From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Lord <liml@rtr.ca>
Subject: Re: NCQ is slower in some cases?
Date: Thu, 23 Jul 2009 11:39:21 -0400
Message-ID: <4A688429.50800@rtr.ca>
References: <1248320643.9035.19.camel@sli10-desk.sh.intel.com> <4A67E0AA.6060405@pobox.com> <20090723054804.GB7473@sli10-desk.sh.intel.com>
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To: Shaohua Li <shaohua.li@intel.com>
Cc: Jeff Garzik <jgarzik@pobox.com>, linux-ide <linux-ide@vger.kernel.org>, "tj@kernel.org" <tj@kernel.org>, "Zhang, Yanmin" <yanmin.zhang@intel.com>

Shaohua Li wrote:
>
> I just occasionally did the test and hadn't resource to do a full test.
> I tested two hard disks (one from WDC the other Seegate), both have the
> same behavior. If it's possible hardware will slower with NCQ in some
> cases, I'll not borther spending time on it any more.
> So can you guys suggest if the issue is related with hardware?
..

WD Raptor drives were one of the known "slower with NCQ" drives,
except for random I/O of course.

Cheers