Re: [Bloat] some 110Mbit cable testing of the new dslreports stuff

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

monitoring queue depth at the minimum interval (100ms) I can do
without writing special tools, I do not see delays greater than 60ms
at the inbound qdisc, nor excessive numbers of packets outstanding.

watch -n .1 tc -s qdisc show dev ifb4eth2

Yet this is reporting inbound delays in excess of 4 sec, and pauses:

http://www.dslreports.com/speedtest/378332


On Mon, Apr 27, 2015 at 2:28 PM, Dave Taht <dave.taht@gmail.com> wrote:
> For reference, this is the comcast link under test, with no shaping at all:
>
> http://www.dslreports.com/speedtest/377563
>
> (horrific, isn't it?)
>
> I did a few fq_codel + ecn tests
>
> http://www.dslreports.com/speedtest/377389
> http://www.dslreports.com/speedtest/377429
>
> And cake: http://www.dslreports.com/speedtest/377505
>
> No ecn fq_codel: http://www.dslreports.com/speedtest/377443
>
> no ecn with pie: http://www.dslreports.com/speedtest/377488
>
> no ecn with ns2_codel: http://www.dslreports.com/speedtest/377563
>
> no ecn with codel: http://www.dslreports.com/speedtest/377703
>
> It is difficult to conclude anything from the download tests without
> going through the captures, although the uplink tests look reasonable
> compared to the rrul tests. If it wasn't for the pie result, I would
> assume it was the browser misbehaving on downloads, or the server. The
> tcp_download tests taken with the same setup with netperf-wrapper show
> what I had assumed til now a normal variance of latency.
>
> http://snapon.lab.bufferbloat.net/~d/yurtlab100.tgz is that set of results
>
> http://snapon.lab.bufferbloat.net/~d/yurtlab100/tcp_download_vs_dslreports.png
>
> Puzzled, I
>
> repeated  the pie with no ecn test:
>
> http://www.dslreports.com/speedtest/377727
>
> turned off ecn for a fq_codel test on the tcp itself:
>
> http://www.dslreports.com/speedtest/377765
>
> and for this fq_codel test, dropped the inbound shaper from 115 mbit
> down to 110, which did improve matters somewhat.
>
> http://www.dslreports.com/speedtest/377786
>
>
> [1] both ns2_codel and cake are experimental
> --
> Dave Täht
> Open Networking needs **Open Source Hardware**
>
> https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67



-- 
Dave Täht
Open Networking needs **Open Source Hardware**

https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67