Re: [Xen-devel] xen-unstable qemu-upstream: pci-passthrough timing issues due to commit 0f7b2864d0d0c3ef2801f9214d8c510c80a220d1 when vnc enabled

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Sat, 20 Apr 2013, Sander Eikelenboom wrote:
> Hi Gerd,
> 
> Using qemu-upstream with pci-passthrough on xen-unstable previously worked 
> fine.
> Since commit 0f7b2864d0d0c3ef2801f9214d8c510c80a220d1 (bisected) i see what i 
> think are timing issues (video device is reporting buffer underruns).
> 
> Since that commit changes vnc code, i have disabled vnc (was default enabled, 
> but i did not use it).
> Disabling vnc by using vnc=0 and nographic make thinks work like before.

Are you sure that the bug is related to Xen PCI passthrough (it doesn't
happen if you don't assign any devices to the Xen guest)?
I am asking because the Xen PCI passthrough code doesn't use any timers,
while this looks like something related to timer and refresh
intervals...

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