linux-kernel - Re: [Bug #15192] netperf ~50% regression with 2.6.33-rc1, bisect to 1b9508f

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Date:	Sat, 20 Feb 2010 15:52:57 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Mike Galbraith <efault@....de>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	venkatesh.pallipadi@...el.com
Subject: Re: [Bug #15192] netperf ~50% regression with 2.6.33-rc1, bisect
 to 1b9508f

On Mon, 2010-02-01 at 16:04 +0800, Mike Galbraith wrote:
> On Mon, 2010-02-01 at 01:22 +0100, Rafael J. Wysocki wrote:
> > This message has been generated automatically as a part of a report
> > of recent regressions.
> > 
> > The following bug entry is on the current list of known regressions
> > from 2.6.32.  Please verify if it still should be listed and let me know
> > (either way).
> 
> Yes, it should remain open.  We're currently waiting for some data from
> Lin Ming.  The regression itself isn't making much sense.. a kernel with
> NEWIDLE disabled should show the same performance, but does not.  

(sorry for late response, I'm just back from vacation)

We finally located this to a bug in mwait based C-state entry.
Venki's patch has fixed it.
http://patchwork.kernel.org/patch/78544/

Venki, this is the original report,
http://marc.info/?l=linux-kernel&m=126441481427331&w=4

Thanks,
Lin Ming

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