From owner-freebsd-hackers@FreeBSD.ORG  Tue May 10 05:40:33 2005
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Date: Tue, 10 May 2005 01:52:25 -0400
From: jason henson <jason@ec.rr.com>
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To: Amandeep <aman@chamkila.org>
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cc: freebsd-hackers@freebsd.org
cc: freebsd-questions@freebsd.org
Subject: Re: Low HDD tranfer rate with FreeBSD 5.3-Release
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Amandeep wrote:

> Hi all,
>
> I am using Tyan S2098 MB with 160GB Maxtor ATA  Drive and the transfer 
> rate is very low. FreeBSD 5.3-Release.
> Any ideas what is going on here.
>
> The transfer rate is about 15MB/s
>
> when I run
> #dd if=/dev/zero of=/usr/junk bs=8192
>
> then do
> #iostat 1
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Check the performance archive for a long thread on disk tweaking.  
sysctl vfs.read_max=32 should give you a good boost, but read that 
thread being attempting this.  There was another tweak in there I found 
interesting, but can be dangerous.  I'll let you look that one up.