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Date: Wed, 29 Sep 2004 16:01:18 -0700
From: Kris Kennaway <kris@obsecurity.org>
To: TM4525@aol.com
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References: <fa.2e69790.2e8c8879@aol.com>
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cc: freebsd-questions@freebsd.org
Subject: Re: Freebsd 5.2.1 Performance Woes
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On Wed, Sep 29, 2004 at 05:51:53PM -0400, TM4525@aol.com wrote:
> While I was had a nice little test set up, I figured I'd test Freebsd 4.9=
=20
> against 5.2.1 since I had fresh installs handy on separate drives.
> The simple test was as follows:
>=20
> Hardware:
>=20
> Celeron 2.4Ghz processor
> Dual onboard Intel (em) NICs, 32bit, 33Mhz bus
>=20
> Setup:
>=20
> Traffic Generator -> FreeBSD System -> Server
>=20
> I had it set up to route between the 2 interfaces (ie NOT bridged). I
> fired a unidirectional stream of UDP packets (so there was no return traf=
fic
> from the server, which was discarding the packets) at a rate of ~100Kpps.=
=20
> The disturbing results:
>=20
> FreeBSD 4.9: 33% interrupt usage
> FreeBSD 5.2.1: >80% interrupt usage
>=20
> What has happened to the stack?=20

See the Early Adopter's Guide that was distributed with 5.2.1, or just
don't worry about it and update to 5.3 which has vastly better network
performance.

Kris
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