linux-kernel - Re: Choosing a HyperThreading/SMP/MultiCore kernel ?

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Message-ID:  <45A93E97.30007@tmr.com>
Date:	Sat, 13 Jan 2007 15:18:31 -0500
From:	Bill Davidsen <davidsen@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Sunil Naidu <akula2.shark@...il.com>, linux-kernel@...r.kernel.org
Subject:  Re: Choosing a HyperThreading/SMP/MultiCore kernel ?

Valdis.Kletnieks@...edu wrote:
> On Fri, 12 Jan 2007 10:03:49 EST, Lennart Sorensen said:
>> I would expect any distribution should work on these (as long as the
>> kernel they use isn't too old.).  Of course if it is a Mac, you need a
>> distribution that supports their firmware (which is of course not a PC
>> bios).  As long as you can boot it, any i386 or amd64 kernel with smp
>> enabled should use all the processors present (well amd64 on the
>> core2duo and on the p4 if it is em64t enabled).
> 
> amd64 will only work on a core2duo if it's a T7200 or higher - the
> lower numbers are 32-bit-only chipsets.  I admit not knowing what
> exact variant the Mac has.

I don't believe that's correct, the Intel features page indicates all 
core2 have both 64bit and virtualization. Perhaps some of the core (no 
2) models didn't? Even the old 930 had those features by my notes.
> 
>> I believe the closest optimization for a Core2 is probably the Pentium M
>> (certainly not the P4/netburst).  Not entirely sure though.
> 
> CONFIG_MCORE2=y
> 
> That's probably even closer :)  At least in 2.6.20-rc4-mm1.  

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