From owner-freebsd-stable@FreeBSD.ORG Wed Mar 7 19:13:30 2007 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 821A416A400 for ; Wed, 7 Mar 2007 19:13:30 +0000 (UTC) (envelope-from freebsd-stable@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id 0CD4D13C478 for ; Wed, 7 Mar 2007 19:13:30 +0000 (UTC) (envelope-from freebsd-stable@m.gmane.org) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1HP1Zj-000765-1p for freebsd-stable@freebsd.org; Wed, 07 Mar 2007 20:13:23 +0100 Received: from 89-172-34-24.adsl.net.t-com.hr ([89.172.34.24]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 07 Mar 2007 20:13:23 +0100 Received: from ivoras by 89-172-34-24.adsl.net.t-com.hr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 07 Mar 2007 20:13:23 +0100 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-stable@freebsd.org From: Ivan Voras Date: Wed, 07 Mar 2007 20:13:09 +0100 Lines: 94 Message-ID: References: <20070306020826.GA18228@nowhere> <45ECF00D.3070101@samsco.org><20070306050312.GA2437@nowhere><008101c75fcc$210c74a0$0c00a8c0@Artem> <001a01c7601d$5d635ee0$0c00a8c0@Artem> <001801c7603a$5339e020$0c00a8c0@Artem> <20070307105144.1d4a382f@daydream.goid.lan><002801c760e2$5cb5eb50$0c00a8c0@Artem> <005b01c760e6$9a798bf0$0c00a8c0@Artem> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig4D33CC9435532B7BB57A0350" X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: 89-172-34-24.adsl.net.t-com.hr User-Agent: Thunderbird 1.5.0.10 (Windows/20070221) In-Reply-To: <005b01c760e6$9a798bf0$0c00a8c0@Artem> X-Enigmail-Version: 0.94.1.2 Sender: news Cc: freebsd-geom@freebsd.org Subject: Re: Some Unix benchmarks for those who are interesed X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 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, 07 Mar 2007 19:13:30 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig4D33CC9435532B7BB57A0350 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Artem Kuchin wrote: > Hmm. what kind of HDD, RAID or whatever are you using? > My raid pretty much sucks. It is build it on the intel motherboard > LSI Megaraid. But i still get 81Mb/sec when doing > dd if=3D/dev/ar0 of=3D/dev/null bs=3D1M >=20 > How much do you get on this? geom_mirror on 2 desktop SATA drives, but the results of dd are pretty lo= w: # dd if=3D/dev/mirror/data of=3D/dev/null bs=3D1m count=3D1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 17.817686 secs (58850290 bytes/sec) As you can see, results with a single drive are better: # dd if=3D/dev/ad4 of=3D/dev/null bs=3D1m count=3D1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 16.219518 secs (64649023 bytes/sec) The mirror algorithm is "split": # gmirror list Geom name: data State: COMPLETE Components: 2 Balance: split Slice: 16384 Flags: NONE GenID: 0 SyncID: 1 ID: 1455065622 Providers: 1. Name: mirror/data Mediasize: 249999999488 (233G) Sectorsize: 512 Mode: r7w7e8 Consumers: 1. Name: ad4 Mediasize: 250000000000 (233G) Sectorsize: 512 Mode: r1w1e1 State: ACTIVE Priority: 0 Flags: DIRTY GenID: 0 SyncID: 1 ID: 2273811345 2. Name: ad6 Mediasize: 250000000000 (233G) Sectorsize: 512 Mode: r1w1e1 State: ACTIVE Priority: 0 Flags: DIRTY GenID: 0 SyncID: 1 ID: 926967552 Setting the algorithm back to "load" gives the performance similar to that of a single drive: # dd if=3D/dev/mirror/data of=3D/dev/null bs=3D1m count=3D1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 16.551914 secs (63350740 bytes/sec) It's really unusual that geom_mirror cannot benefit from splitting reques= ts. --------------enig4D33CC9435532B7BB57A0350 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFF7w7FldnAQVacBcgRAt/PAJ4w/yfGDX74ZsAPpW7CvMbtr2TOjwCgw3Fe WMTd/zsuDoIdwU23na/gw5g= =DtQB -----END PGP SIGNATURE----- --------------enig4D33CC9435532B7BB57A0350--