NCP Buffer Utilization (SNTG203)
NCP Buffer Utilization (SNTG203) chart helps determine the adequacy and utilization of the memory in the communications control unit (CCU).
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NCP Buffer Utilization (SNTG203) 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 the NPM/NetSpy Utilization by NCP (SNT208) section.