Re: [Xen-users] xm top shows high CPU load on domU when passed PCI NICs after hypervisor update

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2012-07-26 at 21:26 +0100, Beanjammin H wrote:
> I am running a 64 bit dom0 with a stock Debian Squeeze xen hypervisor
> and kernel.  On top of this I am running a PV 32 bit domU that is
> passed two PCI network cards.  This set-up had been working well for
> over a year, however there was a recent hypervisor update so I
> rebooted the dom0.  Unfortunately now the domU that is being passed
> the two NICs is no longer able to create a PPPoe connection to my ISP
> and xm top show's it's CPU use consistently at 100%.  Suggestions on
> what I can do to trouble shoot this would be appreciated.  Here is
> what I have tried to date:
> 
> - Revert the hypervisor update (packages
> libxenstore3.0_4.0.1-4_amd64.deb
> xen-hypervisor-4.0-amd64_4.0.1-4_amd64.deb
> xenstore-utils_4.0.1-4_amd64.deb xen-utils-4.0_4.0.1-4_amd64.deb
> xen-utils-common_4.0.0-1_all.deb) and reboot the dom0, but this
> doesn't seem to make any difference, so perhaps the timing was a
> coincidence or I've missed reverting a package.

You might also need to try reverting any dom0 kernel updates which
happened in the interim as well?

Likewise domU.

> Searching through the mailing list and google in general hasn't turned
> up reports of a simliar issue.

There was one performance issue relating to swiotlb and bounce buffering
not so long ago. I'm hoping that Konrad (CCd) will remember the details.

What are the exact dom0 and domU kernel versions?

> Any suggestions would be greatly appreciated.
> 
> - Ben
> 
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