Re: [rfc] generic allocator and mspec driver

From: David Mosberger <davidm_at_napali.hpl.hp.com>
Date: 2005-02-16 05:04:49
>>>>> On 15 Feb 2005 03:43:10 -0500, Jes Sorensen <jes@wildopensource.com> said:

>>>>> "Tony" == Luck, Tony <tony.luck@intel.com> writes:

  Tony> Is ia64 the only architecture that has uncached vs. cached
  Tony> access issues?  If so, the PG_arch_1 might have to be the
  Tony> solution, but surely others have cache coherence problems too
  Tony> if there are mixed cacheable and uncacheable access to the
  Tony> same memory?  In which case a new generic bit would be more
  Tony> appropriate.

  Jes> None of the ones I know well have this problem, but I have
  Jes> little knowledge about this level of stuff on most
  Jes> architectures. The ones that could have issues would probably
  Jes> be like PPC, PARISC and maybe Alpha .....

Well, any CPU that allows overlapping mappings and does _any_ sort of
speculative accesses will have a problem.  The only question is
whether you'll get an explicit error notification (e.g., MCA) or
silent data corruption.

	--david
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Received on Tue Feb 15 13:05:03 2005

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