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Date: Thu, 22 Aug 2002 15:30:13 +0100 (BST)
From: Hugh Dickins <hugh@veritas.com>
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To: Nir Soffer <nirs@exanet.com>
cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, James Bourne <jbourne@mtroyal.ab.ca>,
       "Reed, Timothy A" <timothy.a.reed@lmco.com>,
       <linux-kernel@vger.kernel.org>
Subject: RE: Hyperthreading
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On Thu, 22 Aug 2002, Nir Soffer wrote:
> 
> Grepping for MPENTIUM4 in the tree only shows up that it causes the
> kernel to be compiled with -march=i686, much like M686 and  MPENTIUMIII.
> Are there more subtle ways it affects the kernel that I missed? (in the
> 2.4.x tree)

arch/i386/config.in is where the processor characteristics CONFIG_X86_...
are derived from processor type.  There's only one difference between
the CONFIG_MPENTIUMIII configs and the CONFIG_MPENTIUM4 configs (in
2.4.18 or 2.4.19 or 2.4.20-pre4): CONFIG_X86_L1_CACHE_SHIFT 5 or 7.

Alan, that reminds me: 2.4.20-ac sets CONFIG_X86_L1_CACHE_SHIFT 7
when CONFIG_MPENTIUMIII: looks wrong, but perhaps there's a reason?

Hugh

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