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[Xen-devel] SMP guest support in unstable tree.

The unstable tree now includes support for SMP guests, i.e.
domains which run on multiple cpus.  SMP guests can use between
1 and 32 virtual cpus, even if the machine has fewer physical cpus.
The code is highly experimental and performance will improve over

To use SMP guests:
- enable option CONFIG_SMP in the Linux 2.6 kernel config
- dom0 will boot with upto the number of physical cpus in the machine.
- domU will boot with as many cpus as has been configured by setting
  the XEN_VCPUS environment variable in xend's environment.
- the number of cpus used can be reduced by using the maxcpus= option
  on the Linux kernel command line.


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