The meaning of Recv-Q in netstat(8) seems to be a little incorrect.

[lichenxi-cat]

From the man page, it says that:
Recv-Q: Established: The count of bytes not copied by the user program connected to this socket. Listening: Since Kernel 2.6.18 this column contains the current syn backlog.

But according to the source code of current version of Linux kernel, when the state of socket is TCP_LISTEN, the value of rx_queue equals to sk_ack_backlog, which represents the length of accept queue instead of the length of syn backlog. So I think the explanation of Recv-Q from man page is wrong.

[ecki]

Thanks for the info. Did you see if this was wrong all time or has a later kernel version changed it, again? (I am not sure if „syn backlog“ doesn’t mean the same thing, don’t remember)