When to start CPU contention?

I have a core eight ESX 3.5.0 server running about 25 VM.

Usually, the server runs with 40% CPU usage.

At what time would you expect vying for CPU come into play?

What is the best way to control the CPU contention?

Thank you

Steve

Your understanding of contention made CPU fault... it is NOT a direct consequence of vSMP exclusively.

If you load 100 100% active single CPU VMs on a host of 8 cores, you would end up with submission and high when they're ready, no matter if made them vSMP or not.  Certainly, vSMP increases significantly the liklihood of restraint and high when they're ready, but it is not the only (or even primary) contributor.

To the OP - theres no individual number because it depends on your vCPU mixture and the activity of the virtual machines themselves.  For OUR environment, we try to keep it under 70%, but this is only a valid number for OUR CA.  Your, in all liklihood, will be different.

-Matt

VCP, vExpert, Unix Geek

Tags: VMware

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