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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

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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