_slightly_ tongue-in-cheek, because i'm annoyed by people calling the top 3% "full" stack But, an example is discovering from the DSACK responses that your net

_slightly_ tongue-in-cheek, because i'm annoyed by people calling the top 3% "full" stack But, an example is discovering from the DSACK responses that your network performance sucks because the intel TCP offload firmware is retransmitting entire jumbograms when any packet gets lost. Also discovering that you can't get near full network bandwidth because some moron attaches a 3-byte SNAP header. And if you don't have some idea how your programming language works, how do you know what you're doing? When a memory cache miss costs the equivalent of several hundred instructions.