My program runs in trouble with a netstat output like bellow. It cannot receive a packet. What does the Recv-Q value in the first line mean? I see the man page, and do some googling, but no result found.
[root@(none) /data]# netstat -ntap | grep 8000
tcp 129 0 0.0.0.0:8000 0.0.0.0:* LISTEN 1526/XXXXX-
tcp 0 0 9.11.6.36:8000 9.11.6.37:48306 SYN_RECV -
tcp 0 0 9.11.6.36:8000 9.11.6.34:44936 SYN_RECV -
tcp 365 0 9.11.6.36:8000 9.11.6.37:58446 CLOSE_WAIT -
tcp 364 0 9.11.6.36:8000 9.11.6.37:55018 CLOSE_WAIT -
tcp 364 0 9.11.6.36:8000 9.11.6.37:42830 CLOSE_WAIT -
tcp 364 0 9.11.6.36:8000 9.11.6.37:56344 CLOSE_WAIT -
tcp 0 364 9.11.6.34:38947 9.11.6.36:8000 FIN_WAIT1 -
tcp 364 0 9.11.6.36:8000 9.11.6.37:52406 CLOSE_WAIT -
tcp 365 0 9.11.6.36:8000 9.11.6.37:53603 CLOSE_WAIT -
tcp 364 0 9.11.6.36:8000 9.11.6.37:47522 CLOSE_WAIT -
tcp 364 0 9.11.6.36:8000 9.11.6.34:48191 CLOSE_WAIT -
tcp 364 0 9.11.6.36:8000 9.11.6.37:51813 CLOSE_WAIT -
tcp 364 0 9.11.6.36:8000 9.11.6.34:57789 CLOSE_WAIT -
tcp 364 0 9.11.6.36:8000 9.11.6.37:34252 CLOSE_WAIT -
tcp 364 0 9.11.6.36:8000 9.11.6.34:38930 CLOSE_WAIT -
tcp 365 0 9.11.6.36:8000 9.11.6.37:44121 CLOSE_WAIT -
tcp 365 0 9.11.6.36:8000 9.11.6.37:60465 CLOSE_WAIT -
tcp 365 0 9.11.6.36:8000 9.11.6.37:37461 CLOSE_WAIT -
tcp 0 362 9.11.6.34:35954 9.11.6.36:8000 FIN_WAIT1 -
tcp 364 0 9.11.6.36:8000 9.11.6.37:55241 CLOSE_WAIT -
P.S. See also at https://groups.google.com/forum/#!topic/comp.os.linux.networking/PoP0YOOIj70
Recv-Q is the Receive Queue. It is the number of bytes that are currently in a receive buffer. Upon reading the socket, the bytes are removed from the buffer and put into application memory. If the Recv-Q number gets too high, packets will be dropped because there is no place to put them.
More info here netstat