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SubjectRe: irqbalance mandatory on SMP kernels?
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.


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