We’ve been seeing dropped packets on one of our servers — that usually means more data is coming in than can be processed, but it’s nice to confirm rather than guess. The command “netstat -s” displays summary statistics that are nicely grouped into causes:

TcpExt:
16 invalid SYN cookies received
88 resets received for embryonic SYN_RECV sockets
18 packets pruned from receive queue because of socket buffer overrun
2321 ICMP packets dropped because they were out-of-window
838512 TCP sockets finished time wait in fast timer