Date: Tue, 20 Jan 2009 04:27:05 -0800 (PST) From: Barney Cordoba <barney_cordoba@yahoo.com> To: Christoph Mallon <christoph.mallon@gmx.de> Cc: freebsd-current@freebsd.org Subject: Re: Running on only some cores Message-ID: <10041.11443.qm@web63907.mail.re1.yahoo.com> In-Reply-To: <4975B49A.5060205@gmx.de>
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--- On Tue, 1/20/09, Christoph Mallon <christoph.mallon@gmx.de> wrote:
> From: Christoph Mallon <christoph.mallon@gmx.de>
> Subject: Re: Running on only some cores
> To: barney_cordoba@yahoo.com
> Cc: freebsd-current@freebsd.org
> Date: Tuesday, January 20, 2009, 6:25 AM
> Barney Cordoba schrieb:
> > Can FreeBSD be configured to only run on N cores? So
> for example, if I have an 8 core system, can it be
> configured in loader.conf or through a simple hack to only
> run on 2 cores?
> >
> > We're testing various configs, and its not
> terribly convenient to keep swapping out CPUs.
>
> man 4 smp
> look for machdep.hlt_cpus
Ok, I see this does something when run after boot. So there is no way to get the OS to simply not launch the CPU? We have something that reads the number of cpus, which doesn't seem to change.
Barney
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