Re: Odd performance problem (hitching)

From: Don Lewis (truckman_at_FreeBSD.org)
Date: 08/31/05

  • Next message: Jon Dama: "Re: Application layer firewall on FreeBSD, is it possible ?" 
    Date: Tue, 30 Aug 2005 18:55:05 -0700 (PDT)
To: doconnor@gsoft.com.au

    On 31 Aug, Daniel O'Connor wrote:
    > On Tuesday 30 August 2005 17:50, Daniel O'Connor wrote:
    >> > You might try significantly decreasing MAXVNODES_MAX in
    >> > sys/kern/vfs_subr.c and rebuilding your kernel.
    >>
    >> OK..
    >> I'll try timing when the drop outs happen :)
    >
    > Hmm they appear to be every 10 seconds on the dot.

    Hmn, I wonder what runs every 10 seconds ...

    > I haven't changed any syncer delay stuff either..
    > kern.filedelay: 30
    > kern.dirdelay: 29
    > kern.metadelay: 28

    Those won't make any difference. They govern how many slots behind in
    the worklist that items of various types get inserted. The syncer wakes
    up once per second, processes all the items in a worklist slot, then
    goes back to sleep. The syncer vnode for each file system gets inserted
    when the file system is mounted and stays in the same slot, so the ugly
    FOREACH loop I mentioned earlier gets executed once each time the entire
    worklist is scanned, and since the worklist has 32 slots, the problem
    should only occur once every 32 seconds if you have one file system that
    has hogged most of the vnodes. If there are multiple file systems, the
    syncer vnodes will inserted at various power of two locations in the
    list, but I don't see a way to get activity spaced at ten second
    intervals.

    > Still using SCHED_4BSD too.
    >

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