From: Jens Axboe <axboe@suse.de>
To: Roy Sigurd Karlsbakk <roy@karlsbakk.net>
Cc: Mark Hahn <hahn@physics.mcmaster.ca>, linux-kernel@vger.kernel.org
Subject: Re: [BUG] RAID sub system
Date: Fri, 14 Dec 2001 17:53:03 +0100 [thread overview]
Message-ID: <20011214165303.GK1180@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.33.0112131525470.15231-100000@coffee.psychology.mcmaster.ca> <Pine.LNX.4.30.0112141448020.6153-100000@mustard.heime.net>
In-Reply-To: <Pine.LNX.4.30.0112141448020.6153-100000@mustard.heime.net>
On Fri, Dec 14 2001, Roy Sigurd Karlsbakk wrote:
> > my observation is this: once you use up all your free memory, you have
> > 30 seconds of reasonable behavior. 30 seconds is the the default dirty-buffer
> > age. are you tweaking /proc/sys/vm/bdflush at all? and no, I don't see
> > why your application would have dirty buffers in the first place -
> > I'm just noticing the ominous 30 seconds.
>
> More testing with bootparam mem=xxx shows this is it. When all memory is
> used, it fails to re-use old cache, or something.
sysrq-t output from a "hung" system would give some valuable info as to
why it's stuck.
--
Jens Axboe
next prev parent reply other threads:[~2001-12-14 16:53 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.33.0112131525470.15231-100000@coffee.psychology.mcmaster.ca>
2001-12-14 13:12 ` [BUG] RAID sub system Roy Sigurd Karlsbakk
2001-12-14 14:02 ` Roy Sigurd Karlsbakk
2001-12-14 16:53 ` Jens Axboe [this message]
2001-12-15 18:16 ` Roy Sigurd Karlsbakk
[not found] <Pine.LNX.4.33.0112131354490.15231-100000@coffee.psychology.mcmaster.ca>
2001-12-13 19:14 ` Roy Sigurd Karlsbakk
2001-12-13 19:44 ` Roy Sigurd Karlsbakk
2001-12-13 20:02 ` Roy Sigurd Karlsbakk
[not found] <Pine.LNX.4.33.0112131320350.15231-100000@coffee.psychology.mcmaster.ca>
2001-12-13 18:39 ` Roy Sigurd Karlsbakk
2001-12-13 17:24 [BUG?] RAID sub system / tux Roy Sigurd Karlsbakk
2001-12-13 17:55 ` [BUG] RAID sub system Roy Sigurd Karlsbakk
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