tcp: debugging checks of hashing

[gallatin]

Summary

Not sure if I want to keep this and clean it up, or throw it away

[kbowling]

I think this would be useful for driver developers, but we'd need to document is suitably so people know to look for it.

[tuexen]

I think they are useful.

sys/netinet/tcp_input.c

238

What about using stats counters instead of sysctl variables. netstat could print them.

243

Would it make sense to use bool?

[tuexen]

Why do we have D53088 and D53105?

[gallatin]

sys/netinet/tcp_input.c

238

What about using stats counters instead of sysctl variables. netstat could print them.

Yes, if we're not going to throw this away, then it should use proper stats.

243

Yes, again, having this review show up was a git-arc accident