Neat: but isn't this a type-1 hypervisor?

Posted Sep 21, 2025 10:15 UTC (Sun) by willy (subscriber, #9762)
In reply to: Neat: but isn't this a type-1 hypervisor? by ballombe
Parent article: Multiple kernels on a single system

Well, there's two schools of thought on that. Some say that NUMA hops are so slow and potentially congested (and therefore have high variability in their latency) that it's worth replicating read-only parts of the working set across nodes. They even have numbers that prove their point. I haven't dug into it enough to know if I believe that these numbers are typical or if they've chosen a particularly skewed example.

Neat: but isn't this a type-1 hypervisor?

Posted Sep 21, 2025 12:42 UTC (Sun) by ballombe (subscriber, #9523) [Link] (3 responses)

This is correct. However, NUMA systems come with libraries to give you access to the physical layout so you can copy the working set only once per coherent NUMA blocks, which are much larger than 16 cores nowadays.