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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* *affinity*
With the *affinity* option you can specify the physical CPU cores which are With the *affinity* option, you can specify the physical CPU cores that are used
used to run the VM's vCPUs. Periphal VM processes, such as those for I/O, are to run the VM's vCPUs. Peripheral VM processes, such as those for I/O, are not
not affected by this setting. Note that the *CPU affinity is not a security affected by this setting. Note that the *CPU affinity is not a security
feature*. 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 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 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 easily lead to asynchronous and therefore limited system performance if some
CPUs are fully utilized while others are almost idle. CPUs are fully utilized while others are almost idle.
The *affinity* is set by calling `taskset`. It accepts the host CPU numbers The *affinity* is set through the `taskset` CLI tool. It accepts the host CPU
(see `lscpu`) in the `List Format` from `man cpuset`. This ASCII decimal list numbers (see `lscpu`) in the `List Format` from `man cpuset`. This ASCII decimal
can contain numbers but also number ranges. E.g., the *affinity* `0-1,8-11` (or list can contain numbers but also number ranges. For example, the *affinity*
alternatively `0,1,8,9,10,11`) only allow the VM to run on these six host `0-1,8-11` (expanded `0, 1, 8, 9, 10, 11`) would allow the VM to run on only
cores. these six specific host cores.
CPU Type CPU Type
^^^^^^^^ ^^^^^^^^