Re: [Xen-users] RE: Re: Xen 3.2 with shared IRQs

To:	"[STD]Ein" <ein@xxxxxxxxxxxxxx>
Subject:	Re: [Xen-users] RE: Re: Xen 3.2 with shared IRQs
From:	"Ben Holt" <beanjammin@xxxxxxxxx>
Date:	Sun, 10 Feb 2008 22:56:03 -0800
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Hmmm, turns out I celebrated too soon.  Crashed hard with "lost
interrupt" on hda and hdd this evening.

> How is the performance affected with shared irq's across domains?  Are you
> sharing heavily used irq's (nic's, ide controllers?).


I hadn't noticed a performance hit, but that's a purely subjective
opinion as I haven't done any proper measuring.

Unfortunately I have quite a few IRQs being shared between dom0 and
the two domUs that I have passed hardware to.  I'm using all 5 PCI
slots so I'm a bit limited in my options, though I am hopeful I can
get my IDE controller isolated on its own IRQ.

I'll post as I learn more...  and of course I'd appreciate any suggestions.

The only other boot options I'm using are dom0_mem on the dom0 and
swiotlb=force on the domU with a PVR150 and PVR500 (mpeg capture
cards) passed to it.  The swiotlb=force was necessary to get the
cards' ivtv driver to load.

- Ben

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Re: [Xen-users] RE: Re: Xen 3.2 with shared IRQs