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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 0 of 5] v2: Nested-p2m cleanups and locking changes
At 14:15 +0100 on 27 Jun (1309184128), Tim Deegan wrote: > At 14:23 +0200 on 27 Jun (1309184586), Christoph Egger wrote: > > > - Why is there a 10x increase in IPIs after this series? I don't see > > > what sequence of events sets the relevant cpumask bits to make this > > > happen. > > > > In patch 1 the code that sends the IPIs was outside of the loop and > > moved into the loop. > > Well, yes, but I don't see what that causes 10x IPIs, unless the vcpus > are burning through np2m tables very quickly indeed. Maybe removing the > extra flushes for TLB control will do the trick. I'll make a patch... Hmmm, on second thoughts, we can't remove those flushes after all. The np2m is in sync with the p2m but not with the guest-supplied p2m, so we do need to flush it when the guest asks for that to happen. Tim. -- Tim Deegan <Tim.Deegan@xxxxxxxxxx> Principal Software Engineer, Xen Platform Team Citrix Systems UK Ltd. (Company #02937203, SL9 0BG) _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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