linux-kernel - Re: [Bug #14940] cfq-iosched: tiobench regression

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Date:	Wed, 30 Dec 2009 10:18:18 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
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>,
	Corrado Zoccolo <czoccolo@...il.com>,
	Gui Jianfeng <guijianfeng@...fujitsu.com>,
	Shaohua Li <shaohua.li@...el.com>
Subject: Re: [Bug #14940] cfq-iosched: tiobench regression

On Tue, Dec 29 2009, 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).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=14940
> Subject		: cfq-iosched: tiobench regression
> Submitter	: Shaohua Li <shaohua.li@...el.com>
> Date		: 2009-12-24 0:55 (6 days old)
> References	: http://marc.info/?l=linux-kernel&m=126161612401994&w=4

I don't think this should be labelled as a regression. It was already
known that we'd have less throughput for the many clients cases, it was
a trade off that was made to improve latencies.

-- 
Jens Axboe

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