Re: CPU pinning implementation through libvirt

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On Wed, Aug 16, 2023 at 05:41:37PM -0600, xtec@xxxxxxxxxxxxxx wrote:
I'll be direct.

After learning that QEMU itself has never officially implemented options
such as "-vcpu", "-vcpupin", or similar, remaining only as unimplemented
commits at their mailing lists, I felt the need of asking here once and
for all:

How does libvirt actually implements CPU pinning under the hood?
There's the xml with the cputune section and all the vcpupins, but does
libvirt translates this to QEMU native commands, or what else does it
do?


It uses whatever the underlying OS provides, cgroups, setting affinity,
etc. on QEMU's threads.

Thanks.

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