From owner-cvs-all  Fri May 28  7: 9: 4 1999
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From: Bruce Evans <bde@FreeBSD.org>
Date: Fri, 28 May 1999 07:09:01 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/i386/isa apic_vector.s clock.c icu_vector.s
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bde         1999/05/28 07:09:01 PDT

  Modified files:
    sys/i386/isa         apic_vector.s clock.c icu_vector.s 
  Log:
  Fixed glitches (jumps) of about 1/HZ seconds for the i8254 timecounter.
  The old version only worked right when the time was read strictly
  more often than every 1/HZ seconds, but we only guarantee reading
  it every (1/HZ + epsilon) seconds.  Part of rev.1.126-1.127 attempted
  to fix this but didn't succeed.  Detect counter rollover using the
  heuristic from the old version of microtime() with additional
  complications for supporting calls from fast interrupt handlers.
  This works provided i8254 interrupts are not delayed by more than
  1/(2*HZ) seconds.
  
  This needs more comments, and cleanups for the SMP case, and more
  testing of the SMP case before it is merged into RELENG_3.
  
  Tested by:		jhay
  
  Revision  Changes    Path
  1.38      +32 -27    src/sys/i386/isa/apic_vector.s
  1.134     +21 -20    src/sys/i386/isa/clock.c
  1.12      +20 -18    src/sys/i386/isa/icu_vector.s



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