[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] Interrupt to CPU routing in HVM domains - again
> 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. Would I need to do a specific bind_vcpu hypercall to cause an event channel to be bound to a vcpu != 0? I'm not doing that. I'm thinking that Bart is seeing some weird interaction somewhere that is causing the change that should break things to somehow make things work... James _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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