Date: Fri, 2 Feb 2007 05:33:56 +1100 From: Peter Jeremy <peterjeremy@optushome.com.au> To: Ian FREISLICH <if@hetzner.co.za> Cc: Robert Huff <roberthuff@rcn.com>, freebsd-current@freebsd.org Subject: Re: Interesting speed benchmarks Message-ID: <20070201183356.GE909@turion.vk2pj.dyndns.org> In-Reply-To: <E1HC8QK-0000Px-P5@hetzner.co.za> References: <peterjeremy@optushome.com.au> <20070130231210.GR892@turion.vk2pj.dyndns.org> <E1HC8QK-0000Px-P5@hetzner.co.za>
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--EuxKj2iCbKjpUGkD Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, 2007-Jan-31 07:54:24 +0200, Ian FREISLICH wrote: >As a random datapoint that might or might not be related. In the >last year or so I was pontificating about how much better SCSI was >that IDE/ATA to my boss. I then did some benchmarks on my (CURRENT) >system and discovered that an old 10Gig 7.5krpm UDMA33 disk >significantly out perform some Seagate Cheatah LVD 10krpm disks. I have access to a Sun V20z at work: mpt0: <LSILogic 1030 Ultra4 Adapter> port 0x2000-0x20ff mem 0xfe850000-0xfe= 85ffff,0xfe840000-0xfe84ffff irq 27 at device 4.0 on pci2 mpt0: [GIANT-LOCKED] mpt0: MPI Version=3D1.2.15.0 mpt0: Capabilities: ( RAID-1E RAID-1 SAFTE ) mpt0: 0 Active Volumes (1 Max) mpt0: 0 Hidden Drive Members (6 Max) da0 at mpt0 bus 0 target 0 lun 0 da0: <FUJITSU MAW3073NC 0103> Fixed Direct Access SCSI-3 device=20 da0: 320.000MB/s transfers (160.000MHz, offset 127, 16bit), Tagged Queueing= Enabled da0: 70136MB (143638992 512 byte sectors: 255H 63S/T 8941C) da1 at mpt0 bus 0 target 1 lun 0 da1: <FUJITSU MAW3073NC 0103> Fixed Direct Access SCSI-3 device=20 da1: 320.000MB/s transfers (160.000MHz, offset 127, 16bit), Tagged Queueing= Enabled da1: 70136MB (143638992 512 byte sectors: 255H 63S/T 8941C) Whilst the drives are geom mirrored, running in "prefer" mode forces all reads to come off the first drive (iostat/systat verify this) and I get: # df -ki /home Filesystem 1K-blocks Used Avail Capacity iused ifree %i= used Mounted on /dev/mirror/gm0s1f 38999124 13440472 22438724 37% 273895 4766231 = 5% /home # dump -0aL -f /dev/null -C 32 /home DUMP: DUMP: 13671011 tape blocks on 1 volume DUMP: finished in 906 seconds, throughput 15089 KBytes/sec Note that I've only just mirrored this system that everything has been very recently restored which might give an optimistic result but this is still way above what I'm seeing on my ATA system at home or what Robert is seeing. >Last time I looked, ahc(4) was still under GIANT. The ATA system >has had a significant overhaul. mpt(4) is also under giant and still gives a good account of itself. --=20 Peter Jeremy --EuxKj2iCbKjpUGkD Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (FreeBSD) iD8DBQFFwjKU/opHv/APuIcRAriwAKC1NNMjWi3zz16nvJR0RTZjP/xiUACfXo0L ZE7pUsqJKJjRZko1lv7taKI= =RuZ/ -----END PGP SIGNATURE----- --EuxKj2iCbKjpUGkD--
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