linux-kernel - Re: 2.6.24-git4+ regression

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Message-Id: <1203320304.26269.3.camel@homer.simson.net>
Date:	Mon, 18 Feb 2008 08:38:24 +0100
From:	Mike Galbraith <efault@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Lukas Hejtmanek <xhejtman@....muni.cz>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	mingo@...hat.com, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, dhaval@...ux.vnet.ibm.com,
	aneesh.kumar@...ibm.com
Subject: Re: 2.6.24-git4+ regression


On Mon, 2008-02-18 at 05:28 +0100, Ingo Molnar wrote: 
> * Lukas Hejtmanek <xhejtman@....muni.cz> wrote:
> 
> > On Thu, Feb 14, 2008 at 10:25:51PM +0530, Srivatsa Vaddagiri wrote:
> > > The patch is against 2.6.25-rc1. I would request you to check for
> > > difference it makes with CONFIG_FAIR_GROUP_SCHED and
> > > CONFIG_FAIR_USER_SCHED turned on.
> > 
> > well, I tried the patch against 2.6.25-rc2-git1. It seems to be better 
> > but without CONFIG_FAIR_GROUP_SCHED it is still even better.
> 
> could you try latest sched-devel.git, does it behave any better?

Here, it does not.  It seems fine without CONFIG_FAIR_GROUP_SCHED.

Oddity:  mainline git with Srivatsa's test patch improves markedly, and
using sched_latency_ns and sched_wakeup_granularity_ns, I can tweak the
regression into submission.  With sched-devel, I cannot tweak it away
with or without the test patch.  Dunno how useful that info is.

	-Mike

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