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Date:      Wed, 29 Sep 2004 17:51:53 EDT
From:      TM4525@aol.com
To:        freebsd-questions@freebsd.org
Subject:   Freebsd 5.2.1 Performance Woes
Message-ID:  <fa.2e69790.2e8c8879@aol.com>

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While I was had a nice little test set up, I figured I'd test Freebsd 4.9 
against 5.2.1 since I had fresh installs handy on separate drives.
The simple test was as follows:

Hardware:

Celeron 2.4Ghz processor
Dual onboard Intel (em) NICs, 32bit, 33Mhz bus

Setup:

Traffic Generator -> FreeBSD System -> Server

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 traffic
from the server, which was discarding the packets) at a rate of ~100Kpps. 
The disturbing results:

FreeBSD 4.9: 33% interrupt usage
FreeBSD 5.2.1: >80% interrupt usage

What has happened to the stack? 



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