linux-kernel - Re: Why is NCQ enabled by default by libata? (2.6.20)

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Date:	Sat, 24 Mar 2007 18:43:00 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Why is NCQ enabled by default by libata? (2.6.20)

On Sat, 24 Mar 2007 12:38:02 -0400 (EDT)
Justin Piszcz <jpiszcz@...idpixels.com> wrote:

> Without NCQ, performance is MUCH better on almost every operation, with 
> the exception of 2-3 items.

It depends on the drive. Generally NCQ is better but some drive firmware
isn't too bright and there are probably still cases where we get bad
interactions in the kernel code that want tuning too
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