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Date: Wed, 02 Sep 2009 11:29:14 -0400
From: "Derek (freebsd lists)" <482254ac@razorfever.net>
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To: Emil Mikulic <emikulic@gmail.com>
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Cc: freebsd-current@freebsd.org
Subject: Re: siis/atacam/ata/gmirror 8.0-BETA3 disk performance
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Emil Mikulic wrote:
> Huh, I have the same disk:
> 
> # dmesg | grep ad4
> ad4: 1430799MB <Seagate ST31500341AS CC1H> at ata2-master SATA300
> 
> Sequential read on a disk this size should be around 120MB/sec at the
> outer tracks:
> 
> # dd if=/dev/ad4 of=/dev/null bs=128k count=5000
> 655360000 bytes transferred in 5.171389 secs (126728039 bytes/sec)
> 

Would you mind describing the controller/bus that you are using 
to get these speeds?

Thanks!
- Derek