RE: FreeBSD polling mode - count 'lost' packets?

From: Don Bowman (don_at_sandvine.com)
Date: 03/08/04

  • Next message: Adrian: "Best IDE RAID5 solution for FreeBSD 5.2 ?" 
    To: 'Karl Pielorz' <kpielorz@tdx.co.uk>, freebsd-isp@freebsd.org
Date: Mon, 8 Mar 2004 10:17:32 -0500

    From: Karl Pielorz [mailto:kpielorz@tdx.co.uk]
    > Hi All,
    >
    > We've been running a number of FreeBSD boxes with high packet
    > throughputs
    > using polling mode.
    >
    > This seems to work great (gets rid of 90k odd interrupts a second).
    >
    > Is there any easy way of finding out how many packets are
    > being 'dropped'
    > in this system? (We use em Intel Pro 1000TX cards) - as
    > obviously, there is
    > a finite limit to the number of packets the system can push -
    > is there any
    > mechanism, or flag, or anything that will warn you if by the time the
    > drivers get to poll the card, it's overflowed/lost packets?
    >
    > Thanks,

    netstat -i will tell you these things, look for ifInErrors, ifOutErrors.
    sysctl kern.polling will indicate if you can't poll fast enough.

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