VMware ESXi - varying CPU time (CPU reservation)

Posted by Tomo on Server Fault See other posts from Server Fault or by Tomo
Published on 2009-10-22T20:38:38Z Indexed on 2010/12/23 21:56 UTC
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vmware

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freebsd

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cpu

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time

Hello!

I'm running FreeBSD 7.2 under VMware ESXi 3.5. Host has 2 physical CPUs and the BSD box is currently the only running VM. Only one virtual CPU is assigned to the VM.

When measuring CPU time of a specific program, I get very different results from time to time. Processor usage is reported differently by VMware, based on the system load. Is it possible to assign a constant share of a physical CPU to specific VM? I would like the CPU time to be more or less much constant. I tried setting CPU reservation when configuring VM in the VMware Infrastructure Client, but the CPU time still varies a lot.

Thanks in advance!

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