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Hypervisor overhead
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Hypervisor overhead

With KVM, if the VPS is using a steady 20% CPU as measured from within the VM, what is the actual CPU usage to the host? Does the hypervisor add another 5%? 10%?

Comments

  • ralfralf Member

    Depends a lot on your situation and how many cores your host has, but I'd say it's probably close to zero impact on CPU, and maybe a small amount on IO as that'll introduce at least an additional memory copy on the host.

    I don't run anywhere close to stressing the machine in general use, but when I first got my dedi I ran YABS and the results on a guest VM and on the host itself were pretty comparable (except IIRC the guest VM crashed every time when I ran geekbench on a VM using all the cores, but was fine only using 15 of the 16).

    Thanked by 1skippy
  • skippyskippy Member
    edited January 9

    I suspect the hypervisor on the host I am on is not configured correctly. I am running graphs using monitorix and also hetrixtools, and it shows a steady low cpu usage. The provider is claiming I am using 10% over what monitorix/hetrix is reporting.

  • Using proxmox, with cpu type host, I'm getting ~3% overhead on gb6 bench.

    Thanked by 1skippy
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