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Re: [Xen-devel] Re: softirq bound to cpus
| To: | Tim Freeman <tfreeman@xxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Re: softirq bound to cpus |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Wed, 15 Mar 2006 22:15:20 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Wed, 15 Mar 2006 22:18:31 +0000 |
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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 thesedeferrable 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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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