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    SubjectRe: irqbalance mandatory on SMP kernels?
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    On Mon, 2006-04-17 at 07:31 -0700, Martin J. Bligh wrote:
    > Robert M. Stockmann wrote:
    > > Hi,
    > >
    > > I noticed that the latest editions of RedHat EL 4.3 and direct
    > > descendants today need a program called irqbalance to activate
    > > true SMP IRQ load balancing for your machine's hardware.
    > >
    > > If one boots a SMP kernel (2.4.xx or 2.6.xx) kernel on a machine
    > > which either has 2 or more physical CPU's (also dual-core CPU's)
    > > , and one does not start up the irqbalance util from the
    > > kernel-utils package ( see e.g.
    >
    > There is an in-kernel IRQ balancer. Redhat just choose to turn it
    > off, and do it in userspace instead. You can re-enable it if you
    > compile your own kernel.

    Round-robin IRQ balancing is inefficient anyway. You'd get better cache
    utilization letting one CPU take them all.

    Lee

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