From owner-freebsd-performance@FreeBSD.ORG Mon May 2 21:17:56 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 04C2516A4CF for ; Mon, 2 May 2005 21:17:56 +0000 (GMT) Received: from smtp819.mail.sc5.yahoo.com (smtp819.mail.sc5.yahoo.com [66.163.170.5]) by mx1.FreeBSD.org (Postfix) with SMTP id 58E1043D1F for ; Mon, 2 May 2005 21:17:55 +0000 (GMT) (envelope-from noackjr@alumni.rice.edu) Received: from unknown (HELO optimator.noacks.org) (noacks@swbell.net@70.240.205.64 with login) by smtp819.mail.sc5.yahoo.com with SMTP; 2 May 2005 21:17:54 -0000 Received: from localhost (localhost [127.0.0.1]) by optimator.noacks.org (Postfix) with ESMTP id EE2D1610A; Mon, 2 May 2005 16:17:53 -0500 (CDT) Received: from optimator.noacks.org ([127.0.0.1]) by localhost (optimator.noacks.org [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 07761-12-4; Mon, 2 May 2005 16:17:51 -0500 (CDT) Received: from [127.0.0.1] (optimator [192.168.1.11]) by optimator.noacks.org (Postfix) with ESMTP id 36E8C60D2; Mon, 2 May 2005 16:17:51 -0500 (CDT) Message-ID: <427698F9.8030501@alumni.rice.edu> Date: Mon, 02 May 2005 16:17:45 -0500 From: Jonathan Noack User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Steven Hartland References: <19879.1115061648@critter.freebsd.dk> <004101c54f57$abc04220$b3db87d4@multiplay.co.uk> In-Reply-To: <004101c54f57$abc04220$b3db87d4@multiplay.co.uk> X-Enigmail-Version: 0.91.0.0 OpenPGP: id=991D8195; url=http://www.noacks.org/cert/noackjr.asc Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigAF948B5FA8AE6B7B648DD275" X-Virus-Scanned: amavisd-new at noacks.org cc: Robert Watson cc: Poul-Henning Kamp cc: Eric Anderson cc: freebsd-performance@freebsd.org Subject: Re: Very low disk performance on 5.x X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: noackjr@alumni.rice.edu List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 May 2005 21:17:56 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigAF948B5FA8AE6B7B648DD275 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 5/2/2005 3:43 PM, Steven Hartland wrote: > ----- Original Message ----- From: "Poul-Henning Kamp" >>> To eliminate various parts of the subsystems I've just tested: >>> dd if=/dev/da0 of=/dev/null bs=64k count=100000 >>> Read: 220Mb/s >> >> This is a very interesting number to measure, you'll never >> see anything else going faster than that. Presumably >> this is -current ? > > Nope thats 5.4-STABLE this should be at the very least > 260Mb/s as thats what the controller has been measured on > linux at even through the FS. Um... not quite. That was the number you listed for S/W RAID5. In that case you're not benchmarking the controller in the same way; the controller is just serving requests with no RAID processing overhead at all. Could you get results for Linux that bypassed the filesystem but used H/W RAID5 like you are with FreeBSD? >>> Compared with: >>> dd if=/usr/testfile of=/dev/null bs=64k count=100000 >>> Read: 152Mb/s -- Jonathan Noack | noackjr@alumni.rice.edu | OpenPGP: 0x991D8195 --------------enigAF948B5FA8AE6B7B648DD275 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (MingW32) iD8DBQFCdpj9UFz01pkdgZURAiy4AJ9gNWWnE/F4Wnui9HVk5c/UDZNYMwCgxQYx H1N2wcElnMeLOMyjAz7YYQs= =sXiJ -----END PGP SIGNATURE----- --------------enigAF948B5FA8AE6B7B648DD275--