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[doc] install_libvirt: Finishing touches

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Jonathan Rubenstein
2026-10-26 18:41:11 +02:00
committed by Geoffrey McRae
parent b694c79d9d
commit 1ecc4884ac
1 changed files with 5 additions and 8 deletions
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doc/install_libvirt.rst
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@@ -164,16 +164,13 @@ required to obtain optimal performance.
3. If you are on a NUMA architecture (dual CPU, or early Threadripper) be sure
that you pin the vCPU threads to the physical CPU/die attached to your GPU.
4. Just because your GPU is in a slot that is physically x16 in size, does not
mean your GPU is running at x16, this is dependent on how your motherboard
is physically wired and the physical slot may be limited to x4 or x8.
4. Get familiar with your specific motherboard's PCIe slots. Larger physical
slots (for example x16) may only operate at a slower speed (like x8),
depending on your motherboard's layout.
5. Be sure to set your CPU model type to `host-passthrough` so that your guest
operating system is aware of the acceleration features of your CPU and can
make full use of them.
6. AMD users be sure that you have the CPU feature flag `topoext` enabled or
your guest operating system will not be aware of which CPU cores are
hyper-thread pairs.
How to perform these changes is left as an exercise to the reader.
6. For users of AMD CPUS, enable the `topoext` feature flag to inform the guest
operating system of your CPU's hyper-threading core pairs.