Re: [Codel] Worst case conditions - large RTT

[Dave Taht <dave.taht@gmail.com>]

On Wed, May 9, 2012 at 1:36 PM, Simon Barber <simon@superduper.net> wrote:
> Codel assesses the minimum delay over a fixed time period (the interval) -
> what happens when the interval is much smaller that the RTT. For example a
> tcp stream is experiencing a 2 second RTT (perhaps due to bufferbloat at
> some point), yet the interval is 100ms. The TCP implementation is a poor one
> that will ACK a window at a time. Here codel will drop excessively, and
> cause low throughput?
>

You are doing a great job of asking good questions.

I would hope we could get some more people lined up to answer them,
armed with sims and real hardware. Volunteers for each problem would
be helpful.

Me, I'd like very much to get some data back on the variable bandwidth
wireless scenario! Except that cerowrt's too broken at the moment to
use and I'm trying to fix that.

The latest netem does ECN, btw. And ns3 has a decent minstrel model.
(hint, hint)

> Simon
> _______________________________________________
> Codel mailing list
> Codel@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/codel



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Dave Täht
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