linux-kernel - Re: 2.6.20-rc2+: CFQ halving disk throughput.

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Date:	Mon, 1 Jan 2007 15:30:57 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Rene Herman <rene.herman@...il.com>,
	Jens Axboe <jens.axboe@...cle.com>
cc:	Tejun Heo <htejun@...il.com>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.20-rc2+: CFQ halving disk throughput.



On Mon, 1 Jan 2007, Rene Herman wrote:

> Rene Herman wrote:
> 
> > In fact, it's CFQ. The PATA thing was a red herring. 2.6.20-rc2 and 3 give
> > me ~ 24 MB/s from "hdparm t /dev/hda" while 2.6.20-rc1 and below give me ~
> > 50 MB/s.
> > 
> > Jens: this is due to "[PATCH] cfq-iosched: tighten allow merge criteria",
> > 719d34027e1a186e46a3952e8a24bf91ecc33837:
> 
> axboe@...cle.com bounces for me. Could one of the other recipients of parent
> message try to forward?

It should be "Jens Axboe <jens.axboe@...cle.com>". 

Jens was away over the holidays, hopefully he'll be back today or 
tomorrow.

		Linus
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