From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, Gautham R Shenoy <ego@in.ibm.com>,
Balbir Singh <balbir@in.ibm.com>
Subject: Re: [RFC][PATCH 0/8] load-balancing and cpu_power -v2
Date: Thu, 03 Sep 2009 15:38:56 +0200 [thread overview]
Message-ID: <1251985136.7352.1.camel@laptop> (raw)
In-Reply-To: <20090903121045.GK7216@alberich.amd.com>
On Thu, 2009-09-03 at 14:10 +0200, Andreas Herrmann wrote:
> On Tue, Sep 01, 2009 at 10:34:31AM +0200, Peter Zijlstra wrote:
> > Anyway, have at it, poke holes and report issues.
>
> Tested it (to a certain extend).
> Found no performance degradation (on 1P, 2P, 4P systems). (One could
> think performance might slightly degrade due to more frequent
> __cpu_power updates).
Grand.
> This applies to modification of sched_mc_power_savings. And I think
> one of above scenarios is already broken in tip/master w/o your
> patches.
I suspect so, but confirmation would be good, I don't have a single
machine large enough to actually test any of that power saving muck.
> Otherwise especially wrt to integration of APERF/MPERF this seems to
> be a good approach.
On that, are there AMD systems supporting APERF/MPERF? I only know of
Intel machines doing so.
next prev parent reply other threads:[~2009-09-03 13:39 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-01 8:34 [RFC][PATCH 0/8] load-balancing and cpu_power -v2 Peter Zijlstra
2009-09-01 8:34 ` [RFC][PATCH 1/8] sched: restore __cpu_power to a straight sum of power Peter Zijlstra
2009-09-04 8:54 ` [tip:sched/balancing] sched: Restore " tip-bot for Peter Zijlstra
2009-09-01 8:34 ` [RFC][PATCH 2/8] sched: SD_PREFER_SIBLING Peter Zijlstra
2009-09-04 8:55 ` [tip:sched/balancing] sched: Add SD_PREFER_SIBLING tip-bot for Peter Zijlstra
2009-09-01 8:34 ` [RFC][PATCH 3/8] sched: update the cpu_power sum during load-balance Peter Zijlstra
2009-09-02 11:17 ` Gautham R Shenoy
2009-09-02 11:25 ` Peter Zijlstra
2009-09-04 8:55 ` [tip:sched/balancing] sched: Update " tip-bot for Peter Zijlstra
2009-09-01 8:34 ` [RFC][PATCH 4/8] sched: add smt_gain Peter Zijlstra
2009-09-02 11:22 ` Gautham R Shenoy
2009-09-02 11:26 ` Peter Zijlstra
2009-09-04 8:55 ` [tip:sched/balancing] sched: Add smt_gain tip-bot for Peter Zijlstra
2009-09-01 8:34 ` [RFC][PATCH 5/8] sched: dynamic cpu_power Peter Zijlstra
2009-09-02 11:24 ` Gautham R Shenoy
2009-09-04 8:55 ` [tip:sched/balancing] sched: Implement " tip-bot for Peter Zijlstra
2009-09-01 8:34 ` [RFC][PATCH 6/8] sched: scale down cpu_power due to RT tasks Peter Zijlstra
2009-09-04 8:56 ` [tip:sched/balancing] sched: Scale " tip-bot for Peter Zijlstra
2009-09-01 8:34 ` [RFC][PATCH 7/8] sched: try to deal with low capacity Peter Zijlstra
2009-09-02 11:29 ` Gautham R Shenoy
2009-09-04 8:56 ` [tip:sched/balancing] sched: Try " tip-bot for Peter Zijlstra
2009-09-01 8:34 ` [RFC][PATCH 8/8] sched: remove reciprocal for cpu_power Peter Zijlstra
2009-09-03 12:12 ` Andreas Herrmann
2009-09-04 8:56 ` [tip:sched/balancing] sched: Remove " tip-bot for Peter Zijlstra
2009-09-02 10:57 ` [RFC][PATCH 0/8] load-balancing and cpu_power -v2 Gautham R Shenoy
2009-09-03 12:10 ` Andreas Herrmann
2009-09-03 13:38 ` Peter Zijlstra [this message]
2009-09-04 7:19 ` Ingo Molnar
2009-09-04 9:27 ` [crash] " Ingo Molnar
2009-09-04 10:25 ` [tip:sched/balancing] sched: Fix dynamic power-balancing crash tip-bot for Ingo Molnar
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