From owner-freebsd-fs@FreeBSD.ORG Wed Jun 24 23:03:15 2009 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BB7CD1065670 for ; Wed, 24 Jun 2009 23:03:15 +0000 (UTC) (envelope-from freebsd-fs@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id 42D0B8FC17 for ; Wed, 24 Jun 2009 23:03:14 +0000 (UTC) (envelope-from freebsd-fs@m.gmane.org) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1MJbUn-0004EA-4e for freebsd-fs@freebsd.org; Wed, 24 Jun 2009 23:03:13 +0000 Received: from 93-138-17-96.adsl.net.t-com.hr ([93.138.17.96]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 24 Jun 2009 23:03:13 +0000 Received: from ivoras by 93-138-17-96.adsl.net.t-com.hr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 24 Jun 2009 23:03:13 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-fs@freebsd.org From: Ivan Voras Date: Thu, 25 Jun 2009 01:02:48 +0200 Lines: 59 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig830E75D9D2AE33084C68CA2F" X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 93-138-17-96.adsl.net.t-com.hr User-Agent: Thunderbird 2.0.0.22 (Windows/20090605) In-Reply-To: X-Enigmail-Version: 0.95.7 Sender: news Cc: freebsd-geom@freebsd.org Subject: Re: read benchmarks: ufs/zfs/ext3 raidz/raid5 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Jun 2009 23:03:16 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig830E75D9D2AE33084C68CA2F Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Dan Naumov wrote: > Another FreeBSD person on a forum I frequent did some read benchmarks > on his system: Athlon64 3500+ with 2GB DDR2 SDRAM, a WD 250GB system > drive, and 5 Seagate Barracuda 750GB SATA-II data drives. ZFS and UFS > testing was done using FreeBSD 7.2-RELEASE amd64, and ext3 testing was > done using Ubuntu Server 8.04-LTS amd64. The used disks do not support > NCQ, so there is no "NCQ advantage" on the Linux side. >=20 > Random Access reads, 5MB chunks: > http://virtual.tehinterweb.net/livejournal/2009-06-22_zfs_diskperf/zfs-= diskperf-untuned-5mb.png > Random Access reads, 1MB chunks: > http://virtual.tehinterweb.net/livejournal/2009-06-22_zfs_diskperf/zfs-= diskperf-untuned-1mb.png > Random Access reads, 5MB chunks (big list): > http://virtual.tehinterweb.net/livejournal/raid_performance/raid-diskpe= rf-5mb-all.png >=20 > Here is the original forum discussion thread: > http://episteme.arstechnica.com/eve/forums/a/tpc/f/96509133/m/857002910= 041 This looks about consistent with what I see when comparing ext3 to ZFS and/or UFS on 7.x systems. I have theories and hunches why IO in FreeBSD is slower than on Linux (and for different RAID tools / GEOM classes the reasons are slightly different) but nothing I can back with proof and measurements. I can only confirm that it is consistently slower. I haven't yet tried testing 8 so if you're looking for ideas for testing, try it (disable debugging before you use 8-CURRENT). I think ZFS has some concurrency-enhancing additions there (which will help in case the benchmark was done with a tool testing concurrency; I don't see what was used in the above pages). --------------enig830E75D9D2AE33084C68CA2F Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkpCsKAACgkQldnAQVacBcgLAQCgiVfvtVz9Y1PhH920AgLD/CnA M9IAnAmLI4lV5rqbkOz13uOZysR0tcik =gWQq -----END PGP SIGNATURE----- --------------enig830E75D9D2AE33084C68CA2F--