From: "Gérard Roudier" <groudier@free.fr>
To: Daniel Phillips <phillips@bonn-fries.net>
Cc: <pcg@goof.com>, Rik van Riel <riel@conectiva.com.br>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Roger Larsson <roger.larsson@skelleftea.mail.telia.com>,
<linux-kernel@vger.kernel.org>
Subject: Re: [resent PATCH] Re: very slow parallel read performance
Date: Sun, 26 Aug 2001 22:26:49 +0200 (CEST) [thread overview]
Message-ID: <20010826220717.E16170-100000@gerard> (raw)
In-Reply-To: <20010826172310Z16216-32383+1477@humbolt.nl.linux.org>
On Sun, 26 Aug 2001, Daniel Phillips wrote:
[...]
> It should not be being ignored. This needs to be looked into. In any event,
> the max-readahead proc setting is clearly good and needs to be in Linus's
> tree, otherwise changing the default MAX_READAHEAD requires a recompile.
> Worse, there is no way at all to specify the kernel's max-readahead for scsi
> disks - regardless of the fact that scsi disks do their own readahead, the
> kernel will do its own as well, with no way for the user to turn it off.
For SCSI disks prefetch tuning you may look into the CACHING page.
For example, you can tell the drive to stop prefetching as soon a command
is ready by setting MINIMUM PRE-FETCH to zero.
Unfortunately, not all SCSI disks allow to tune all the configuration
parameters of the caching page.
[...]
Gérard.
next prev parent reply other threads:[~2001-08-26 20:29 UTC|newest]
Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-23 21:35 Lehmann
2001-08-24 7:35 ` [resent PATCH] " Roger Larsson
2001-08-24 17:43 ` Rik van Riel
2001-08-24 18:28 ` Roger Larsson
2001-08-24 19:02 ` Rik van Riel
2001-08-24 20:37 ` Gérard Roudier
2001-08-24 23:12 ` Rik van Riel
2001-08-25 8:02 ` Gérard Roudier
2001-08-25 9:26 ` Roger Larsson
2001-08-25 11:49 ` Gérard Roudier
2001-08-25 17:56 ` Roger Larsson
2001-08-25 19:13 ` Gérard Roudier
2001-08-25 13:17 ` Rik van Riel
2001-08-24 22:29 ` Daniel Phillips
2001-08-24 23:10 ` Rik van Riel
2001-08-25 0:42 ` Daniel Phillips
2001-08-27 7:08 ` Helge Hafting
2001-08-27 14:31 ` Daniel Phillips
2001-08-27 14:42 ` Alex Bligh - linux-kernel
2001-08-27 15:14 ` Rik van Riel
2001-08-27 16:04 ` Daniel Phillips
[not found] ` <Pine.LNX.4.33L.0108271213370.5646-100000@imladris.rielhome.cone ctiva>
2001-08-27 19:34 ` Alex Bligh - linux-kernel
2001-08-27 20:03 ` Oliver Neukum
2001-08-27 20:19 ` Alex Bligh - linux-kernel
2001-08-27 21:38 ` Oliver.Neukum
2001-08-27 22:26 ` Alex Bligh - linux-kernel
2001-08-27 21:29 ` Daniel Phillips
2001-08-27 16:02 ` Daniel Phillips
2001-08-27 19:36 ` Alex Bligh - linux-kernel
2001-08-27 20:24 ` Daniel Phillips
2001-08-27 16:55 ` David Lang
2001-08-27 18:54 ` Daniel Phillips
2001-08-27 18:37 ` Oliver Neukum
2001-08-27 19:04 ` Daniel Phillips
2001-08-27 19:43 ` Oliver Neukum
2001-08-27 20:37 ` Daniel Phillips
2001-08-27 22:10 ` Oliver.Neukum
