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Date: Thu, 28 Apr 2005 17:34:55 -0700
From: Peter Losher <Peter_Losher@isc.org>
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To: Steven Hartland <killing@multiplay.co.uk>
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cc: freebsd-hackers@freebsd.org
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Subject: Re: Very low disk performance Highpoint 1820a
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Steven Hartland wrote:

> 5.4-STABLE Highpoint 1820a RAID 5 ( 5 disk )
> dd if=/dev/da0 of=/dev/null bs=64k count=10000
> 10000+0 records in
> 10000+0 records out
> 655360000 bytes transferred in 13.348032 secs (49097875 bytes/sec)

Have you tried the driver supplied by Highpoint as a pre-compiled kernel
module?  I have a 1820A with 4x400GB Hitachi SATA disks (RAID5 + 1 Hot
Spare) in a system running 5.3-RC3/amd64, where I have to use the kernel
module, and I get almost double the speed that you have:

-=-
% dd if=/dev/da0 of=/dev/null bs=64k count=10000
10000+0 records in
10000+0 records out
655360000 bytes transferred in 7.775190 secs (84288614 bytes/sec)
-=-

Best Wishes - Peter
--
Peter_Losher@isc.org | ISC | OpenPGP 0xE8048D08 | "The bits must flow"

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