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Message-Id: <200208300029.g7U0TrrW006459@freefall.freebsd.org>
From: Peter Wemm <peter@FreeBSD.org>
Date: Thu, 29 Aug 2002 17:29:53 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/sys param.h
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peter       2002/08/29 17:29:53 PDT

  Modified files:
    sys/sys              param.h 
  Log:
  AARGH!  btoc() is used in the MI buffer sizing routines to calculate
  the minimum of either physmem or KVA.  But.. btoc() casts the address
  to (unsigned int).  This is NOT GOOD on 64 bit machines and on alpha and
  ia64, this results in a buffer limit of around 500K (not megs).  This
  causes extreme disk access problems on alpha and ia64.  Since this cast
  is simply to ensure that it is unsigned, use 'vm_offset_t' instead.  This
  is available because it is already defined in types.h.
  
  Alpha has been suffering from this for ages. It always felt like the
  caching wasn't working, and unfortunately it turned out that way. :-(
  
  Revision  Changes    Path
  1.133     +1 -1      src/sys/sys/param.h

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