linux-foundation.org>
Ingo
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