FreeBSD Foundation and iXsystems Collaborate to Further the Cause of High Performance Computing on FreeBSD

[John Marino]

On 2/9/2014 21:17, Justin Sherrill wrote:
> You are the second person to mention this that I've heard in the last
> few days.  I remember that there was some arbitrary limit on processor
> count in DragonFly - 63, I think.  I don't know how much of an obstacle
> that actually is.  
> 

It's not arbitrary.
It's 2^6-1 -- IIUC there are only 6 bits available on some key location
although I am missing some information to explain why the limit isn't 64.

Anyway, apparently it will take some significant rework to increase the
max CPU count, but I'll leave that for Matt to explain.

John