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From: Jung-uk Kim <jkim@FreeBSD.org>
Date: Wed, 8 Jun 2011 19:38:31 +0000 (UTC)
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Subject: cvs commit: src/sys/x86/x86 tsc.c
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jkim        2011-06-08 19:38:31 UTC

  FreeBSD src repository

  Modified files:
    sys/x86/x86          tsc.c 
  Log:
  SVN rev 222866 on 2011-06-08 19:38:31Z by jkim
  
  Introduce low-resolution TSC timecounter "TSC-low".  It replaces the normal
  TSC timecounter if TSC frequency is higher than ~4.29 MHz (or 2^32-1 Hz) or
  multiple CPUs are present.  The "TSC-low" frequency is always lower than a
  preset maximum value and derived from TSC frequency (by being halved until
  it becomes lower than the maximum).  Note the maximum value for SMP case is
  significantly lower than UP case because we want to reduce (rare but known)
  "temporal anomalies" caused by non-serialized RDTSC instruction.  Normally,
  it is still higher than "ACPI-fast" timecounter frequency (which was default
  timecounter hardware for long time until r222222) to be useful.
  
  Revision  Changes    Path
  1.21      +38 -6     src/sys/x86/x86/tsc.c