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From: Alexander Motin <mav@FreeBSD.org>
Date: Tue, 23 Jun 2009 21:45:33 +0000 (UTC)
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Subject: cvs commit: src/sys/amd64/isa clock.c src/sys/i386/isa clock.c
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mav         2009-06-23 21:45:33 UTC

  FreeBSD src repository

  Modified files:
    sys/amd64/isa        clock.c 
    sys/i386/isa         clock.c 
  Log:
  SVN rev 194772 on 2009-06-23 21:45:33Z by mav
  
  Rework r193814:
  While general idea of patch was good, it was not working properly due the way
  it was implemented. When we are using same timer interrupt for several of
  hard/prof/stat purposes we should not send several IPIs same time to other
  CPUs. Sending several IPIs same time leads to terrible accounting/profiling
  results due to strong synchronization effect, when the second interrupt
  handler accounts processing of the first one.
  Interlink timer events in a such way, that no more then one IPI is sent for
  any original timer interrupt.
  
  Revision  Changes    Path
  1.249     +31 -34    src/sys/amd64/isa/clock.c
  1.253     +32 -36    src/sys/i386/isa/clock.c