linux-kernel - Re: JMicron 20360/20363 AHCI Controller much slower with 2.6.18

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Date:	Fri, 22 Sep 2006 02:00:59 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Andrew Lyon <andrew.lyon@...il.com>
CC:	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...e.de>
Subject: Re: JMicron 20360/20363 AHCI Controller much slower with 2.6.18

Andrew Lyon wrote:
> Hi,
> 
> I have a Gigabyte GA_965P_DS3 with Core 2 Duo CPU, wd raptor connected
> to onboard JMicron 20360/20363 AHCI Controller, with 2.6.18 the drive
> is very slow:
> 
> beast ~ # uname -a
> Linux beast 2.6.18 #1 SMP Wed Sep 20 15:04:24 BST 2006 i686 Intel(R) 
> Core(TM)2 C
> PU          6600  @ 2.40GHz GNU/Linux
> beast ~ # hdparm -t /dev/sda
> 
> /dev/sda:
> Timing buffered disk reads:  100 MB in  3.02 seconds =  33.10 MB/sec

Which IO scheduler are you using?  If you're using anticipatory or cfq, 
can you try deadline?

Thanks.

-- 
tejun
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