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@xxxxxxxxxx +1-801-349-2682 Libvirt virtualization library http://libvirt.org -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list