smzgl

yes, you are right, default priority is half of the available priorities. in my case, server have 600k+ outgoing connection, they are use domain names to connect to different host....

all connection work in one process, but not one thread. and the connections not always send request. so server it works well so far, except dns query. it is usefull...

actually, in my environment: > cat /proc/sys/net/ipv4/udp_mem > 2955 3942 5910 if dns query above 200~800 per second, less then 10 dns queries would timeout. sometimes 500 or so new...