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Date: Sun, 13 Nov 2011 17:02:02 -0700
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From: Jason Wolfe <nitroboost@gmail.com>
To: Erich Weiler <weiler@soe.ucsc.edu>
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Cc: freebsd-net@freebsd.org, grenville armitage <garmitage@swin.edu.au>
Subject: Re: Arg. TCP slow start killing me.
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On Sun, Nov 13, 2011 at 4:53 PM, Erich Weiler <weiler@soe.ucsc.edu> wrote:

> I suspect my firewall *is* the cause of the packet loss, unfortunately.
>> We're sending multiple streams in from multiple sources and
>> destinations, but the aggregate bandwidth coming into the firewall is
>> consistent no matter how many sources and destinations we have. It maxes
>> at about 2Gb/s. That's why I was trying to tweak the firewall, to try
>> and get that number up.
>>
>
> Sorry, to be clear, the *average* bandwidth was like 2Gb/s, I'm really
> trying to dodge the sawtooth traffic pattern in some way, I see it go up to
> 3Gb/s every once in a while.  I was hoping to achieve getting closer to
> 3Gb/s on average by adding buffers to my firewall, but maybe that isn't the
> answer...
>
> I tried Jason's suggestions earlier but it didn't seem to help much
> unfortunately.


Yeah, skimming fail, I didn't realize the machine was not the termination
point of your connections.  I do have patches back ported that would likely
get the modular congestion control working on 8.1,  but neither my
suggestions nor the implementation of Cubic will help much as mentioned.

Jason