[Xen-devel] cpuid bit for relaxed timer handling?

[Andrew Lyon <andrew.lyon@xxxxxxxxx>]

Hi,

I understand that with Xen 3.4 viridian=1 can be specified in the
configugration file to enable viridian support, one of the effects of
which is to set a cpuid bit to enable relaxed timers, I was wondering
if the same bit could be set using the cpuid= setting on older
versions of Xen?

I run Xen 3.2.1 and find that under heavy load my Windows 2008 and
Vista VM's will BSOD with CLOCK_WATCHDOG_TIMEOUT (101), this is pretty
inconvenient on its own but if the VM has a pci passthrough device the
entire system will lock up when this happens, the same lockup happens
if I destroy a VM which has a passthrough device.

I have tried running Xen unstable but when I install gplpv drivers my
windows vm's BSOD with a 7E, I really need the performance boost of
gplpv drivers or I would simply run unstable with no pv drivers.

Andy

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