Odd news transit performance problem

From: Dave Williams (dave_at_uk.clara.net)
Date: 12/20/04

  • Next message: Ollie Cook: "Re: Odd news transit performance problem" 
    To: freebsd-performance@freebsd.org
Date: Mon, 20 Dec 2004 18:24:49 +0000

    Folks,

     we're seeing a somewhat puzzling scenario with a FreeBSD 4.9RC
    box of an October '03 vintage kernel. The box is currently running
    innd for news transit, and in circumstances of heavy traffic load
    performance on the machine drops through the floor.

    Various reporting tools (systat, vmstat, top, etc) report that the
    box is idle - there's no significant contention for memory, disk,
    network, etc. that we can see and actually bouncing the box seems
    to bring performance back up to speed again for a period - restarting
    innd doesn't have the same effect.

    The machine is a 2.8GHz Xeon, Intel 10/100 and 1000 NICs,
    is running with two onboard LSI 53C{mumble} scsi controllers,
    device polling enabled, HZ=1000, and MAXDSIZ set to 1GB
    and MAXSSIZ/DFLDSIZ. We're a bit stumped as to where to look
    at the moment. :(

    Thanks
    Dave 

    -- 
Dave Williams
dave@uk.clara.net
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  • Next message: Ollie Cook: "Re: Odd news transit performance problem"