ESXi

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  • 1.  Question around CPU Base Frequency

    Posted May 25, 2023 02:20 AM
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    Hi,

    I have set up a new ESXi 7 server and notice that my VMs under this server are reporting an incorrect CPU Base Frequency.  My server is running 2 Intel Xeon Gold 6242 CPU @ 2.80Ghz, however, Geekbench is telling me that my VM's CPU Base Frequency is only 1.39Ghz.

    I have already disabled the Power Management Settings in BIOS, any other settings I could have missed?

    Simon



  • 2.  RE: Question around CPU Base Frequency

    Posted May 25, 2023 02:55 PM

    Have you tried changing the power management settings in the host client? Not sure it can be done from vSphere, but in the host client, it's under Host  -> Manage -> Hardware tab -> Power Management. Change the policy to "High performance".



  • 3.  RE: Question around CPU Base Frequency

    Posted May 29, 2023 03:14 AM

    Changed to High Performance but it's the same.  I Ran Geekbench 6 and still scored 740 on a single core.



  • 4.  RE: Question around CPU Base Frequency

    Posted May 29, 2023 02:08 PM

    Hello,

    I'm not sure about this, but could it be because of hyperthreading is enabled on the host ?



  • 5.  RE: Question around CPU Base Frequency

    Posted May 30, 2023 01:40 PM

    Definitely need to check out any additional power/frequency settings that may be present in the BIOS/EFI.  Also, once setting the hypervisor to Max Performance, you do need to reboot.

    Some other things to consider and look into.  Do you have CPU/Memory HotAdd enabled?  Do you have 1 socket per core configured?  How many vCPU's to you have configured to the VM?  Do you have CPU Ready or CoStop on the host?

    There's a number of reasons why a vCPU may not have access to the full frequency of a pCPU, and in most cases this is just fine due to the abstraction and how things work in the hypervisor.