From: Dipankar Sarma <dipankar@in.ibm.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: 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>,
Arjan van de Ven <arjan@infradead.org>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
Vatsa <vatsa@linux.vnet.ibm.com>,
Gautham R Shenoy <ego@in.ibm.com>,
Andi Kleen <andi@firstfloor.org>,
Gregory Haskins <gregory.haskins@gmail.com>,
Mike Galbraith <efault@gmx.de>,
Thomas Gleixner <tglx@linutronix.de>,
Arun Bharadwaj <arun@linux.vnet.ibm.com>
Subject: Re: [RFC PATCH v1 0/3] Saving power by cpu evacuation using sched_mc=n
Date: Mon, 27 Apr 2009 11:24:51 +0530 [thread overview]
Message-ID: <20090427055451.GF13342@in.ibm.com> (raw)
In-Reply-To: <20090427035216.GD10087@elte.hu>
On Mon, Apr 27, 2009 at 05:52:16AM +0200, Ingo Molnar wrote:
>
> Regarding the values for 2...5 - is the AvgPower column time
> normalized or workload normalized?
>
> If it's time normalized then it appears there's no power win here at
> all: we'd be better off by throttling the workload directly (by
> injecting sleeps or something like that), right?
Energy savings with this will depend on the workload running. We have
seen transactional workloads where taking off a few cores has almost
no impact on throughput or response time.
Thanks
Dipankar
next prev parent reply other threads:[~2009-04-27 5:55 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-26 20:46 [RFC PATCH v1 0/3] Saving power by cpu evacuation using sched_mc=n Vaidyanathan Srinivasan
2009-04-26 20:46 ` [RFC PATCH v1 1/3] sched: add more levels of sched_mc Vaidyanathan Srinivasan
2009-04-26 20:46 ` [RFC PATCH v1 2/3] sched: threshold helper functions Vaidyanathan Srinivasan
2009-04-26 20:47 ` [RFC PATCH v1 3/3] sched: loadbalancer hacks for forced packing of tasks Vaidyanathan Srinivasan
2009-04-27 3:52 ` [RFC PATCH v1 0/3] Saving power by cpu evacuation using sched_mc=n Ingo Molnar
2009-04-27 5:43 ` Vaidyanathan Srinivasan
2009-04-27 5:53 ` Ingo Molnar
2009-04-27 6:39 ` Vaidyanathan Srinivasan
2009-04-27 7:01 ` Balbir Singh
2009-04-27 5:54 ` Dipankar Sarma [this message]
2009-04-27 10:09 ` Peter Zijlstra
2009-04-27 14:20 ` Vaidyanathan Srinivasan
2009-04-28 8:33 ` Peter Zijlstra
2009-04-28 8:52 ` Ingo Molnar
2009-04-28 16:15 ` Vaidyanathan Srinivasan
2009-04-28 16:11 ` Vaidyanathan Srinivasan
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