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* [Bloat] different speeds on different ports? (benchmarking fun)
@ 2017-08-30  5:15 Aaron Wood
  2017-09-21  2:06 ` Dave Taht
                   ` (4 more replies)
  0 siblings, 5 replies; 11+ messages in thread
From: Aaron Wood @ 2017-08-30  5:15 UTC (permalink / raw)
  To: bloat


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I don't have a full writeup yet, but wanted to ask if people on here have
run into this.

I'm seeing a disparity between flent and the dslreports speed tests.  On my
connection at home (Comcast 150/12), I figured it was something related to
the test implementations, but minor.  But on a connect at a friend with
business-class Comcast (300/12), we're seeing a huge difference.  Flent
can't seem to achieve more than 120Mbps, often with an early, couple-second
hump at a much higher speed.  But dslreports' speed tests gets the full
300Mbps.

In looking closer at my connection, with sqm (cake) turned off, I'm seeing
~180Mbps download with 500ms of bufferbloat when I use the dslreports test (
http://www.dslreports.com/speedtest/20805152).

Yet flent can't come close to that, even with the tcp_12down test:

​
The current hypothesis that we have is that this is due to either traffic
class, or the ports that traffic are running on.  I've ruled out the ping
streams, as a parallel set of netperf tcp_maerts downloads has the same
120Mbps roof.

It would be interesting if we could run some netperf tests using port
80/443 for the listening socket for the data connection (although if doing
deep-packet inspection, we might need to use an actual HTTP transfer).

-Aaron

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^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2017-09-23  2:51 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-08-30  5:15 [Bloat] different speeds on different ports? (benchmarking fun) Aaron Wood
2017-09-21  2:06 ` Dave Taht
2017-09-21  2:34 ` Dave Taht
2017-09-21 10:58 ` Stefan Alfredsson
2017-09-21 11:16 ` Toke Høiland-Jørgensen
2017-09-21 12:51   ` Sebastian Moeller
2017-09-22  0:26   ` David Lang
2017-09-21 14:50 ` Colin Dearborn
2017-09-21 15:13   ` Aaron Wood
2017-09-21 15:16     ` Aaron Wood
2017-09-23  2:51       ` Aaron Wood

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