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RE: [Xen-devel] RE: Rather slow time of Pin in Windows with GPL PVdriver

To: "Paul Durrant" <Paul.Durrant@xxxxxxxxxx>, "MaoXiaoyun" <tinnycloud@xxxxxxxxxxx>
Subject: RE: [Xen-devel] RE: Rather slow time of Pin in Windows with GPL PVdriver
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Thu, 10 Mar 2011 20:30:27 +1100
Cc: xen devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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Thread-topic: [Xen-devel] RE: Rather slow time of Pin in Windows with GPL PVdriver
> You have to be careful here. Xen will only ever deliver the evtchn
> to VCPU0. I can't immediately see anything preventing an HVM domain
trying to
> bind and evtchn to another VCPU but you can see from the code in
> hvm_assert_evtchn_irq() that the guest will only be kicked for events
bound to
> VCPU0 (is_hvm_pv_evtchn_vcpu() will only be true for Linux PVonHVM
> Thus if you bind your DPC to a CPU other than zero and don't set it to
> HighImportance then it will not be immediately scheduled since default
> importance is MediumImportance.

Are you sure? That's not what I remember seeing. You always have to
query shared_info_area->vcpu_info[0] not
shared_info_area->vcpu_info[vcpu], but the actual VCPU the interrupt is
scheduled onto can be any.


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