From owner-freebsd-performance@FreeBSD.ORG Fri Apr 29 13:14:24 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 63C0816A4CE for ; Fri, 29 Apr 2005 13:14:24 +0000 (GMT) Received: from ms1.as.pvp.se (dns.pvp.se [213.64.187.226]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6F9B443D5D for ; Fri, 29 Apr 2005 13:14:23 +0000 (GMT) (envelope-from kama@pvp.se) Received: by ms1.as.pvp.se (Postfix, from userid 1001) id 5DD54A7; Fri, 29 Apr 2005 15:14:21 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by ms1.as.pvp.se (Postfix) with ESMTP id 59BBDA6; Fri, 29 Apr 2005 15:14:21 +0200 (CEST) Date: Fri, 29 Apr 2005 15:14:21 +0200 (CEST) From: kama X-X-Sender: kama@ns1.as.pvp.se To: Steven Hartland In-Reply-To: <093701c54caa$303aac30$7f06000a@int.mediasurface.com> Message-ID: <20050429150534.L22614@ns1.as.pvp.se> References: <20050428162201.39269.qmail@web41214.mail.yahoo.com><42711726.2000607@centtech.com><006201c54c46$14c0d290$b3db87d4@multiplay.co.uk> <093701c54caa$303aac30$7f06000a@int.mediasurface.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: Scott Long cc: Eric Anderson cc: freebsd-performance@freebsd.org cc: =?iso-8859-1?Q?=22Arne_W=F6rner=22=22?= cc: Petri Helenius 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 13:14:24 -0000 On Fri, 29 Apr 2005, Steven Hartland wrote: > Just retried with a ~10Gb data set: > Write to FS: > dd if=/dev/zero of=.testfile bs=1m count=10000 > 10000+0 records in > 10000+0 records out > 10485760000 bytes transferred in 92.517222 secs (113338466 bytes/sec) > > Read from FS: > dd if=.testfile of=/dev/null bs=1m count=10000 > 10000+0 records in > 10000+0 records out > 10485760000 bytes transferred in 225.723348 secs (46454034 bytes/sec) > > Read from device: > dd if=/dev/da0 of=/dev/null bs=1m count=10000 > 10000+0 records in > 10000+0 records out > 10485760000 bytes transferred in 200.723666 secs (52239779 bytes/sec) > > N.B. didn't do the write to the device direct as the array is > the system drive so I don't think it would take kindly to that :) > > So it doesn't seem like caching is an issue and as others are seeing > similar performance issues on other RAID controllers is could well > not be a driver issue but I'm not ruling that out as yet as it could be > the same problem in each respective driver. > So far Highpoint 1820a and 3ware ?? ( Pete can u fill in the blank here ) > are exhibiting the same issue. > I have just tested on my system between 4.11 and 5.4. Both uses the same configuration on the write disk. its a RAID1+0 on Compaq SA6404 (ciss) running UFS1. The write to disk is similar on 4.11 and 5.4, but the read is 100% slower on 5.4 than 4.11. the R:W condition on 4.11 is 1:1 and on 5.4 2:1. I have tested this with dd and my own written disktest program. The results on both program is similar. so it isn't dev-null issues. I have tested with both 1GB files and 10GB files. 1GB files where really fast on reading, but i consider them false due to the RAID cache. Something is really wrong here... /Bjorn