3. TABULAR REPORTS, GRAPHS, AND MICF INQUIRIES › 3.2 Sample Graphics › 3.2.2 Sample Graphics Descriptions › 3.2.2.7 NCP Buffer Utilization (SNTG203)

3.2.2.7 NCP Buffer Utilization (SNTG203)

INTENDED USAGE:

   This chart helps determine the adequacy and utilization of
   the memory in the communications control unit (CCU).

   After the NCP load module (NCPGEN) is loaded into the CCU,
   the remaining memory is allocated for buffers.  Thus, the
   buffering capability of the CCU is a function of the size
   of the NCPGEN and the amount of installed memory in the
   CCU.  The maximum available NCP buffers value is the
   number of buffers initially allocated.  The average free
   buffer queue length indicates the number of buffers that
   are generally available.  The free buffer low-water mark
   is the lowest number of buffers that were available during
   the interval.  The average free buffer count at slowdown
   is the the number of buffers that were left when the CCU
   became severely memory-constrained.

   Network performance is being impaired if the free buffer
   low-water mark is consistently below the average free
   buffer count at slowdown.  A memory upgrade (if possible)
   should be considered if the average free buffer queue
   length is consistently close to the average free buffer
   count at slowdown.  Otherwise, some of the load on the CCU
   may have to be shifted to another unit.

FORMAT:

   This display produces a line graph showing average free
   buffer queue length in the Network Control Program.

DATA SOURCE (File/Timespan):

   SNTNAF01/DAYS

DATA ELEMENTS USED:

   ZONE, HOUR, NAFAVFBQ, NCPNAME

CALCULATIONS:

   None

USAGE CONSIDERATIONS:

   This inquiry is produced from NetView Performance Monitor
   (NPM) Network data.  Additional buffer statistics are
   provided on the NPM Utilization by NCP report (SNT208),
   described in Section 3.1.3.2.3.