From: Andrea Arcangeli <andrea@suse.de>
To: Peter Zaitsev <peter@mysql.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: VM Problems in 2.6.7 (Too active OOM Killer)
Date: Wed, 14 Jul 2004 06:10:26 +0200 [thread overview]
Message-ID: <20040714041026.GX974@dualathlon.random> (raw)
In-Reply-To: <1089776640.15336.2557.camel@abyss.home>
On Tue, Jul 13, 2004 at 08:44:02PM -0700, Peter Zaitsev wrote:
> The reason for me to disable swap both in 2.4 and 2.6 is - it really
> hurts performance. In some cases performance can be 2-3 times slower
> with swap file enabled. Using O_DIRECT and mlock() for buffers helps
> but not completely.
in 2.4 you can disable swap just fine (with oom killer disabled). until
I/somebody fix 2.6 you can workaround this problem while still avoiding
to swap much by setting /proc/sys/vm/swappiness to 0 or similar to tell
the VM "please don't swap" even if swap is enabled ;). That will still
prevent the oom killer to kick in. The oom killer is forbidden to run
as long as `free` tells you that >= 4k of swap are still available to the
OS. There are no other fundamental vm problems left I'm aware of in
latest 2.6 besides these no-swap and oom issues.
next prev parent reply other threads:[~2004-07-14 4:10 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-14 2:23 VM Problems in 2.6.7 (Too active OOM Killer) Peter Zaitsev
2004-07-14 2:40 ` William Lee Irwin III
2004-07-14 3:20 ` Peter Zaitsev
2004-07-14 3:17 ` Andrea Arcangeli
2004-07-14 3:44 ` Peter Zaitsev
2004-07-14 4:10 ` Andrea Arcangeli [this message]
2004-07-14 4:22 ` Andrew Morton
2004-07-14 4:47 ` Andrea Arcangeli
2004-07-14 4:17 ` Andrew Morton
2004-07-14 23:47 ` Peter Zaitsev
2004-07-14 22:44 ` Andrew Morton
2004-07-15 0:06 ` Andrea Arcangeli
2004-07-15 0:30 ` Peter Zaitsev
2004-07-15 0:46 ` Andrea Arcangeli
2004-07-15 1:54 ` William Lee Irwin III
2004-07-15 2:13 ` Peter Zaitsev
2004-07-15 2:33 ` William Lee Irwin III
2004-07-15 2:39 ` William Lee Irwin III
2004-07-15 2:44 ` William Lee Irwin III
2004-08-13 22:23 ` William Lee Irwin III
2004-07-19 20:27 ` Bill Davidsen
2004-07-18 16:13 ` Kurt Garloff
2004-07-20 9:14 ` R. J. Wysocki
2004-07-20 13:29 ` Andrea Arcangeli
2004-07-20 13:53 ` William Lee Irwin III
2004-07-20 13:29 ` William Lee Irwin III
2004-07-19 20:21 ` Bill Davidsen
2004-07-15 0:04 ` Andrea Arcangeli
2004-07-15 0:43 ` Peter Zaitsev
2004-07-15 0:43 ` William Lee Irwin III
2004-07-15 1:04 ` Peter Zaitsev
2004-07-15 1:29 ` William Lee Irwin III
2004-07-14 3:50 ` William Lee Irwin III
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