Date: Wed, 07 Mar 2007 20:13:09 +0100 From: Ivan Voras <ivoras@fer.hr> To: freebsd-stable@freebsd.org Cc: freebsd-geom@freebsd.org Subject: Re: Some Unix benchmarks for those who are interesed Message-ID: <esn2s6$1i9$1@sea.gmane.org> In-Reply-To: <005b01c760e6$9a798bf0$0c00a8c0@Artem> References: <20070306020826.GA18228@nowhere> <45ECF00D.3070101@samsco.org><20070306050312.GA2437@nowhere><008101c75fcc$210c74a0$0c00a8c0@Artem> <esk9vq$uhh$1@sea.gmane.org><001a01c7601d$5d635ee0$0c00a8c0@Artem> <eskka8$adn$1@sea.gmane.org><001801c7603a$5339e020$0c00a8c0@Artem> <eskpd1$sm4$1@sea.gmane.org> <20070307105144.1d4a382f@daydream.goid.lan><002801c760e2$5cb5eb50$0c00a8c0@Artem> <esmvnp$khs$1@sea.gmane.org> <005b01c760e6$9a798bf0$0c00a8c0@Artem>
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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--
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