linux-kernel - Re: oltp ~10% regression with 2.6.27-rc5 on stoakley machine

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Message-ID: <20080904110901.GD8668@elte.hu>
Date:	Thu, 4 Sep 2008 13:09:01 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Subject: Re: oltp ~10% regression with 2.6.27-rc5 on stoakley machine


* Lin Ming <ming.m.lin@...el.com> wrote:

> I observed schedstats of sysbench, there's more
> "nr_failed_migrations_hot"
> 
> 2.6.27-rc4: se.nr_failed_migrations_hot 11
> 2.6.27-rc5: se.nr_failed_migrations_hot 95
> 
> task migration failed because of task_hot, the system is un-balanced?

would be nice to get a representative (==steady state) scheduler trace 
from the critical portions of that workload. See:

 http://people.redhat.com/mingo/sched-devel.git/readme-tracer.txt

	Ingo
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