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    SubjectRe: Although CONFIG_IRQBALANCE is enabled IRQ's don't seem to be balanced very well
    On 1/10/06, Martin Bligh <> wrote:
    > Josef Sipek wrote:
    > > On Tue, Jan 10, 2006 at 12:14:42PM +0100, Jesper Juhl wrote:
    > >
    > >>Do I need any userspace tools in addition to CONFIG_IRQBALANCE?
    > >
    > >
    > > Last I checked, yes you do need "irqbalance" (at least that's what
    > > the package is called in debian.
    > Nope - you need the kernel option turned on OR the userspace daemon,
    > not both.
    Ok, good to know.

    > If you're not generating interrupts at a high enough rate, it won't
    > rotate. That's deliberate.

    Hmm, and what would count as "a high enough rate"?

    I just did a small test with thousands of ping -f's through my NIC
    while at the same time giving the disk a good workout with tons of
    find's, sync's & updatedb's - that sure did drive up the number of
    interrupts and my load average went sky high (amazingly the box was
    still fairly responsive):

    root@dragon:/home/juhl# uptime
    22:59:58 up 12:43, 1 user, load average: 1015.48, 715.93, 429.07

    but, not a single interrupt was handled by CPU1, they all went to CPU0.

    Do you have a good way to drive up the nr of interrupts above the
    treshhold for balancing?

    Jesper Juhl <>
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