Error "Address in use" when doing pool

Some update:

 

If I increase the volume gradually from my simulator, for example, 5 TPS for 2 seconds, 10 TPS for 2 seconds, 30 TPS for 5 seconds, then 90 TPS, I can process the message up to 100 TPS.

 

 

Is this related to configuration in TCP and MBLB profile?