Arg. TCP slow start killing me.

Ermal Luçi eri at
Mon Nov 14 09:14:38 UTC 2011

On Mon, Nov 14, 2011 at 7:54 AM, Erich Weiler <weiler at> wrote:
>> 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.

pfSense has dummynet and ACK prioritization that can help here though
i think before implementing
a fix you should find the cause to fix!


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