Listen queue overflow: N already in queue awaiting acceptance

[Andriy Gapon]

kernel: sonewconn: pcb 0xfffffe0047db3930: Listen queue overflow: 193 already in
queue awaiting acceptance
last message repeated 113 times
last message repeated 518 times
last message repeated 2413 times
last message repeated 2041 times
last message repeated 1741 times
last message repeated 1543 times
last message repeated 1283 times
last message repeated 1178 times
last message repeated 1020 times
...

What does this messages mean?
Is it really that important to be printed?
Finally, why is it not throttled?

Thank you.
-- 
Andriy Gapon