From owner-freebsd-performance@FreeBSD.ORG Fri Apr 29 03:45:30 2005 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E148A16A4CE; Fri, 29 Apr 2005 03:45:30 +0000 (GMT) Received: from mh2.centtech.com (moat3.centtech.com [207.200.51.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id EF28743D54; Fri, 29 Apr 2005 03:45:29 +0000 (GMT) (envelope-from anderson@centtech.com) Received: from [192.168.51.77] ([192.168.51.77]) by mh2.centtech.com (8.13.1/8.13.1) with ESMTP id j3T3jSWZ041344; Thu, 28 Apr 2005 22:45:28 -0500 (CDT) (envelope-from anderson@centtech.com) Message-ID: <4271ADA0.2070000@centtech.com> Date: Thu, 28 Apr 2005 22:44:32 -0500 From: Eric Anderson User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.5) Gecko/20050325 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Peter Losher References: <06ba01c54bff$8c5aed00$7f06000a@int.mediasurface.com> <4271812F.4060808@isc.org> In-Reply-To: <4271812F.4060808@isc.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: freebsd-hackers@freebsd.org cc: freebsd-performance@freebsd.org cc: Steven Hartland Subject: Re: Very low disk performance Highpoint 1820a X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Apr 2005 03:45:31 -0000 Peter Losher wrote: > 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) I'm using fiber channel SATA, and I get 2x write as I do read, which doesn't make sense to me. What kind of write speeds do you get? My tiny brain tells me that reads should be faster than writes with a RAID5. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology A lost ounce of gold may be found, a lost moment of time never. ------------------------------------------------------------------------