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M. Belali

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high CPU ready while low vcpu ratio

Hi,

We have an esx 6 server with 2 x 8 core cpu's and a total of 32 logical cores.

On this server we have 4 vm's. See below for the number of vcpu for each.

VM1: 1 vcpu (linux)
VM2: 1 vcpu (windows server 2012 R2)
VM3: 8 vcpu (windows server 2012 R2)
VM4: 10 vcpu (windows server 2012 R2)

How is it possible that sometimes we experience cpu ready times of 4% to 10%?

That shouldn't be the case for this amount of available logical cpu's and this amount of provisioned CPU's..

Any help is very welcome.

Thanks.
Avatar of Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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Do you have performance issues ? more information and logs required.
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M. Belali

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Hi,

Yes we have performance issues. What kind of information do you need?
ASKER CERTIFIED SOLUTION
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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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Hi,

Yesterday evening we did the following:
Turned off the VM's and restarted the host. In Bios we checked the power setting for the CPU, this was not set to performance, we changed this to performance setting. This morging (till now, 14:30 pm) the average cpu ready is back to "normal" 1% to 1,5%, a lot better then yesterday. Also no permorance issues today.

Could a CPU power setting have this big impact in this case? Didn't experience this before, even with servers with CPU power setting not set to performance.

We will monitor other I/O the coming days.
Yes, you need to make sure your BIOS settings are as per recommended VMware settings in the guidance documents.

(and also changed in vSphere as well as the BIOS!)
Thanks!