linux-kernel - Re: Lower HD transfer rate with NCQ enabled?

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Date:	Tue, 03 Apr 2007 15:17:40 -0400
From:	Phillip Susi <psusi@....rr.com>
To:	Mark Lord <lkml@....ca>
CC:	Chris Snook <csnook@...hat.com>, Paa Paa <paapaa125@...mail.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Lower HD transfer rate with NCQ enabled?

Mark Lord wrote:
> But WD drives, in particular the Raptor series, have a firmware "feature"
> that disables "drive readahead" whenever NCQ is in use.

Why is this an issue?  Shouldn't the kernel be sending down its own 
readahead requests to keep the disk busy?



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