From owner-cvs-all  Mon May 10 18:54:56 1999
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From: Alan Cox <alc@FreeBSD.org>
Date: Mon, 10 May 1999 18:54:53 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/i386/i386 perfmon.c
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alc         1999/05/10 18:54:53 PDT

  Modified files:
    sys/i386/i386        perfmon.c 
  Log:
  The Intel Pentium Pro's performance counters are 40 bits wide.  The Intel
  manuals specifically say that reading the counters using the rdmsr
  instruction returns a 64 bit value of which the higher 24 bits are
  undefined. The code that reads the counters should then clear the
  high 24 bits.
  
  PR:		 i386/10632
  
  Revision  Changes    Path
  1.18      +3 -3      src/sys/i386/i386/perfmon.c


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