Re: Freebsd 5.2.1 Performance Woes

From: Kris Kennaway (kris_at_obsecurity.org)
Date: 09/30/04

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    Date: Wed, 29 Sep 2004 16:01:18 -0700
To: TM4525@aol.com

    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
    > 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?

    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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