From: Chris Wedgwood <cw@f00f.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andrew Morton <andrewm@uow.edu.au>,
Andreas Dilger <adilger@turbolinux.com>,
"Albert D. Cahalan" <acahalan@cs.uml.edu>,
Ben LaHaise <bcrl@redhat.com>,
Ragnar Kjxrstad <kernel@ragnark.vestdata.no>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
mike@bigstorage.com, kevin@bigstorage.com, linux-lvm@sistina.com
Subject: Re: [PATCH] 64 bit scsi read/write
Date: Mon, 16 Jul 2001 05:10:46 +1200 [thread overview]
Message-ID: <20010716051046.A10956@weta.f00f.org> (raw)
In-Reply-To: <E15LL3Y-0000yJ-00@the-village.bc.nu>
In-Reply-To: <E15LL3Y-0000yJ-00@the-village.bc.nu>
On Sat, Jul 14, 2001 at 09:45:44AM +0100, Alan Cox wrote:
As far as I can tell none of them at least in the IDE world
Can you test with the code I posted a hour or so ago please?
I ask this because I tested writes to:
-- buffered devices
-- ide with caching on
-- ide with caching off
-- scsi (caching on?)
To a buffered device, I get something silly like 63000
writes/second. No big surprises there (other than Linux is bloody lean
these days).
To a SCSI device (10K RPM SCSI-3 160 drive), I get something like 167
writes/second, which seems moderately sane if caching is disabled.
To a cheap IDE drive (5400 RPM?) with caching off, I get about 87
writes/second.
To the same drive, with caching on, I get almost 4000 writes/second.
This seems to imply, at least for my test IDE drive, you can turn
caching off --- and its about half as fast as my SCSI drives which
rotate at about twice the speed (sanity check).
IDE drive: IBM-DTTA-351010, ATA DISK drive
SCSI drive: SEAGATE ST318404LC
--cw
next prev parent reply other threads:[~2001-07-15 17:11 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-01 4:53 [RFC][PATCH] first cut 64 bit block support Ben LaHaise
2001-07-03 4:53 ` Ragnar Kjørstad
2001-07-04 2:19 ` [PATCH] 64 bit scsi read/write Ben LaHaise
2001-07-04 7:11 ` Alan Cox
2001-07-05 6:34 ` Ragnar Kjørstad
2001-07-05 7:35 ` Ben LaHaise
2001-07-13 18:20 ` Albert D. Cahalan
2001-07-13 20:41 ` Andreas Dilger
2001-07-13 21:07 ` Chris Wedgwood
2001-07-13 22:04 ` Andreas Dilger
2001-07-14 0:49 ` Jonathan Lundell
2001-07-14 12:27 ` Paul Jakma
2001-07-14 14:48 ` Chris Wedgwood
2001-07-14 15:42 ` Paul Jakma
2001-07-14 17:18 ` Chris Wedgwood
2001-07-20 17:03 ` Stephen C. Tweedie
2001-07-16 18:53 ` Andreas Dilger
2001-07-16 19:13 ` Ragnar Kjørstad
2001-07-13 21:14 ` Alan Cox
2001-07-14 3:23 ` Andrew Morton
2001-07-14 8:45 ` Alan Cox
2001-07-14 14:50 ` Chris Wedgwood
2001-07-14 20:11 ` Daniel Phillips
2001-07-15 1:21 ` Andrew Morton
2001-07-15 1:53 ` Daniel Phillips
2001-07-15 3:36 ` Chris Wedgwood
2001-07-15 6:05 ` John Alvord
2001-07-15 6:07 ` Chris Wedgwood
2001-07-15 13:16 ` Ken Hirsch
2001-07-15 14:50 ` Chris Wedgwood
2001-07-15 22:14 ` Daniel Phillips
2001-07-17 0:31 ` Juan Quintela
2001-07-15 13:44 ` Daniel Phillips
2001-07-15 14:39 ` Chris Wedgwood
2001-07-15 15:32 ` Alan Cox
2001-07-15 15:33 ` Chris Wedgwood
2001-07-15 16:24 ` Chris Wedgwood
2001-07-15 15:06 ` Jonathan Lundell
2001-07-15 15:22 ` Chris Wedgwood
2001-07-15 17:44 ` Jonathan Lundell
2001-07-15 17:47 ` Justin T. Gibbs
2001-07-15 23:14 ` Rod Van Meter
2001-07-16 0:37 ` Jonathan Lundell
2001-07-16 15:11 ` Rod Van Meter
2001-07-16 8:56 ` Chris Wedgwood
2001-07-16 13:19 ` Daniel Phillips
2001-07-16 1:08 ` Albert D. Cahalan
2001-07-16 8:49 ` Chris Wedgwood
2001-07-21 19:18 ` Alexander Griesser
2001-07-22 3:52 ` Albert D. Cahalan
2001-07-23 14:41 ` Daniel Phillips
2001-07-24 4:29 ` Albert D. Cahalan
2001-07-24 11:45 ` Daniel Phillips
2001-07-14 15:41 ` Jonathan Lundell
2001-07-14 17:00 ` Chris Wedgwood
2001-07-14 17:33 ` Jonathan Lundell
2001-07-15 4:02 ` Chris Wedgwood
2001-07-15 5:46 ` Jonathan Lundell
2001-07-15 17:10 ` Chris Wedgwood [this message]
2001-07-15 17:39 ` Jonathan Lundell
2001-07-26 2:18 ` Ragnar Kjørstad
2001-07-26 16:24 ` Andreas Dilger
2001-08-10 19:42 ` Ben LaHaise
2001-08-10 19:51 ` Ragnar Kjørstad
2001-08-10 20:02 ` Ben LaHaise
2001-08-11 0:18 ` Steve Lord
2001-08-11 21:44 ` Matti Aarnio
2001-07-04 10:16 ` [RFC][PATCH] first cut 64 bit block support Chris Wedgwood
2001-07-04 16:59 ` Ben LaHaise
2001-07-14 15:08 [PATCH] 64 bit scsi read/write Ed Tomlinson
2001-07-19 7:35 [PATCH] 64 bit SCSI read/write Andre Hedrick
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