Benchmarks: AMD64 vs i386 on Dual 246 Opteron
obrien at freebsd.org
Tue Aug 2 17:49:37 GMT 2005
On Fri, Jul 29, 2005 at 02:06:09AM -0700, ray at redshift.com wrote:
> In going over my notes, the only thing I
> can see that might have been a mistake was if I left out 'options SMP'
> from the AMD64 kernel config file. But I seem to recall you do not
> have to include that on AMD64 like you do with i386 - can anyone
> confirm this?
Totally false! A kernel w/o 'options SMP' is a UP kernel and only uses a
single CPU. I suspect is what you are mis-remembering is that an AMD64
SMP kernel will boot and work just fine on a UP AMD64 machine. (which
hasn't been the case on i386 in the past)
-- David (obrien at FreeBSD.org)
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