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

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Message-ID: <46151FCD.6000700@rtr.ca>
Date:	Thu, 05 Apr 2007 12:11:57 -0400
From:	Mark Lord <lkml@....ca>
To:	Phillip Susi <psusi@....rr.com>
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?

Phillip Susi wrote:
> Mark Lord wrote:
>> This is mostly a problem with the WD Raptor drive, and some other WD 
>> drives.
>> I have not yet encountered/noticed the problem with other brands.
> 
> Sounds like this is a serious bug in the WD firmware.

For personal systems, yes.  For servers, probably not a bug.

Disabling readahead means faster execution queued commands,
since it doesn't have to "linger" and do unwanted read-ahead.
So this bug is a "feature" for random access servers.
And a big nuisance for everything else.

Cheers
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