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qm: resource limits: reword affinity section

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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Thomas Lamprecht 2024-02-20 13:34:47 +01:00
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@ -385,22 +385,22 @@ Notes section for references and implementation details.
*affinity*
With the *affinity* option you can specify the physical CPU cores which are
used to run the VM's vCPUs. Periphal VM processes, such as those for I/O, are
not affected by this setting. Note that the *CPU affinity is not a security
With the *affinity* option, you can specify the physical CPU cores that are used
to run the VM's vCPUs. Peripheral VM processes, such as those for I/O, are not
affected by this setting. Note that the *CPU affinity is not a security
feature*.
Forcing a CPU *affinity* can make sense in certain cases, but is accompanied by
Forcing a CPU *affinity* can make sense in certain cases but is accompanied by
an increase in complexity and maintenance effort. For example, if you want to
add more VMs later or migrate VMs to nodes with fewer CPU cores. It can also
easily lead to asynchronous and therefore limited system performance if some
CPUs are fully utilized while others are almost idle.
The *affinity* is set by calling `taskset`. It accepts the host CPU numbers
(see `lscpu`) in the `List Format` from `man cpuset`. This ASCII decimal list
can contain numbers but also number ranges. E.g., the *affinity* `0-1,8-11` (or
alternatively `0,1,8,9,10,11`) only allow the VM to run on these six host
cores.
The *affinity* is set through the `taskset` CLI tool. It accepts the host CPU
numbers (see `lscpu`) in the `List Format` from `man cpuset`. This ASCII decimal
list can contain numbers but also number ranges. For example, the *affinity*
`0-1,8-11` (expanded `0, 1, 8, 9, 10, 11`) would allow the VM to run on only
these six specific host cores.
CPU Type
^^^^^^^^