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From: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Wed, 5 Feb 2003 01:20:40 -0800 (PST)
To: all-committers@FreeBSD.org, legacy-committers@FreeBSD.org,
	cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/i386/include clock.h src/sys/i386/i386 tsc.c
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phk         2003/02/05 01:20:40 PST

  Modified files:
    sys/i386/include     clock.h 
    sys/i386/i386        tsc.c 
  Log:
  i386/i386/tsc.c was repo-copied from i386/isa/clock.c.
  
  Remove all the stuff that does not relate to the TSC.
  
  Change the calibration to use DELAY(1000000) rather than trying to check
  it against the CMOS RTC, this drastically increases precision:
  
  Using 25 samples on a Athlon 700MHz UP machine I find:
  
                  stddev          min          max        average
  CMOS             22200 Hz    -74980 Hz     34301 Hz   704928721 Hz
  DELAY             1805 Hz     -1984 Hz      2678 Hz   704937583 Hz
  
  (The difference between the two averages is not statistically significant.)
  
  expressed in PPM of the frequency:
                  stddev          min          max
  CMOS             31.49 PPM  -106.37 PPM    48.66 PPM
  DELAY             2.56 PPM     2.81 PPM     3.80 PPM
  
  This code will not be used until a followup commit to sys/isa/clock.c
  and sys/pc98/pc98/clock.c which will only happen after some field testing.
  
  Revision  Changes    Path
  1.195     +19 -1188  src/sys/i386/i386/tsc.c
  1.44      +1 -0      src/sys/i386/include/clock.h

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