Subject: Re: Any known probs with MP i386 and > 1GB mem?
To: Jaromir Dolecek <>
From: Gary Thorpe <>
List: current-users
Date: 10/11/2002 10:34:29
Shouldn't the most important factor be the bus speed, since all newer
x86 cpus have an internal clock which differs from the bus clock? Since
SMP does communication at bus clock speeds, why should differences in
the internal clock speed matter? Although different varieties may not
interoperate properly, why should running using a 800Mhz PIII and a
700Mhz PIII be problematic if both use identical bus specifications
(these two in particular may not have identical bus specifications, but
the question is regarding the case that two cpus have diffeent internal
speeds but have the same bus specifications)?

If it really won't work, anyone know why not?

--- Jaromir Dolecek <> wrote:
> It's not good to run different CPUs on same system. IIRC even Intel
> says MP is not supported when CPUs have different brand (i.e. you
> can't mix PII and PIII); same may apply for speed. Any chance to try
> with two identical CPUs to rule this out?
> Jaromir
> Murray Armfield wrote:
> > Hi,
> > 	Does anyone know if there are any issues with using more than one
> GB of 
> > memory on an i386 MP system running current (yesterday)? Runs fine
> with 1GB. 
> > If I add 512MB things are very bad.
> > 
> > 	Also, I have two processors running at different speeds. The
> slower one is in 
> > the primary cpu slot (from when I was using it uniproc), and the
> faster one 
> > is in the secondary slot. NetBSD boots up and has swapped the cpu
> numbering 
> > and seems to be running off the secondary CPU. Is this OK? Seems
> fine in use.
> > 
> > Regards,
> > 	Murray Armfield
> > 
> -- 
> Jaromir Dolecek <>           
> -=- We should be mindful of the potential goal, but as the tantric   
> -=-
> -=- Buddhist masters say, ``You may notice during meditation that you
> -=-
> -=- sometimes levitate or glow.   Do not let this distract you.''    

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