linux-kernel - Re: tbench regression with 2.6.33-rc1

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Message-Id: <1262065745.17082.0.camel@marge.simson.net>
Date:	Tue, 29 Dec 2009 06:49:05 +0100
From:	Mike Galbraith <efault@....de>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	"peterz@...radead.org" <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Subject: Re: tbench regression with 2.6.33-rc1

On Tue, 2009-12-29 at 13:19 +0800, Lin Ming wrote:
> On Tue, 2009-12-29 at 13:24 +0800, Mike Galbraith wrote:
> > On Tue, 2009-12-29 at 10:09 +0800, Lin Ming wrote:
> > > And also no regression if I run tbench with RT scheduler on tulsa
> > > machine, as below command,
> > > 
> > > schedtool -R -p 20 -e tbench_srv &
> > > schedtool -R -p 20 -e tbench 32
> > 
> > Hm, odd.  I'd expect tbench to suffer when run SCHED_RR, and here it
> > does, achieving roughly 85% of lowest SCHED_OTHER throughput.
> 
> Here is some misunderstanding.
> I compared SCHED_RR tbench with 2.6.32 and 2.6.33-rc1 and no regression
> found.
> 
> For the same kernel, SCHED_RR tbench only achieved ~40% of SCHED_OTHER
> throughput.

Ah.  Thanks for the clarification.

	-Mike

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