Some Xen performance data related to the xen-acpi-processor patchset

[Stefan Bader]

On 16.05.2012 17:30, Tim Gardner wrote:
> On 05/16/2012 09:18 AM, Andy Whitcroft wrote:
>> On Wed, May 16, 2012 at 05:05:12PM +0200, Stefan Bader wrote:
>>> We got a request[1] to backport some patches which will disable the usual
>>> frequency scaling drivers and add a new xen specific one that will make
>>> callbacks into the hypervisor to enable p-state control (the hypervisor
>>> has no acpi table parser but needs to make those decisions).
>>>
>>> I have been playing with the proposed patches[2] on an Intel i7 and one AMD
>>> Opteron 6128 based system. And finally I also got around to write some CPU
>>> intensive test (adding numbers in a loop for each visible VCPU) that gathers the
>>> runtime statistics.
>>
>> These fixes are all already in Quantal and enabled by default.  So any
>> testing we do there helps to validate them also.
>>
>> [...]
>>
>> -apw
>>
>>
>>
> 
> It would also be good to compare your xen-acpi branch non-cherrypick
> patches to upstream to make sure they didn't get munged. Otherwise, it
> seems like testing indicates these are worthwhile.
> 
> rtg

I should re-push it after dropping the debugging cruft to make it simpler to
review. iirc, there was not so much backporting needed but adapting some makefile...

-Stefan


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