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

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Message-ID: <20060921174310.GK24362@kernel.dk>
Date:	Thu, 21 Sep 2006 19:43:11 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Tejun Heo <htejun@...il.com>
Cc:	Andrew Lyon <andrew.lyon@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: JMicron 20360/20363 AHCI Controller much slower with 2.6.18

On Fri, Sep 22 2006, Tejun Heo wrote:
> 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?

It would also be nice to have a way to turn NCQ off, btw, just to rule
that out as well.

-- 
Jens Axboe

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