[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Xen cpu Scheduling
Hi, xentop gets information from runstate (see vcpu_runstate_change()) Please check it. Thanks Atsushi SAKAI pak333@xxxxxxxxxxx wrote: > Hi, > > I have some questions on scheduling. > > 1. Suppose I give a VM 2 vcpus. When this VM gets scheduled will it always be > given two pcpus or can it be given 1vcpu also sometimes. For example if we > have mutiple VMs running, and if a cpu gets freed up will my 2vcpu VM be > scheduled on this single free cpu. If a single cpu cna be given how is the > cpu % calculated by xentop > > 2. If the 2vcpu is scheduled on two cpus, and one of its threads goes to > sleep can that single thread be context swtiched out. or will it be kept > spinning. > > 3. When xentop reports VM cpu% as say 167% what does that mean. is it the % > of time for the 2 vcpus (that means the VM is using 167% of the 200% it was > allotted, or is the 167% of the number of pcpus in the system), or is it 167% > of the total number of vcpus. > > Thanks much for answering my questions > > - Prabha _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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