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Date:      Sun, 22 Mar 2015 09:37:27 -0700
From:      "Sven Brehmer" <sven.brehmer@polycoresoftware.com>
To:        "'Ian Lepore'" <ian@freebsd.org>
Cc:        freebsd-arm@freebsd.org
Subject:   RE: Booting < 4 SMP cores on Wandboard-Quad?
Message-ID:  <009701d064be$7c030180$74090480$@polycoresoftware.com>
In-Reply-To: <1427039443.49126.2.camel@freebsd.org>
References:  <000001d0642f$56f59540$04e0bfc0$@polycoresoftware.com> <1427039443.49126.2.camel@freebsd.org>

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Ian,

Great, thank you!

Regards,
Sven

-----Original Message-----
From: Ian Lepore [mailto:ian@freebsd.org] 
Sent: Sunday, March 22, 2015 08:51
To: Sven Brehmer
Cc: freebsd-arm@freebsd.org
Subject: Re: Booting < 4 SMP cores on Wandboard-Quad?

On Sat, 2015-03-21 at 16:32 -0700, Sven Brehmer wrote:
> Hello,
> 
>  
> 
> We are working with FreeBSD on the Wandboard and we are trying to boot 
> less than 4 cores in SMP mode. We have tried a number of way's with 
> settings in sysctl.conf, loader.conf and  customizing the kernel build 
> with "options MAXCPU=2", but without success.
> 
>  
> 
> Any advice would be appreciated.

Set the hw.ncpu tunable to the number you want.  If you have forth enabled
add to loader.conf:

  hw.ncpu=2

otherwise (no forth) add to loader.rc:

  set hw.ncpu=2

I'm not sure there's good error checking, so don't set it to more cores than
you actually have. :)

-- Ian






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