cvs commit: src/sys/amd64/amd64 mp_machdep.c src/sys/i386/i386 mp_machdep.c

John Baldwin jhb at
Thu Mar 9 16:38:53 UTC 2006

jhb         2006-03-09 16:38:52 UTC

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      mp_machdep.c 
    sys/i386/i386        mp_machdep.c 
  Flip the switch and don't route interrupts to hyperthreads in a HT system.
  In at least one benchmark this showed around a 20% performance increase.
  If other workloads do benefit from having hyperthreads service interrupts,
  we can always make this a loader tunable.
  MFC after:      3 days
  Tested by:      ps
  Revision  Changes    Path
  1.270     +2 -2      src/sys/amd64/amd64/mp_machdep.c
  1.264     +2 -2      src/sys/i386/i386/mp_machdep.c

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