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[Xen-users] Xen 3.0 and SMP

  • To: <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Alan Greenspan" <alan@xxxxxxxxxxx>
  • Date: Thu, 19 May 2005 12:20:05 -0400
  • Delivery-date: Thu, 19 May 2005 16:21:56 +0000
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

Questions about the roadmap for 3.0 and SMP?
Can a domU be a larger SMP than the underlying host, e.g. can one make a 5-way domU on a 4-way host?   If not, what are the constraints on the #CPU for an SMP domU.
How do SMP domUs get scheduled?   For example, if there are 2 2-way domUs running on a 2-way host, can both domUs be running simultaneously (1 CPU from each) or does each SMP domU get scheduled en mass, using both host CPUs when running at all times?
What is the expected loss in performance of running a domU with identical SMP characteristics to its host?   In other words,  if running a single 4-way domU on a 4-way host, what would one expect the performance loss to be?
Can an SMP domU migrate to a host with less cpus, more cpus?
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