linux-kernel - Re: [PATCH] x86,sched: Fix sched_smt_power

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Message-ID: <20120110165129.GC17432@dirshya.in.ibm.com>
Date:	Tue, 10 Jan 2012 22:21:29 +0530
From:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
To:	Youquan Song <youquan.song@...el.com>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com, akpm@...ux-foundation.org, stable@...r.kernel.org,
	arjan@...ux.intel.com, len.brown@...el.com, anhua.xu@...el.com,
	chaohong.guo@...el.com, Youquan Song <youquan.song@...ux.intel.com>
Subject: Re: [PATCH] x86,sched: Fix sched_smt_power_savings totally broken

* Youquan Song <youquan.song@...el.com> [2012-01-10 11:54:26]:

> 
> > Youquan, As far as I know both the
> > sched_smt_power_savings/sched_mc_power_savings are broken for atleast an
> > year.
> > 
> > Have you checked the state of 'sched_mc_power_savings' to see if it is
> > working or gets addressed with your proposed patches?
> Thanks Suresh!
> 
> We have verified that sched_mc_power_savings works well in mainline and
> -tip tree, only sched_smt_power_savings broken.

Hi Suresh,

My testing also shows that sched_mc works find and only sched_smt
suffers from the group capacity problem at the core level.

--Vaidy

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