Date: Fri, 17 Feb 2023 06:26:14 +0000 From: Alexey Dokuchaev <danfe@freebsd.org> To: Jessica Clarke <jrtc27@freebsd.org> Cc: Mateusz Guzik <mjguzik@gmail.com>, src-committers <src-committers@freebsd.org>, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: d9d5f2c042a5 - main - cpuset: add --count Message-ID: <Y%2B8eBqO7PuLcsaKI@FreeBSD.org> In-Reply-To: <A5FA934E-1DAA-45A9-9900-3E8A91BEF4FC@freebsd.org> References: <202302041751.314HpRrn042970@gitrepo.freebsd.org> <Y98dOenW9mulqNzm@FreeBSD.org> <CAGudoHGn1-zZTAX4r1h_xMpaA4zd9b2y4_N21Jah1pdGsqsuQA@mail.gmail.com> <Y9/nUguGt6mlksGF@FreeBSD.org> <A5FA934E-1DAA-45A9-9900-3E8A91BEF4FC@freebsd.org>
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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
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