Re: [BUG] RAID sub system

From: Jens Axboe (
Date: Fri Dec 14 2001 - 11:53:03 EST

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

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