Do the Nagle Algorith and Delayed ACK's affect TCP Connection Setup?

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136

answers:

+1 Q:

Do the Nagle Algorith and Delayed ACK's affect TCP Connection Setup?

Do the client's SYN and the servers SYN+ACK get delayed by Nagle? Will the client's ACK of the server's SYN get delayed?

Will connect return after rtt+spt or will it take rtt + spt + 2x Nagle Delay?

Or more generally, how do the Nagle Algorith and Delayed ACK's affect TCP Connection Setup?

+4 A:

No, NAGLE does not effect SYN or SYN+ACK. Neither does delayed ACK (logically enough, you want the SYN+ACK to come back as quick as possible, and there is no congestion state to cause a holdoff yet anyway).

Andrew McGregor 2010-03-09 11:45:10

@Andrew: What you're saying makes sense. Do you have any references to standards or anything like that?

Robert S. Barnes 2010-03-16 07:32:34

RFC 2581 section 4.2 is the basic reference, but I'd read a stack implementation to really see the details of this; FreeBSD is pretty easy to read, the Linux stack drowns the algorithm in abstractions.

Andrew McGregor 2010-03-16 22:16:45