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From: David Miller <davem@davemloft.net>
Subject: Re: TCP packet size and delivery packet decisions
Date: Tue, 07 Sep 2010 09:35:48 -0700 (PDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Tue, 07 Sep 2010 13:39:12 +0200

> I am not sure why TSO added a "Bound mss with half of window"
> requirement for tcp_sync_mss()

Because if we TSO to the full window the link doesn't fill up
properly.

We definitely do this on purpose, that's for sure.  :-)

I'll look into the full version control history to unearth the
exact reason so we can validate your patch, good find Eric.