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pct/qm: update cpuunits default

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which is 100 on hosts running cgroup v2. Still mention the old default
relevant for hosts with legacy cgroups.

Also reword the sentence with "gets in regards to other VMs running"
which sounded a bit off.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
This commit is contained in:
Fiona Ebner 2022-10-07 14:41:39 +02:00 committed by Thomas Lamprecht
parent b90b797f86
commit 48219c581f
2 changed files with 9 additions and 8 deletions
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5
pct.adoc
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@ -427,8 +427,9 @@ cpulimit: 0.5
`cpuunits`: :: This is a relative weight passed to the kernel scheduler. The
larger the number is, the more CPU time this container gets. Number is relative
to the weights of all the other running containers. The default is 1024. You
can use this setting to prioritize some containers.
to the weights of all the other running containers. The default is `100` (or
`1024` if the host uses legacy cgroup v1). You can use this setting to
prioritize some containers.
[[pct_memory]]

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qm.adoc
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@ -317,12 +317,12 @@ never uses more CPU time than virtual CPUs assigned set the *cpulimit* setting
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 in regards to other
VMs running. It is a relative weight which defaults to `1024`, if you increase
this for a VM it will be prioritized by the scheduler in comparison to other
VMs with lower weight. E.g., if VM 100 has set the default 1024 and VM 200 was
changed to `2048`, the latter VM 200 would receive twice the CPU bandwidth than
the first VM 100.
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. E.g.,
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`