From: Andrea Arcangeli <andrea@suse.de>
To: David Schwartz <davids@webmaster.com>
Cc: Laurent Chavet <lchavet@av.com>, linux-kernel@vger.kernel.org
Subject: Re: Is there a way to turn file caching off ?
Date: Wed, 18 Apr 2001 21:00:00 +0200 [thread overview]
Message-ID: <20010418210000.H30770@athlon.random> (raw)
In-Reply-To: <3ADD4E61.A2A9CE9@av.com> <NCBBLIEPOCNJOAEKBEAKOEPOOGAA.davids@webmaster.com>
In-Reply-To: <NCBBLIEPOCNJOAEKBEAKOEPOOGAA.davids@webmaster.com>; from davids@webmaster.com on Wed, Apr 18, 2001 at 11:21:46AM -0700
On Wed, Apr 18, 2001 at 11:21:46AM -0700, David Schwartz wrote:
>
>
> [..] If we assume the caching isn't helping [..]
If you know kernel data cache doesn't help your workload at all then you want
use O_DIRECT at least to save the CPU. You can run 2.4.4pre3aa3 or apply the
rawio-3 patch and then the o_direct-2 patch on top of 2.4.4pre3 if you want
O_DIRECT support (it also fixes the O_SYNC wait for locked inode bug noticed by
Marcelo).
You will find detailed explanation on the O_DIRECT feature and where to
find the patches if you grep for subject O_DIRECT in the l-k list in the
messages of this month.
Andrea
next prev parent reply other threads:[~2001-04-18 18:45 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3ADD4E61.A2A9CE9@av.com>
2001-04-18 18:21 ` Is there a way to turn file caching off ? David Schwartz
2001-04-18 19:00 ` Andrea Arcangeli [this message]
2001-04-17 16:37 Laurent Chavet
2001-04-18 4:56 ` David Schwartz
2001-04-18 11:49 ` Bjorn Wesen
2001-04-18 13:43 ` Jeremy Jackson
2001-04-19 8:21 ` Helge Hafting
2001-04-19 16:15 ` Jeremy Jackson
2001-04-19 18:01 ` John Lenton
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