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Re: [libvirt] [PATCH 12/12] food for thought



On 10/06/2010 06:18 PM, Eric Blake wrote:
Xen is more complex than I first thought.

I'm debating whether to support xendConfigVersion <= 2 (xm_internal.h)
or just xendConfigVersion >= 3 (xend_internal.h).

RHEL 5.5 uses xendConfigVersion==2, so that answers the question (although not in the way I was expecting - more work before I'm ready to post).


Additional things I've discovered:

http://lists.xensource.com/archives/html/xen-devel/2009-11/msg01061.html

documents that the config file (xm_internal.h) has two parameters, vcpus
is the max, and vcpu_avail is a bitmask of which vcpus to enable at
boot. I'm assuming that xen cannot support more than 32 vcpus?

I confirmed in the xen source that there is a cap of 32 vcpus for paravirt machines, at least per the MAX_VIRT_CPUS macro as used in libvirt.

--
Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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