Messages in this thread | | | Subject | Re: irqbalance mandatory on SMP kernels? | From | Lee Revell <> | Date | Mon, 17 Apr 2006 11:01:33 -0400 |
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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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