[Bloat] bufferbloat at high edge rates

Stefan Alfredsson stefan.alfredsson at kau.se
Wed Nov 16 01:00:16 EST 2016

I had the same problem, getting no bloat report. I tested just now 
running as root, and got bloat measurements in 
http://www.dslreports.com/speedtest/6166098 and 

 From Firefox, I get somewhat higer latency (~100 ms) versus ~20-60 ms 
via the command line client:


Two things to note:

- Firefox tests were run yesterday at around lunchtime  (~12.00 CET), 
and CLI tests just now (~06.40 CET). So time-of-day effect may be a 
reason for less bloat now. I'll do a better comparison when I get to my 

- CLI tests were run in a docker container, for security purposes. I 
used host networking so it should not have affected measurements much, 
but still. This was how it was executed:

// downloaded the dslreports cli tool to my host /tmp directory, mapping 
/tmp to /host in the debian container

$ docker run --rm -t -i -v /tmp:/host:ro debian

root at db0ea060caa7:/# apt-get update ; apt-get install ca-certificates
[... snip ...]
root at db0ea060caa7:/# /host/dslrcli-linux-amd64
Selecting nearest servers....
Download Testing.....
Upload Testing.....
Uploading results...
Download : 883.56 Megabit/sec Upload : 895.32 Megabit/sec

A better option would be using CAP_NET_RAW, I'll see if this works 
instead of running with full root privs.


On 16/11/16 05:09, jb wrote:
> It has to run as root / Admin in order to do ICMP in order to test 
> buffer bloat.
> If you run it under a non privileged user account it cannot get 
> permission for ICMP, so although it locates the nearest servers using 
> http ping, it isn't doing any buffer bloat testing.
> I'm not sure that is the issue but that's the first thing that comes 
> to mind..
> On Wed, Nov 16, 2016 at 11:34 AM, David Lang <david at lang.hm 
> <mailto:david at lang.hm>> wrote:
>     On Tue, 15 Nov 2016, jb wrote:
>         The command line tool is available to anyone now (Windows, OSX
>         and linux),
>         it does buffer bloat probing, using ICMP if run as root, and
>         is immune to
>         any browser issues. It can be downloaded here from the sticky:
>         http://www.dslreports.com/forum/speedtestbinary
>         <http://www.dslreports.com/forum/speedtestbinary>
>     This does not seem to be reporting any bloat info (I've run it a
>     couple times)
>     http://www.dslreports.com/speedtest/6156013
>     <http://www.dslreports.com/speedtest/6156013>
>     David Lang
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