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Re: [Xen-devel] Interrupt to CPU routing in HVM domains - again
| To: | John Levon <levon@xxxxxxxxxxxxxxxxx>, James Harper <james.harper@xxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Interrupt to CPU routing in HVM domains - again |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Fri, 05 Sep 2008 08:44:23 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx, bart brooks <bart_brooks@xxxxxxxxxxx> |
| Delivery-date: | Fri, 05 Sep 2008 00:44:52 -0700 |
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| Thread-topic: | [Xen-devel] Interrupt to CPU routing in HVM domains - again |
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On 5/9/08 02:21, "John Levon" <levon@xxxxxxxxxxxxxxxxx> wrote: >> Have I understood correctly that only cpu 0 of the vcpu_info[] array is >> ever used even if the interrupt actually occurs on another vcpu? Is this >> true for all versions of Xen? It seems that Bart's experience is exactly >> the opposite of mine - the change that fixed up the performance issues >> for me caused performance issues for him... > > I was just in this code. From what I can tell it's a requirement that > all the domU's event channels be bound to VCPU0, since there's no code > in Xen itself that will redirect evtchn_pending_sel from another VCPU to > CPU0's vcpu_info, and the callback IRQ code assumes VCPU0. Yes, this is very likely the problem being observed. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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