2001-08-27 21:44 ` Linus Torvalds
2001-08-27 22:30 ` Daniel Phillips
2001-08-27 23:00 ` Marcelo Tosatti
2001-08-28 3:10 ` Linus Torvalds
2001-08-27 19:55 ` Richard Gooch
2001-08-27 20:09 ` Oliver Neukum
2001-08-27 21:06 ` Daniel Phillips
2001-08-24 20:18 ` Daniel Phillips
2001-08-24 20:19 ` Rik van Riel
2001-08-24 21:11 ` Daniel Phillips
2001-08-24 23:03 ` Rik van Riel
2001-08-25 0:41 ` Daniel Phillips
2001-08-25 1:34 ` Rik van Riel
2001-08-25 15:49 ` Daniel Phillips
2001-08-25 15:50 ` Rik van Riel
2001-08-25 16:28 ` Lehmann
2001-08-25 16:34 ` Rik van Riel
2001-08-25 16:41 ` Lehmann
2001-08-26 16:55 ` Daniel Phillips
2001-08-26 18:39 ` Rik van Riel
2001-08-26 19:46 ` Daniel Phillips
2001-08-26 19:52 ` Rik van Riel
2001-08-26 20:08 ` Daniel Phillips
2001-08-26 22:33 ` Russell King
2001-08-26 23:24 ` Daniel Phillips
2001-08-26 23:24 ` Russell King
2001-08-27 0:07 ` Rik van Riel
2001-08-27 0:02 ` Rik van Riel
2001-08-27 0:42 ` Daniel Phillips
2001-08-25 16:43 ` Daniel Phillips
2001-08-25 19:15 ` Alan Cox
2001-08-25 19:35 ` Lehmann
2001-08-25 20:52 ` Rik van Riel
2001-08-26 1:38 ` Daniel Phillips
2001-08-26 2:49 ` Lehmann
2001-08-26 17:29 ` Daniel Phillips
2001-08-26 17:37 ` Craig I. Hagan
2001-08-26 18:56 ` Rik van Riel
2001-08-26 19:18 ` Lehmann
2001-08-26 21:07 ` Daniel Phillips
2001-08-26 22:12 ` Rik van Riel
2001-08-26 23:24 ` Lehmann
2001-08-26 20:26 ` Gérard Roudier [this message]
2001-08-26 21:20 ` Daniel Phillips
2001-08-26 3:32 ` Rik van Riel
2001-08-26 13:22 ` Lehmann
2001-08-26 13:48 ` Rik van Riel
2001-08-26 14:55 ` Lehmann
2001-08-26 15:06 ` Rik van Riel
2001-08-26 15:25 ` Lehmann
2001-08-25 21:33 ` Alan Cox
2001-08-25 23:34 ` Lehmann
2001-08-26 2:02 ` Rik van Riel
2001-08-26 2:57 ` Lehmann
2001-08-26 0:46 ` John Stoffel
2001-08-26 1:07 ` Alan Cox
2001-08-26 3:30 ` Rik van Riel
2001-08-26 3:40 ` Rik van Riel
2001-08-26 5:28 ` Daniel Phillips
2001-08-24 23:23 ` Lehmann
[not found] ` <200108242344.f7ONi0h21270@mailg.telia.com>
2001-08-25 0:28 ` Lehmann
2001-08-25 3:09 ` Rik van Riel
2001-08-25 9:13 ` Gérard Roudier
2001-08-26 16:54 ` Daniel Phillips
2001-08-26 18:59 ` Victor Yodaiken
2001-08-26 19:38 ` Rik van Riel
2001-08-26 20:05 ` Victor Yodaiken
2001-08-26 20:34 ` Rik van Riel
2001-08-26 20:45 ` Victor Yodaiken
2001-08-26 21:00 ` Alan Cox
2001-08-26 20:42 ` Daniel Phillips
2001-08-26 19:31 ` Lehmann
2001-08-24 19:42 ` Lehmann
2001-08-24 21:42 ` Gérard Roudier
2001-08-25 0:05 ` Craig I. Hagan
2001-08-27 2:03 Rick Hohensee
2001-08-27 2:52 ` Keith Owens
2001-08-28 17:52 ` Kai Henningsen
2001-08-28 21:54 ` Matthew M
2001-08-28 1:08 Dieter Nützel
2001-08-28 0:05 ` Marcelo Tosatti
2001-08-28 1:54 ` Daniel Phillips
2001-08-28 5:01 ` Mike Galbraith
2001-08-28 18:18 ` Andrew Morton
2001-08-28 18:45 ` Hans Reiser
2001-08-28 15:28 Dieter Nützel
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