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Re: [Xen-devel] Re: softirq bound to cpus

On 15 Mar 2006, at 20:23, Tim Freeman wrote:

Looking more closely there does not seem to be a ksoftirqd equivalent: in entry.S, test_all_events is jumped to often via ret_from_intr. So it looks like the pending softirq requests are handled quite often and block until they are done. So I'm guessing the quote from the book does not apply so much (and these
deferrable functions in Xen need to be quite fast).

They occur fairly often, they are short in duration, and they often need to be executed on a particular CPU (that's true of the schedule and timer softirqs at least). Performance-wise, CPU affinity should win over any small resulting load imbalance.

 -- Keir

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