From: Dave Jones <davej@suse.de>
To: Linux Kernel <linux-kernel@vger.kernel.org>
Cc: andrea@suse.de, davej@codemonkey.org.uk
Subject: Possible O_DIRECT problems ?
Date: Fri, 21 Dec 2001 00:08:06 +0000 [thread overview]
Message-ID: <20011221000806.A26849@suse.de> (raw)
Andrea, lk,
I just experimented with O_DIRECT in conjunction with fsx,
and the results aren't pretty.
Over NFS it survives around 921 operations, all local filesystems
(ext2,ext3,reiser tested) just 6 operations.
I've put the source to a modified fsx at
http://www.codemonkey.org.uk/cruft/fsx-odirect.c
It's possible I've done something wrong here, so look it over.
Just adding O_DIRECT flag to open() should be all thats necessary
correct ?
Also note, that by changing the flags on line 988 to have O_DIRECT
also, we get different failure type.
So, did I get the usage of O_DIRECT correct and find some bugs,
or have I had a little too much xmas spirits already ? 8-)
Dave.
--
| Dave Jones. http://www.codemonkey.org.uk
| SuSE Labs .
next reply other threads:[~2001-12-21 0:06 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-21 0:08 Dave Jones [this message]
2001-12-21 0:23 ` Possible O_DIRECT problems ? Trond Myklebust
2001-12-21 0:39 ` Dave Jones
[not found] ` <w53ellp2out.wl@megaela.fe.dis.titech.ac.jp>
2001-12-21 12:46 ` Trond Myklebust
2001-12-21 16:14 ` Chuck Lever
2001-12-21 16:04 ` Chuck Lever
2001-12-29 15:25 ` Andrea Arcangeli
2001-12-29 18:46 ` CJ
2001-12-30 5:39 ` Andre Hedrick
2001-12-30 11:16 ` Gérard Roudier
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