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xen-devel
RE: [Xen-devel] Re: VM hung after running sometime
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To: |
<jeremy@xxxxxxxx> |
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Subject: |
RE: [Xen-devel] Re: VM hung after running sometime |
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From: |
MaoXiaoyun <tinnycloud@xxxxxxxxxxx> |
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Date: |
Wed, 29 Sep 2010 14:01:22 +0800 |
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xen devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, keir.fraser@xxxxxxxxxxxxx |
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Tue, 28 Sep 2010 23:02:21 -0700 |
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Well， I just go throught the source of irqbalance, it shows that it balances the irq through
updating /proc/irq/$irq/smp_affinity. That, in my understanding, set irq affinity is almost
equal to irq migration.
I later find the NIC interrupt is not modified in dom0, so it is safe to set its affinity,
but interrupt of xen event use handle_level_irq, set its affinity will subject to irq
lost.
Am I right?
> Date: Tue, 28 Sep 2010 10:07:28 -0700
> From: jeremy@xxxxxxxx
> To: tinnycloud@xxxxxxxxxxx
> CC: xen-devel@xxxxxxxxxxxxxxxxxxx; keir.fraser@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Re: VM hung after running sometime
>
> On 09/28/2010 04:23 AM, MaoXiaoyun wrote:
> >
> > Is it safe to set irq affinity(including NIC, domain event, etc) manually?
> > Will it cause irq lost?
>
> There's only a very small chance of a lost interrupt, especially if the
> device is mostly idle at the time. The event can only be lost if:
>
> 1. it is handling a device interrupt
> 2. you migrate it to another cpu
> 3. another interrupt comes in before the first one has finished
> processing
>
> J
>
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