On 27/11/2018 23:06, Rodney W. Grimes wrote:
I was reading the bhyve man page and noticed that it said the maximum
number of virtual CPUs is limited to 16. With AMD Epyc being out with 32
cores and 64 threads per CPU and being able to have 2 of them in one
system this number seems rather low by modern standards.
So you can run 4 x 16 vcpu VM's, probably more common than
someone trying to run 1 VM of 32 or 64 vcpu.
Are there any plans to increase this number to something like 32 virtual
CPUs?
There is work in process to change this from a compile time
kernel constant to a per VM value set using the undocumnted,
but present value in the cpu_topology option max_cpu.
We do not want to just crank this value up as data structures
for each VM are sized on the MAXCPU connstant, and doubling
that to 32 would be fairly wasteful for low core count VM's.
Thank you for the reply.
Ah, that makes sense. Nice to know that it is something that is being
worked on.
The only reason I really want to go above 16 vCPUs is that some other
providers offer VPS instances with more vCPUs than that. I could quite
happily live with 16 myself.
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