diff --git a/qm.adoc b/qm.adoc index 12e5921..580d8db 100644 --- a/qm.adoc +++ b/qm.adoc @@ -364,17 +364,21 @@ up to use more CPU time than just its virtual CPUs could use. To ensure that a VM never uses more CPU time than vCPUs assigned, set the *cpulimit* to the same value as the total core count. -The second CPU resource limiting setting, *cpuunits* (nowadays often called CPU -shares or CPU weight), controls how much CPU time a VM gets compared to other -running VMs. It is a relative weight which defaults to `100` (or `1024` if the -host uses legacy cgroup v1). If you increase this for a VM it will be -prioritized by the scheduler in comparison to other VMs with lower weight. For -example, if VM 100 has set the default `100` and VM 200 was changed to `200`, -the latter VM 200 would receive twice the CPU bandwidth than the first VM 100. +*cpuuntis* + +With the *cpuunits* option, nowadays often called CPU shares or CPU weight, you +can control how much CPU time a VM gets compared to other running VMs. It is a +relative weight which defaults to `100` (or `1024` if the host uses legacy +cgroup v1). If you increase this for a VM it will be prioritized by the +scheduler in comparison to other VMs with lower weight. + +For example, if VM 100 has set the default `100` and VM 200 was changed to +`200`, the latter VM 200 would receive twice the CPU bandwidth than the first +VM 100. For more information see `man systemd.resource-control`, here `CPUQuota` -corresponds to `cpulimit` and `CPUWeight` corresponds to our `cpuunits` -setting, visit its Notes section for references and implementation details. +corresponds to `cpulimit` and `CPUWeight` to our `cpuunits` setting. Visit its +Notes section for references and implementation details. The third CPU resource limiting setting, *affinity*, controls what host cores the virtual machine will be permitted to execute on. E.g., if an affinity value