IO_PRCPU_BITMAP

   (Alpha and Integrity servers) This parameter is a bitmap
   representing up to 1024 CPUs. Each bit set in this bitmap
   indicates that the corresponding CPU is available for use as a
   Fast Path preferred CPU.

   IO_PRCPU_BITMAP defaults to all bits set. (CPU 0 through CPU 1023
   are all enabled for Fast Path port assignment.)

   You might want to disable the primary CPU from serving as a
   preferred CPU by leaving its bit clear in IO_PRCPU_BITMAP, which
   reserves the primary CPU for non-Fast Path IO operations to use.

   To change the value of IO_PRCPU_BITMAP in SYSBOOT or SYSGEN,
   specify a list of individual bits or contiguous groups of bits.
   For example:

      SYSGEN> SET IO_PRCPU_BITMAP 0,5,17-21

   This command sets bits 0, 5, 17, 18, 19, 20, and 21 in the bitmap
   and clears all other bits.

   Changing the value of IO_PRCPU_BITMAP causes the FASTPATH_SERVER
   process to run the automatic assignment algorithm that spreads
   Fast Path ports evenly among the new set of usable CPUs.

   For additional information, see FAST_PATH and FAST_PATH_PORTS.

   This parameter replaces IO_PREFER_CPU.