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Re: [Xen-devel] Patch: implementing least priority interrupt routing
| To: | Juergen Gross <juergen.gross@xxxxxxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Patch: implementing least priority interrupt routing |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Tue, 18 Nov 2008 10:10:47 +0000 |
| Cc: | |
| Delivery-date: | Tue, 18 Nov 2008 02:11:13 -0800 |
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| Thread-topic: | [Xen-devel] Patch: implementing least priority interrupt routing |
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On 18/11/08 09:59, "Juergen Gross" <juergen.gross@xxxxxxxxxxxxxxxxxxx> wrote: > the attached patch implements interrupt routing to least priority processor > for HVM domains. > Instead of round robin the vcpu with the lowest processor priority is selected > for the interrupt. If multiple vcpus share the same low priority interrupts > are distributed between those round robin. > Tested with BS2000 domain (3 vcpus, idle processors are now preferred > interrupt target). Where idle means 'not processing an interrupt'. Which ought to be by far the most common case even for a non-idle CPU. Does this really improve load balancing all that much? Does BS2000 spend lots of time in IRQ context? My fear is that extra complexity here slows down dest_lowprio for all OSes (and it's used by a lot of OSes) for every ExtInt delivered. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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