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2V0-621 · Question #172

Refer to the Exhibit. Examine the esxtop command output shown in the Exhibit. Which option would improve application performance for the SlowVM virtual machine?

The correct answer is D. Increase the CPU limit assigned to SlowVM.. When esxtop shows a high %MLMTD (percent of time the VM is CPU-limited) value for a virtual machine, the correct fix is to raise or remove the CPU limit that is throttling it.

Section 7 – Administer and Analyze vSphere 6.x Performance

Question

Refer to the Exhibit. Examine the esxtop command output shown in the Exhibit. Which option would improve application performance for the SlowVM virtual machine?

Exhibit

2V0-621 question #172 exhibit

Options

  • AIncrease the number of vCPUs provided to SlowVM.
  • BDecrease the number of vCPUs provided to SlowVM.
  • CMove SlowVM to another ESXi host with more physical CPU resources available.
  • DIncrease the CPU limit assigned to SlowVM.

How the community answered

(42 responses)
  • A
    17% (7)
  • B
    7% (3)
  • C
    26% (11)
  • D
    50% (21)

Why each option

When esxtop shows a high %MLMTD (percent of time the VM is CPU-limited) value for a virtual machine, the correct fix is to raise or remove the CPU limit that is throttling it.

AIncrease the number of vCPUs provided to SlowVM.

Adding vCPUs does not help when the bottleneck is a CPU limit, because the additional vCPUs will also be throttled and the co-scheduling overhead may increase Co-Stop time.

BDecrease the number of vCPUs provided to SlowVM.

Decreasing the vCPU count reduces the VM's maximum potential CPU throughput and does nothing to address the limit-induced throttling shown in the esxtop output.

CMove SlowVM to another ESXi host with more physical CPU resources available.

Migrating to another host does not remove the CPU limit configuration, which is set on the virtual machine object itself and travels with it on migration.

DIncrease the CPU limit assigned to SlowVM.Correct

The %MLMTD counter in esxtop indicates the percentage of time a VM is being held below its potential CPU usage due to a configured CPU limit. Increasing or removing that limit allows the scheduler to allocate more CPU cycles to SlowVM, directly improving application throughput.

Concept tested: Diagnosing and resolving VM CPU limits using esxtop %MLMTD

Source: https://docs.vmware.com/en/VMware-vSphere/6.7/vsphere-esxi-vcenter-server-671-resource-management-guide.pdf

Topics

#esxtop#CPU limit#performance analysis#resource throttling

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