From owner-cvs-all  Tue Nov 23 10:46:38 1999
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From: Matt Dillon <dillon@FreeBSD.org>
Date: Tue, 23 Nov 1999 10:46:10 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/i386/i386 mplock.s
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dillon      1999/11/23 10:46:10 PST

  Modified files:
    sys/i386/i386        mplock.s 
  Log:
      Add in required instruction serialization prior to releasing the
      MP lock for the last time.  The use of a locked instruction to
      cpu-private memory is 3x faster then CPUID and 3x faster then the
      use of a locked instruction to shared memory (the lock itself).
  
      Instruction serialization is required to ensure that any pending
      memory ops are properly flushed prior to the release of the lock,
      due to out-of-order instruction execution by the cpu.
  
  Revision  Changes    Path
  1.28      +21 -2     src/sys/i386/i386/mplock.s



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