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Re: [Xen-devel] 2.6.27 - SMP enabled, but only 1 CPU


  • To: xen devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Christopher S. Aker" <caker@xxxxxxxxxxxx>
  • Date: Mon, 03 Nov 2008 15:30:08 -0500
  • Delivery-date: Mon, 03 Nov 2008 12:30:34 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

Christopher S. Aker wrote:
I just compiled 2.6.27 (pae) using my .config from 2.6.26. It boots fine, but only one CPU shows up, despite "vcpus = 4" and all of the SMP goodness enabled. This happens on both Xen 3.2.x and 3.3.x (64 bit hypervisor).

beefcake:2.6.27-linode14# grep SMP .config
CONFIG_X86_SMP=y
CONFIG_X86_32_SMP=y
CONFIG_USE_GENERIC_SMP_HELPERS=y
CONFIG_SMP=y
CONFIG_X86_FIND_SMP_CONFIG=y
# CONFIG_X86_VSMP is not set
CONFIG_PM_SLEEP_SMP=y

root@ubuntu:~# uname -a
Linux ubuntu 2.6.27-linode14 #1 SMP Sun Oct 12 20:34:47 EDT 2008 i686 GNU/Linux
root@ubuntu:~# cat /proc/cpuinfo
processor    : 0
...
(and that's it -- just one CPU)

I must be missing something obvious, so I'd appreciate another set of eyes on this. My .config, boot log, and xen.conf are located here:

http://www.theshore.net/~caker/xen/2.6.27-linode14/config.txt
http://www.theshore.net/~caker/xen/2.6.27-linode14/bootlog.txt
http://www.theshore.net/~caker/xen/2.6.27-linode14/xen.conf

Same with 2.6.27.4 and a defconfig + the paravirt stuff enabled. So, what's the trick for getting SMP working with 2.6.27.* domUs? Has anyone achieved this?

Thanks,
-Chris


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