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Re: [Xen-users] PCI Passthrough - Write-back to unknown field

On Thu, Jul 27, 2017 at 01:38:36PM +0300, Ivan Radevici wrote:
> Thank you for your reply!
> Here is the output of vcpu-list
> sudo xl vcpu-list
> Name                                ID  VCPU   CPU State   Time(s) Affinity
> (Hard / Soft)
> Domain-0                             0     0    0   -b-      75.7 0 / all
> Domain-0                             0     1    1   r--      76.8 1 / all
> win2k                                1     0    2   -b-      78.5 2 / all
> win2k                                1     1    3   -b-      69.2 3 / all
> but the card still fails the test. Also, it looks like cores are mainly in
> idle, so probably problem is not there
> While I was trying to pin vcpus I remembered about PV on HVM. There was a
> chart somewhere in wiki, where it was shown that interrupts and timers have
> poor performance on fully virtualised guests. This also may be a cause for
> this behaviour. I am thinking about trying PVHVM (or just simple PV) drivers
> for Windows2000, if I'll find some. How do you think, may it help?

There's no such thing as PVHVM for Windows, this is only available for
Linux/FreeBSD. AFAIK on Windows you can only add the PV drivers for
block and network. Might be worth a try, but I doubt it's going to fix
your PCI card issues.

> Any other options?

Try on another box maybe? Your box seems to be missing quite a lot of
IOMMU features, so I guess it's kind of oldish hardware?

Maybe on newer hardware you will no longer see the timeouts, although
it's very hard to tell what's going on exactly without knowing what
the driver is actually doing (or why it's failing exactly).


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