Replying back on-list, I don't do support-type mails off-list, and other people know more about sparc64 hardware than me.
On 2020/07/26 22:38, Kihaguru Gathura wrote: > Hi Stuart, > > For legacy, single-core CPU's such as Sparc64 V. > Would OpenBSD cope well with more number of CPU's or less as in previous case? > > Example. > > 2 CPU's (primepower 250) -> 4 CPU's (PrimePower 450) -> 8 CPU's(PrimePower > 650) -> 16 CPU's > (PrimePower 850) -> 32 CPU's (Primepower 1500) It depends on the workload. I'd have thought for most things the max really usable at the moment is probably somewhere in the region of 4-8 cpu cores before kernel locking gets in the way too much. FWIW sparc64 ports builds are now done on T4 and they're really fast. I think (but am not 100% sure) that this is carved into ldoms so the number of cores visible to each OpenBSD instance is limited (so contention between cores in the kernel is also limited).
