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

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Message-ID: <BAY20-F2534ADD292CC02D5ACAFBCF9670@phx.gbl>
Date:	Tue, 03 Apr 2007 21:31:04 +0000
From:	"Paa Paa" <paapaa125@...mail.com>
To:	nickpiggin@...oo.com.au, linux-kernel@...r.kernel.org
Subject: Re: Lower HD transfer rate with NCQ enabled?

>>Q: What conclusion can I make on "hdparm -t" results or can I make any 
>>conclusions? Do I really have lower performance with NCQ or not? If I do, 
>>is this because of my HD or because of kernel?
>
>What IO scheduler are you using? If AS or CFQ, could you try with deadline?

I was using CFQ. I now tried with Deadline and that doesn't seem to degrade 
the performance at all! With Deadline I got 60MB/s both with and without 
NCQ. This was with "hdparm -t".

So what does this tell us?

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