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xen-devel
[Xen-devel] Re: Xen 4.1 interrupts not delievered.
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To: |
Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Bruce Edge <bruce.edge@xxxxxxxxx>, <Ray.Lin@xxxxxxx>, <linux@xxxxxxxxxxxxxx>, <caker@xxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, <m.a.young@xxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, <pasik@xxxxxx> |
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Subject: |
[Xen-devel] Re: Xen 4.1 interrupts not delievered. |
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From: |
Keir Fraser <keir@xxxxxxx> |
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Date: |
Wed, 13 Oct 2010 00:34:58 +0100 |
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Tue, 12 Oct 2010 16:36:04 -0700 |
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Xen 4.1 interrupts not delievered. |
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On 12/10/2010 18:17, "Konrad Rzeszutek Wilk" <konrad.wilk@xxxxxxxxxx> wrote:
> A couple of that might fix the problems are:
>
> 1). Ian's fix to the event channels:
> http://xenbits.xen.org/gitweb?p=people/ianc/linux-2.6.git;a=commit;h=5d30cb2a8
> 5912ffb5f6556d55472c26801eef2ea
> 2). Disable IRQ balancing in Xen (and also in Linux kernel). "noirqbalance"
> 3). Pin domains, but nothing to Domain 0.
ITYM cpu 0. Not that this should rightly make any difference that I can see.
My suspicion would be the per-CPU IDT patches introduced during 4.0
development. Or changes to enable deep C-state sleeps by default. One or the
other causing lost interrupts. I think the latter can be discounted by
max_cstate=1 as a Xen boot parameter. The former would require trying a
build of Xen before and after changesets 20072/20073 -- they are the ones
that did the heavy lifting to implement per-CPU IDTs.
-- Keir
> But it might be worth trying them out?
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