FreeBSD 5.x performance tips (ISC)

From: Peter Losher (Peter_Losher_at_isc.org)
Date: 01/13/04

  • Next message: Robert Watson: "Re: FreeBSD 5.x performance tips (ISC)" 
    Date: Mon, 12 Jan 2004 22:41:19 -0800
To: performance@freebsd.org

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    So, as many of you know ISC hosts a quad-Xeon server running FreeBSD 5.1
    (-p10 to be precise) which hosts half of ftp.freebsd.org, etc. Many of
    you helped out with some teething pains w/ virtual memory sizes, and
    kernel panics. Thanks :)

    The issue with the system now is that while the kernel is SMP-aware, and
    as I watch 5.2-REL get downloaded today, this system is like the arm
    muscle that is developed to lift that barbell, but not enough blood is
    getting everywhere, so the barbell is slowly moving up while the muscle
    cramps like hell. In this case the system is ~70% idle, and around 150
    processes are locked and the performance starts to seriously decrease
    at times. (Entropy stops getting collected, etc.) Not a pretty sight.
    The CPU's are all spinlocking on an I/O channel. so high I/O translates
    into artificial high cpu and load averages.

    So where can I look for pointers on how I can squeeze better performance
    out of this configuration? I already have the usual sysctl entries
    installed. Any chance moving to 5.2 will help the situation?

    Best Wishes - Peter
    - --
    Peter_Losher@isc.org | ISC | OpenPGP Key E8048D08 | "The bits must flow"
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  • Next message: Robert Watson: "Re: FreeBSD 5.x performance tips (ISC)"