kern.kq_calloutmax - when to increase

[Eugene M. Zheganin]

Hello,

so imagine I have a web balancer using nginx with kqueue which handles 
numerous connections to a set of kqueue-enabled custom 
applications/backends, so my question is - should I ever touch the 
default kern.kq_calloutmax of 4K or should I left it there ? And if it 
should be tuned - where is the TCP connection treshold ?

Thanks.