netdev - Re: Piggyback the final ACK of the three way TCP connection establishment with the data

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Message-ID: <4F6BB95F.3030200@hp.com>
Date:	Thu, 22 Mar 2012 16:44:31 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Vincent Li <vincent.mc.li@...il.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: Re: Piggyback the final ACK of the three way TCP connection establishment
 with the data

I like piggybacking as much as the next guy, and pushed for a bunch of 
it in the past, but are the files being transferred really that small 
relative to the RTT that the savings of the standalone ACK of the 
SYN|ACK really buys that much?

I'm sure it does nice things for a default netperf TCP_CRR test, shaving 
one segment out of 8 or so, and maybe even more on a TCP_CC test, but 
how many sub-MSS files are transferred these days?

rick jones
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