linux-kernel - Re: [Bug #14950] tbench regression with 2.6.33-rc1

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Date:	Mon, 22 Mar 2010 07:41:50 +0100
From:	Mike Galbraith <efault@....de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [Bug #14950] tbench regression with 2.6.33-rc1

On Sun, 2010-03-21 at 21:30 +0100, Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.32 and 2.6.33.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.32 and 2.6.33.  Please verify if it still should
> be listed and let the tracking team know (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=14950
> Subject		: tbench regression with 2.6.33-rc1
> Submitter	: Lin Ming <ming.m.lin@...el.com>
> Date		: 2009-12-25 11:11 (87 days old)
> References	: http://marc.info/?l=linux-kernel&m=126174044213172&w=4

This needs retest in tip.  I submitted some patchlets to shave a few
cycles, with which my box (fwtw) shows zero regression 2.6.31 ->
tip.today, whereas there was nothing but regression of up to ~6% in
between, magnitude seemingly depending on phase-of-moon.  Actually,
patched tip at submission time was a fraction above 31 throughput.
Retesting today, it's a fraction of a percent below again (tbench is
annoyingly jittery).

Hopefully, this tbench regression is on it's way to retirement.

	-Mike

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