From owner-freebsd-stable@FreeBSD.ORG Tue Apr 1 17:43:30 2003 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id CF76C37B401 for ; Tue, 1 Apr 2003 17:43:30 -0800 (PST) Received: from wantadilla.lemis.com (wantadilla.lemis.com [192.109.197.80]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2B94A43FAF for ; Tue, 1 Apr 2003 17:43:29 -0800 (PST) (envelope-from grog@lemis.com) Received: by wantadilla.lemis.com (Postfix, from userid 1004) id B2C3851A68; Wed, 2 Apr 2003 11:13:26 +0930 (CST) Date: Wed, 2 Apr 2003 11:13:26 +0930 From: Greg 'groggy' Lehey To: Jason Andresen Message-ID: <20030402014326.GJ34617@wantadilla.lemis.com> References: <20030330125138.K23911@leelou.in.tern> <3E870CC7.5000204@mac.com> <20030330175605.E23911@leelou.in.tern> <3E87204C.5060304@ludd.luth.se> <3E88524A.1060600@mitre.org> <3E88AECD.10607@liwing.de> <3E88B601.90802@mitre.org> <20030401004953.GE34617@wantadilla.lemis.com> <3E89A0DE.7040505@mitre.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="bYB/dvygrOI2NuBf" Content-Disposition: inline In-Reply-To: <3E89A0DE.7040505@mitre.org> User-Agent: Mutt/1.4i Organization: The FreeBSD Project Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.FreeBSD.org/ X-PGP-Fingerprint: 9A1B 8202 BCCE B846 F92F 09AC 22E6 F290 507A 4223 cc: FreeBSD Stable List Subject: Re: vinum performance X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Apr 2003 01:43:31 -0000 --bYB/dvygrOI2NuBf Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tuesday, 1 April 2003 at 9:23:26 -0500, Jason Andresen wrote: > Greg 'groggy' Lehey wrote: > >>>>> I get 4565 K/sec on modern ATA/133 HDDs. >>>>> >>>>> Reading is much better at 91908 K/sec at least. >>> >>> Well, I'm writing 200MB files most of the time, so the stripe size is >>> not an issue. I'm just wondering why the reads are *20* times faster >>> than the writes. >> >> >> They're not. I don't know where you get that read figure from, but no >> disk can transfer that fast, and you don't appear to be doing multiple >> transfers in parallel. > > That was what bonnie++ reported. As I've said elsewhere, bonnie++ is not an appropriate benchmark here. >>> I think the read performance was CPU limited in this case. >> >> >> I think you were reading from cache. > > Quite possible. I'm not sure how bonnie handles that. It reads from cache. Greg -- See complete headers for address and phone numbers --bYB/dvygrOI2NuBf Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iD8DBQE+ikA+IubykFB6QiMRAl8nAJ0dsFHLcn8HA9qmShh0TBZe1IPoQgCeMIYJ /h+M6MKLfWNYcZEech9zTeM= =UmVH -----END PGP SIGNATURE----- --bYB/dvygrOI2NuBf--