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

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Date:	Mon, 01 Jan 2007 23:56:17 +0100
From:	Rene Herman <rene.herman@...il.com>
To:	Tejun Heo <htejun@...il.com>, Jens Axboe <axboe@...cle.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: 2.6.20-rc2+: CFQ halving disk throughput.

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?

Rene.
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