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

[Andrew Lyon <andrew.lyon@xxxxxxxxx>]

On Mon, Feb 23, 2009 at 1:19 PM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
> Unfortunately it's not that easy since Xen's own CPUID leaves are in the way
> and have to be relocated. Also if you advertise Viridian support in CPUID
> then you also have to implement some hypervisor service calls.

I had a feeling it would'nt be as simple as that.
>
> Perhaps your best bet is to see if James Harper knows anything about BSODs
> with GPLPV drivers on latest xen-unstable, and try to get that working?

You are right, I want to move to unstable anyway.. there are other
features I would like to try out and I think I've got to the stage
where I can handle running unstable Xen on my workstation.

Thanks Keir.
Andy

>
>  -- Keir
>
> On 23/02/2009 05:02, "Andrew Lyon" <andrew.lyon@xxxxxxxxx> wrote:
>
>> 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
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-devel
>
>
>

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