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From: Alan Cox <alc@FreeBSD.org>
Date: Wed, 2 Mar 2011 00:24:07 +0000 (UTC)
To: cvs-src-old@freebsd.org
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Subject: cvs commit: src/sys/amd64/amd64 pmap.c
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alc         2011-03-02 00:24:07 UTC

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      pmap.c 
  Log:
  SVN rev 219157 on 2011-03-02 00:24:07Z by alc
  
  Make a change to the implementation of the direct map to improve performance
  on processors that support 1 GB pages.  Specifically, if the end of physical
  memory is not aligned to a 1 GB page boundary, then map the residual
  physical memory with multiple 2 MB page mappings rather than a single 1 GB
  page mapping.  When a 1 GB page mapping is used for this residual memory,
  access to the memory is slower than when multiple 2 MB page mappings are
  used.  (I suspect that the reason for this slowdown is that the TLB is
  actually being loaded with 4 KB page mappings for the residual memory.)
  
  X-MFC after:    r214425
  
  Revision  Changes    Path
  1.719     +28 -29    src/sys/amd64/amd64/pmap.c