[libvirt] Need help for thesis on Xen - disabling HAP for benchmarking purposes

Daniel P. Berrange berrange at redhat.com
Wed Mar 25 19:44:34 UTC 2009

On Tue, Mar 24, 2009 at 09:10:24AM +0100, Alexander Sascha wrote:
> Hi,
> I'm a German student, writing my thesis on "Virtualization with Xen. 
> Analysis and Comparision of Different Techniques such as 
> Paravirtualization, Full Virtualization, and Utilization of Hardware 
> Support Provided by the Processor".
> I'd like to know how I can disable HAP/RVI/Nested Paging for 
> benchmarking purposes. I read somewhere 
> (http://markmail.org/message/bbnivuqx6vjz7jg4) that Xen developers 
> decided to disable the global grub parameter introducing a per domain 
> flag for HAP instead (hap=0/1).

There's no  way to set this per domain in libvirt. IMHO it was crazy
to remove the global boot parameter for it :-(

On the other hand, XenD is all python code so trivially modified. So you
could easily edit the XenD python code to turn HAP on/off globally when
running your benchmarking tests.

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