Ryzen issues on FreeBSD ? (with sort of workaround)

[Pete French]

On 03/06/2018 18:49, Mike Tancsa wrote:

> I have c-states disabled on the ryzen both for FreeBSD and Linux.  To
> disable SMP on the Epyc doesnt seem to be possible. But then again kill
> off 31 cores is a heavy cost to pay for stability :(  When I am back at
> the office, I will see if a recent checkout of HEAD still freezes the Epyc.

Agreed about the performance hit turning off SMP! Am hoping its a 
temporary thing, and if we can show it *is* SMP then maybe that will 
hepl with a fix, as there cant be that many places where SMP is handled 
differently to real cores I would think. If you could test then that 
would be great!

cheers,

-pete.