High usage of mbufs

From: Michael VInce (mv_at_roq.com)
Date: 05/28/05

  • Next message: Mike Horwath: "Re: High usage of mbufs" 
    Date: Sat, 28 May 2005 13:17:24 +1000
To: freebsd-performance@freebsd.org

    Hi guys
    On one of my web servers I have a really high usage of mbuf clusters in
    use on a web server that does about 3million hits a day.
    4294914731/262144 mbuf clusters in use (current/max)
    Does any one know why this is? I was thought it may of been hit by a
    small syn flood that went un noticed and that the current mbuf stat is
    failing to update its real usage, but the number does move every time I
    run netstat -m
    This is a dual P4 machine with 4gigs of ram that was setup before 5.4
    was release, so it could be considered 5.3 stable.
    5.4-PRERELEASE #0: Mon Feb 28 20:01:43 EST 2005

    netstat -m
    352955 mbufs in use
    4294914731/262144 mbuf clusters in use (current/max)
    0/27/6656 sfbufs in use (current/peak/max)
    4177412 KBytes allocated to network
    0 requests for sfbufs denied
    0 requests for sfbufs delayed
    415 requests for I/O initiated by sendfile
    2300 calls to protocol drain routines

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  • Next message: Mike Horwath: "Re: High usage of mbufs"