linux-kernel - Re: [PATCH v7 0/8] Tunable sched_mc_power

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Message-Id: <1231264117.5254.23.camel@marge.simson.net>
Date:	Tue, 06 Jan 2009 18:48:37 +0100
From:	Mike Galbraith <efault@....de>
To:	svaidy@...ux.vnet.ibm.com
Cc:	Ingo Molnar <mingo@...e.hu>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v7 0/8] Tunable sched_mc_power_savings=n

On Tue, 2009-01-06 at 20:37 +0530, Vaidyanathan Srinivasan wrote:

> Hi Mike,
> 
> Thanks for the detailed benchmark reports.  Glad to hear that
> sched_mc=2 is helping in most scenarios.  Though we would be tempted to
> make it default, I would still like to default to zero in order to
> provide base line performance.  I would expect end users to flip the
> settings to sched_mc=2 if it helps their workload in terms of
> performance and/or power savings.

The mysql+oltp peak loss is there either way, but with 2, mid range
throughput is ~28 baseline.  High end (yawn) is better, and the nfs
kbuild performs better than baseline.

Baseline performance, at least wrt mysql+oltp doesn't seem to be an
option.  Not my call.  More testing and more testers required I suppose.

	-Mike

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