Re: git: d9d5f2c042a5 - main - cpuset: add --count

From: Alexey Dokuchaev <danfe_at_freebsd.org>
Date: Fri, 17 Feb 2023 06:26:14 UTC 
On Thu, Feb 16, 2023 at 06:01:32PM +0000, Jessica Clarke wrote:
> On 5 Feb 2023, at 17:28, Alexey Dokuchaev <danfe@freebsd.org> wrote:
> > ...
> > I was wondering whether we need both of these sysctls:
> > 
> > $ sysctl hw.ncpu
> > hw.ncpu: 2
> > $ sysctl kern.smp.cpus
> > kern.smp.cpus: 2
> 
> One prints mp_ncpus, the other smp_cpus. As far as I'm aware those
> two are the same for as long as userspace is running, and only differ
> during early boot before AP bringup (mp_ncpus is how many it will
> bring up, and smp_cpus counts up as they come online until the two
> become equal).

Thank you, makes sense.  I guess it would be nice to have this piece
of knowledge documented somewhere (as these sysctl's own descriptions
are kind of vague) but I can't think of where should it belong.

./danfe