Date: Tue, 09 Feb 1999 17:02:45 +0100 From: HERBELOT Thierry <Thierry.Herbelot@alcatel.fr> To: smp@FreeBSD.ORG Subject: Mixing P2 Types Message-ID: <36C05C25.21A58851@telspace.alcatel.fr>
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(re-post from -questions : this is the right place)
Hello,
I'm contemplating buying an SMP motherboard, now that SMP is a
"mainstream" feature of FreeBSD-Stable.
I was wondering if it is possible to mix P2-types on an SMP motherborad
(I've got already a p2-266, and I would like to buy just an SMP
motherboard (perhaps an ASUS P2L-DS) and the cheapest p2 I can buy
today, which must be a p2-333)
I remember that you had to be very strict when running SMP-Pentiums
(same mask level, same speed ....) Is it still the case for P2 ?
TIA
TfH
PS : after some research :
In the SMP spec v1.4 :
B.8 Supporting Unequal Processors:
Some MP operating systems that exist today do not support processors of
different types, speeds, or capabilities. However, as processor
lifetimes increase and new generations of processors arrive, the
potential for dissimilarity among processors increases. The MP
specification addresses this potential by providing an MP configuration
table to help the operating system configure itself. Operating system
writers should factor in processor variations, such as processor type,
family, model, and features, to arrive at a configuration that maximizes
overall system performance. At a minimum, the MP operating system should
remain operational and should support the common features of unequal
processors.
BUT the spec for an ASUS P2L97DS shows that there is only on jumper set
to define the bus and core clock of both CPUs (chapter III Installation
/ page 15)
So : the OS may allow some difference in the processor type, but the
motherboard does not.
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