Hi, We have set up Xen on Fedora Core 5 Domain0 with a CentOS 5 HVM. This is a Dell Poweredge SC1430 system. We''ve set vcpus=2 and it will only see one CPU. I''ve also tried setting cpus="1,2" or "6,7" to no avail. Here''s what xm reports when I''ve set cpus="6,7". # xm vcpu-list Name ID VCPUs CPU State Time(s) CPU Affinity Domain-0 0 0 6 -b- 3304.1 any cpu Domain-0 0 1 1 -b- 245.0 any cpu Domain-0 0 2 0 -b- 198.5 any cpu Domain-0 0 3 5 -b- 901.3 any cpu Domain-0 0 4 4 -b- 192.6 any cpu Domain-0 0 5 2 -b- 236.0 any cpu Domain-0 0 6 0 r-- 240.8 any cpu Domain-0 0 7 3 -b- 200.9 any cpu vm2 67 0 7 -b- 45.2 6-7 vm2 67 1 - --p 0.0 6-7 The following is in vm2''s dmesg output, and I suspect the line about not detecting a SMP motherboard begins to point at the issue. Any thoughts on what''s up? Thanks. CPU: After generic identify, caps: 8fa9f9bf 00100000 00000000 00000000 0000e215 00000000 00000000 CPU: After vendor identify, caps: 8fa9f9bf 00100000 00000000 00000000 0000e215 00000000 00000000 CPU: L1 I cache: 32K, L1 D cache: 32K CPU: L2 cache: 4096K CPU: After all inits, caps: 8fa9f1bf 00100000 00000000 00000140 0000e215 00000000 00000000 Intel machine check architecture supported. Intel machine check reporting enabled on CPU#0. Checking ''hlt'' instruction... OK. SMP alternatives: switching to UP code Freeing SMP alternatives: 16k freed CPU0: Intel(R) Xeon(R) CPU E5310 @ 1.60GHz stepping 07 SMP motherboard not detected. Local APIC not detected. Using dummy APIC emulation. Brought up 1 CPUs -- - Kyle --------------------------------------------- kylet@panix.com http://www.panix.com/~kylet ---------------------------------------------