From owner-freebsd-geom@FreeBSD.ORG Fri Jan 30 20:55:03 2009 Return-Path: Delivered-To: freebsd-geom@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id A4211106564A for ; Fri, 30 Jan 2009 20:55:03 +0000 (UTC) (envelope-from gcubfg-freebsd-geom@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id 2442A8FC13 for ; Fri, 30 Jan 2009 20:55:03 +0000 (UTC) (envelope-from gcubfg-freebsd-geom@m.gmane.org) Received: from root by ciao.gmane.org with local (Exim 4.43) id 1LT0OF-0006bz-6Y for freebsd-geom@freebsd.org; Fri, 30 Jan 2009 20:55:03 +0000 Received: from lara.cc.fer.hr ([161.53.72.113]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 30 Jan 2009 20:55:03 +0000 Received: from ivoras by lara.cc.fer.hr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 30 Jan 2009 20:55:03 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-geom@freebsd.org From: Ivan Voras Date: Fri, 30 Jan 2009 21:50:55 +0100 Lines: 47 Message-ID: References: <6612C205-C346-4493-9DA4-3B5A73E9A4F7@freebsd.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig972A8BB3359AF9247701B7E9" X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: lara.cc.fer.hr User-Agent: Thunderbird 2.0.0.19 (X11/20090105) In-Reply-To: <6612C205-C346-4493-9DA4-3B5A73E9A4F7@freebsd.org> X-Enigmail-Version: 0.95.0 Sender: news Subject: Re: Performance numbers? X-BeenThere: freebsd-geom@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: GEOM-specific discussions and implementations List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Jan 2009 20:55:03 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig972A8BB3359AF9247701B7E9 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Eric Anderson wrote: > Hi GEOMers! >=20 > Does anyone have any benchmarks or numbers relating to GEOM performance= ? >=20 > I tried doing some on my own, but I didn't get very satisfactory > results, so I'm curious what others have seen or used. >=20 > My hardware is a Core 2 Quad, with 4GB of ram. >=20 > First, I made an mdconfig'ed malloc backed 'disk' of 1.5GB. Then, I > tried running such tools as rawio, and diskinfo. rawio fails with > input/output errors, and diskinfo wants a larger device to give the ful= l > stats. I ended up using purely dd since that worked. Interestingly > enough, dd'ing to the malloc device results in about 1000 operations pe= r > second, regardless of a blocksize of 512bytes or 1MB. It's a good idea for testing. 1000 ops/s looks suspiciously like HZ, though I don't know why HZ would influence GEOM (AFAIK context switches between threads, including GEOM threads do not depend on it) - can you try ruling out HZ? --------------enig972A8BB3359AF9247701B7E9 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFJg2gwldnAQVacBcgRAtZAAKDrj3n18jLfzRkBkNs/Cqk8JoiZPQCfVmXJ MaqV5d+9n7UKOs62jJ+mx30= =Ym8U -----END PGP SIGNATURE----- --------------enig972A8BB3359AF9247701B7E9--