I have a machine on which the xen kernel sees only 1 core on a AMD X2 5400+ cpu. I just took this cpu out of another machine on which I had xen installed and xen saw both cores on that machine. I''ve tried 3 different AMD dual core cpus, all different speeds and models, and the same thing happens with all three. The MB is a Biostar TA770 A2+. It has a setting in the BIOS for enabling virtualization, and that is enabled. Has anyone else run across a situation like this before and, if so, what was your fix? I''m assuming the motherboard is the problem, but hoping maybe there is another fix. This is a pure 64-bit Lenny install with Xen 3.2-1 installed from all Debian packages. When I remove all xen packages from the system and boot back into the default amd64 kernel in Lenny both cores are recognized. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users