[Xen-devel] CPU Usage Discrepancies

["Pradeep Vincent" <pradeep.vincent@xxxxxxxxx>]

I see serious discrepancies between Cpu usage as reported by /proc/stat on Xen3
virts and Cpu usage as reported by the hypervisor via "xm" tool
(cpu_time). The problem exists on Intel and AMD platforms - 1 Vcpu and
multiple Vcpu slots - 1 Physical CPU and multiple Physical CPU hosts.

The skew is pronounced with workloads that "sleep-wake-sleep-wake" at
a high frequency while workloads that hog the CPU don't exhibit this
problem as much.

Anybody seen this ? Any insights ?

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=882 has all the details.

- Pradeep Vincent

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