[CentOS-virt] Xen 3.1.2 on CentOS 5.5 doesn't see all 4 CPUs

Thu Jun 3 17:16:10 UTC 2010
Bryan A. Ignatow <bryan at ignatow.org>

Not looking to run Windows guests... so no problem there.  And a free
server beats $60 any day :-)

By the way, I have another one that is just about the same (4 x P-III
900Mhz and 16GB) running ESXi 3.5 U5 like a champ with no problems, so I
was hoping to get Xen up on this one (for a project I need to test out Xen

And no, I have not explored KVM on there yet... even though I did load it.
 I'm really just interested in Xen right now.


> Well, I can't say for sure the reason why it doesn't see all cpus, but I
> do
> know a P-III system is not going to support virtualization technology, so
> you would never be able to run windows guests on it. Only systems sold in
> the last year or two support VT. And motherboards that do support it are
> fairly cheap - starting in the $60 range.
> Anywho, have you tried KVM instead?
> -----Original Message-----
> From: centos-virt-bounces at centos.org
> [mailto:centos-virt-bounces at centos.org]
> On Behalf Of Bryan A. Ignatow
> Sent: Thursday, June 03, 2010 10:27 AM
> To: Discussion about the virtualization on CentOS
> Subject: [CentOS-virt] Xen 3.1.2 on CentOS 5.5 doesn't see all 4 CPUs
> Hello all,
> I've been digging around on this for a few days and I have not come up
> with
> a solution.
> I have a Compaq ProLiant DL580 (G1, the old tan Compaq) with 4 x 700MHz
> P-III CPUs and 11GB of memory.  I've loaded CentOS 5.5 with Virtualization
> (Xen) + KVM and patched up to current (full KS packages file list at the
> end).
> When it boots, Xen only detects a single CPU as shown in the xm dmesg
> output
> (full output and the end):
> (XEN) Detected 701.650 MHz processor.
> (XEN) I/O virtualisation disabled
> (XEN) CPU0: Intel Pentium III (Cascades) stepping 04
> (XEN) Platform timer overflows in 2 jiffies.
> (XEN) Platform timer is 1.193MHz PIT
> (XEN) Brought up 1 CPUs
> [...]
> (XEN) Dom0 has maximum 1 VCPUs
> The system shows all 4 CPUs when booted outside of Xen.
> Any ideas on Xen options or anything I can try to see if I can get all 4
> CPUs?
> Thanks,
> Bryan
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Bryan A. Ignatow
bryan at ignatow.org