Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 434
CommsMemFree3
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Section 10. Troubleshooting CommsMemFree(2) number will be. A PakBusNodes setting of 50 is normally enough, and can probably be reduced in small networks to free memory, if needed. Reducing PakBusNodes by one frees 224 bytes. If CommsMemFree(2) drops and stays down for no apparent reason (a very rare occurrence), please contact a Campbell Scientific applications engineer since the CR1000 operating system may need adjustment. 10.4.3.3 CommsMemFree(3) CommsMemFree(3) Specifies three two-digit fields, from right (least significant) to left (most significant): • lilfreeq = "little" IP packets available • bigfreeq = "big" IP packets available • rcvdq = IP packets in the received queue (not yet processed) At start up, with no TCP/IP communication occurring, this field will read 1530, which is interpreted as 30 lilfreeq and 15 bigfreeq available, with no packets in rcvdq. The Ethernet and/or the PPP interface feed rcvdq. If CommsMemFree(3) has a reading of 21428, then two packets are in the received queue, 14 bigfreeq packets are free (one in use), and 28 lilfreeq are free (two in use). These three pieces of information are also reported in the IP trace (p. 457) information every 30 seconds as lilfreeq, bigfreeq, and recvdq. If lilfreeq or bigfreeq free packets drop and stay near zero, or if the number in rcvdq climbs and stays high (all are rare occurrences), please contact a Campbell Scientific application engineer as the operating system may need adjustment. CommsMemFree(3) is encoded as follows: CommsMemFree(3) = lilfreeq + bigfreeq*100 + rcvdq*10000 + sendq*1000000 where, lilfreeq = number of small TCP packets available bigfreeq = number of large TCP packets rcvdq = number of input packets currently waiting to be serviced sendq = number of output packets waiting to be sent The following expressions can be used to pick the values out of the CommsMemFree(3) variable: lilfreeq = CommsMemFree(3) % 100 bigfreeq = (CommsMemFree(3) / 100) % 100 rcvdq = (CommsMemFree(3) / 10000) % 100 sendq = (CommsmemFree(3) / 1000000) % 100 434