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[Xen-devel] How to get the accurate physical CPU utilization in Dom0?

  • To: xen-devel <xen-devel@xxxxxxxxxxxxx>
  • From: Bei Guan <gbtju85@xxxxxxxxx>
  • Date: Thu, 27 Feb 2014 23:06:14 +0800
  • Delivery-date: Thu, 27 Feb 2014 15:06:36 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>


I run a PV DomU with 1 vcpu on Xen. I pin the vcpu to a physical CPU core, such as core 3. Then, I run a cpu-bound process in DomU and the vcpu utilization is 100% (got it with "xentop" in Dom0).
However, when I use "top" in Dom0 to see the physical CPU utilization, the CPU core 3 utilization is zero or less than 1%. The utilization expected of CPU core 3 is also 100% like the vcpu. Is it? Why I cannot get the accurate physical CPU utilization with "top" command in Dom0?

Any advice is appreciated. Thank you for your time.

Best Regards,
Bei Guan
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