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Date: Wed, 9 Jan 2002 15:03:56 +0100 (CET)
From: Roy Sigurd Karlsbakk <roy@karlsbakk.net>
To: Jens Axboe <axboe@suse.de>
cc: Mark Hahn <hahn@physics.mcmaster.ca>, <linux-kernel@vger.kernel.org>
Subject: Re: [BUG] Error reading multiple large files
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> > It seemed like it helped first, but after a while, some 99 processes went
> > Defunct, and locked. After this, the total 'bi' as reported from vmstat
> > went down to ~ 900kB per sec
>
> Bad news for Andrew's patch, however I really don't think it would have
> helped you much in the first place. The problem seems to be down to
> loosing read-ahead when cache ends up eating all of available memory,
> I've seen this effect myself too. Maybe the vm needs to be more
> aggressive about tossing out pages when this happens, I'm quite sure
> that would help tremendously for this workload.

Thanks for answering. I'm really close to giving up and have already
started testing on *BSD unices.

It seems reasonable if that (tossing old pages) could be the problem.

Thanks, guys

--
Roy Sigurd Karlsbakk, MCSE, MCNE, CLS, LCA

Computers are like air conditioners.
They stop working when you open Windows.

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