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Date: Sun, 13 Nov 2011 22:54:44 -0800
From: Erich Weiler <weiler@soe.ucsc.edu>
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Cc: freebsd-net@freebsd.org
Subject: Re: Arg. TCP slow start killing me.
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> Have you considered empty ACK prioritization? I implemented this a year
> ago on a pair of production edge routers and noticed significant
> improvement on throughput. I have production code examples if you
> require them, but this link should be more than enough to get you started:

Fascinating.  pfSense does have traffic shaping options, among them ACK 
prioritization and queues.  Let me play with that a bit.  Totally could 
be affecting me - my downstream traffic could be great enough to crows 
out ACKs, thus causing the TCP stream resets.  Sounds plausible, at least.