Re: SMP/UP kernel S01E02

["Thomas E. Spanjaard" <tgen@xxxxxxxxxxxxx>]

Dmitri Nikulin wrote:
> On 3/24/07, Gergo Szakal <bastyaelvtars@gmail.com> wrote:
> > Well, I've been thinking of the SMP/UP issue many times, and the best 
> > solution would be if SMP kernels could boot on UP machines. I have 
> > plenty UP boxes and a few SMP boxes to test on. I am not claiming 
> > anyhing, this is just 'food for thought'.
> Don't they? I thought the only problem for most cases is that the SMP
> kernels do more heavyweight locking and are therefore slower, and
> without the gain of parallelism on UP it's a pure loss.

DragonFly SMP expects multiple processors, and will die if it doesn't 
find any, iirc when it tries to detect other APICs. As an example of 
working SMP-kernel-on-UP-hardware, see NetBSD (which doesn't involve 
boottime binary patching, btw).

Cheers,
--
        Thomas E. Spanjaard
        tgen@netphreax.net

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