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2V0-621 · Question #159

An administrator is troubleshooting a CPU performance issue for a virtual machine. Which three esxtop counters may demonstrate CPU contention? (Choose three.)

The correct answer is A. %RDY C. %MLMTD E. %CSTP. CPU contention in esxtop is identified by counters that show a VM is being denied, throttled, or delayed from receiving CPU time rather than actively executing.

Section 7 – Administer and Analyze vSphere 6.x Performance

Question

An administrator is troubleshooting a CPU performance issue for a virtual machine. Which three esxtop counters may demonstrate CPU contention? (Choose three.)

Options

  • A%RDY
  • B%RUN
  • C%MLMTD
  • D%WAIT
  • E%CSTP

How the community answered

(53 responses)
  • A
    77% (41)
  • B
    15% (8)
  • D
    8% (4)

Why each option

CPU contention in esxtop is identified by counters that show a VM is being denied, throttled, or delayed from receiving CPU time rather than actively executing.

A%RDYCorrect

%RDY (Ready) measures the percentage of time the VM was ready to execute but could not be scheduled onto a physical CPU, which is the most direct indicator of CPU contention.

B%RUN

%RUN shows the proportion of time the VM was actively running on a physical CPU, which measures utilization rather than any form of CPU scheduling delay or contention.

C%MLMTDCorrect

%MLMTD (MLB Limited) indicates the percentage of time the VM's CPU usage was artificially capped by a configured CPU limit setting, representing resource-imposed contention.

D%WAIT

%WAIT reflects time the VM spent in a guest-level idle or I/O wait state, which is not a CPU scheduling contention metric.

E%CSTPCorrect

%CSTP (Co-Stop) reflects the percentage of time a multi-vCPU VM was stalled waiting for all its vCPUs to be simultaneously co-scheduled, a form of SMP scheduling contention.

Concept tested: esxtop CPU contention counter identification

Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.monitoring.doc/GUID-7B49F1EE-CF81-4E23-A1C6-6EDC8CA8AB0C.html

Topics

#%RDY#%CSTP#%MLMTD#CPU contention counters

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