linux-kernel - Re: SATA Harddisk speed drop of 100 MB/s

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Message-ID: <20070625160412.GB2432@alinoe.com>
Date:	Mon, 25 Jun 2007 18:04:12 +0200
From:	Carlo Wood <carlo@...noe.com>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Arjan van de Ven <arjan@...radead.org>,
	Jeff Garzik <jeff@...zik.org>, linux-kernel@...r.kernel.org
Subject: Re: SATA Harddisk speed drop of 100 MB/s

On Mon, Jun 25, 2007 at 11:18:41AM -0400, Lennart Sorensen wrote:
> How do you know 165MB/s is correct?

It is the maximum value I measure. It's also the value that I
measure consistently with NCQ off, like with 2.6.18. Finally,
even before I bought this PC, I did some research and the RAID
with Raptors was recommended by someone with a lot of experience
with them. He told me that I could count on (N - 1) * 75 MB/s
(on average) for an array with N disks. I had expected 150 MB/s,
which is about what I get. The 165 MB/s is on the outside
of the disk (low partition).

-- 
Carlo Wood <carlo@...noe.com>
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