On Tue, 2016-12-06 at 14:01 -0800, Stefano Stabellini wrote: > On Tue, 6 Dec 2016, Stefano Stabellini wrote: > > > > moving a vCPU with interrupts assigned to it is slower than moving > > a > > vCPU without interrupts assigned to it. You could say that the > > slowness is directly proportional do the number of interrupts > > assigned > > to the vCPU. > > To be pedantic, by "assigned" I mean that a physical interrupt is > routed > to a given pCPU and is set to be forwarded to a guest vCPU running on > it > by the _IRQ_GUEST flag. The guest could be dom0. Upon receiving one > of > these physical interrupts, a corresponding virtual interrupt (could > be a > different irq) will be injected into the guest vCPU. > > When the vCPU is migrated to a new pCPU, the physical interrupts that > are configured to be injected as virtual interrupts into the vCPU, > are > migrated with it. The physical interrupt migration has a cost. > However, > receiving physical interrupts on the wrong pCPU has an higher cost. > Yeah, I got in what sense you said "assigned", but thanks anyway for this clarification. It indeed makes the picture more clear (even just FTR) :-)
Dario -- <<This happens because I choose it to happen!>> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
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