From: "Miquel van Smoorenburg" <miquels@cistron.nl>
Subject: experiences with 2.5.40 on a busy usenet news server
Date: Tue, 8 Oct 2002 08:46:20 +0000 (UTC)
Organization: Cistron
Message-ID: <anu60s$oev$1@ncc1701.cistron.net>
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Originator: miquels@cistron-office.nl (Miquel van Smoorenburg)
To: linux-kernel@vger.kernel.org
Sender: linux-kernel-owner@vger.kernel.org
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Just FYI:

So I booted 2.5.40 with the raid0 fix on our usenet news peering
server yesterday. It is a box that exchanges binary feeds with
about 40 peers, 400 GB/day in, 600 GB/day out.

It's a dual PIII/450, 1 GB RAM, 4x18 GB article spool directly
on partitions (not raw, but normal partitions). INN-2.4/CNFS.

With 2.4.19, it runs fine. With 2.5.40, it goes wildly into
swap. I'm assuming the I/O is pushing the newsserver binaries
and database mappings into swap.

# free
             total       used       free     shared    buffers     cached
Mem:       1033308    1027316       5992          0     836884      29776
-/+ buffers/cache:     160656     872652
Swap:       976888     364032     612856

No need to swap 364 MB when there's 872 MB still free...
This makes the machine dogslow. An 'expire' process that
runs every night normally takes 15 minutes to finish now
has been running for 10 hours and its still not finished.

Article acceptance rate has halved, the machine can't keep up
with the binaries it is fed.

I'm going to risk corrupting the databases and reboot back
to 2.4.19 now.

Mike.

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