Symptoms
Aggressive sweeper messages are seen in /var/log/ltm similar to the following:
Dec 31 02:35:44 bigip1 warning tmm[25306]: 011e0002:4: sweeper_segment_cb_any: Aggressive mode /Common/default-eviction-policy activated (0) (global memory). (26227799/30854144 pages)
In severe cases, tmm might restart and generate a core file due to an out of memory condition.
Impact
A portion of the connections handled by the BIG-IP might be dropped causing traffic interruption for those connections.
In severe cases, tmm might restart causing traffic interruption.
Conditions
The active BIG-IP has a large number of mirrored fastL4 connections.
The active BIG-IP reconnects the statemirror connection to the standby BIG-IP.
This is indicated by messages similar to the following in /var/log/ltm:
Dec 31 02:35:37 bigip1 err tmm[25306]: 01340001:3: high availability (HA) Connection with peer 10.25.0.11:1029 for traffic-group /Common/traffic-group-1 established.
Fix Information
The memory utilization when remirroring fastL4 flows has been improved to allow remirroring to handle a larger number of connections.
