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Now the question is, how terrible of an idea is it to try playing VR games on my Threadripper in a VM while it's compiling Gentoo packages? I mean, emerge is niced, I have an NVMe drive, and RAM to spare. It *should* work... right? The scheduler *should* handle it, right? Right?
Report: that worked until GCC started compiling. Turns out no, the scheduler cannot handle it. VM was already isolated to one NUMA node, so now I'm sending emerge off to the other one (CPUs only, let's let it use all free RAM).
Yup, that worked fine. A few dropped frames here and there while compiles were pegging one side, but nothing terrible. Beat Saber plays fine.
Are you specifically pinning the vCPUs to particular cores? Or just restricting them to one NUMA node by some other means
The 8 vCPUs are pinned to 8 physical cores on one NUMA node (8 SMT siblings left unused), and the vRAM is pinned to the adjacent memory controller, and the GPU is attached to PCIe lanes on that side. emerge is allowed to use all RAM and the 16 threads on the other NUMA node.
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