[Cake] cake flenter results round 4

[Pete Heist]

http://www.drhleny.cz/bufferbloat/cake/round4/ <http://www.drhleny.cz/bufferbloat/cake/round4/>

Round 4 Tarball: http://www.drhleny.cz/bufferbloat/cake/round4.tgz <http://www.drhleny.cz/bufferbloat/cake/round4.tgz>

*** Notes/Analysis ***

* I took the average satellite Internet latency of 638ms (https://en.wikipedia.org/wiki/Satellite_Internet_access) and tried 20/20mbit 320ms delay each direction. So here we have 20mbit symmetric Internet with Cake running on both the CPE and satellite- common config! I’m sorry we don’t have Tooway 6/22mbit anymore for a real test, which was also here in desperation at the house at some point.

* Since I left the default rtt setting for most tests, these tests are an exploration of what problems that can cause. I enjoy failed experiments though (I’m looking at you penicillin). Here we can see that as we increase Cake’s rtt setting, total bandwidth improves, generally:

http://www.drhleny.cz/bufferbloat/cake/round4/cake_rtt_200ms_rrulbe_eg_cake_18.0mbit/index.html <http://www.drhleny.cz/bufferbloat/cake/round4/cake_rtt_200ms_rrulbe_eg_cake_18.0mbit/index.html> (22.77mbit)
http://www.drhleny.cz/bufferbloat/cake/round4/cake_rtt_400ms_rrulbe_eg_cake_18.0mbit/index.html <http://www.drhleny.cz/bufferbloat/cake/round4/cake_rtt_400ms_rrulbe_eg_cake_18.0mbit/index.html> (26.17mbit)
http://www.drhleny.cz/bufferbloat/cake/round4/cake_rtt_600ms_rrulbe_eg_cake_18.0mbit/index.html <http://www.drhleny.cz/bufferbloat/cake/round4/cake_rtt_600ms_rrulbe_eg_cake_18.0mbit/index.html> (25.99mbit)
http://www.drhleny.cz/bufferbloat/cake/round4/cake_rtt_800ms_rrulbe_eg_cake_18.0mbit/index.html <http://www.drhleny.cz/bufferbloat/cake/round4/cake_rtt_800ms_rrulbe_eg_cake_18.0mbit/index.html> (25.96mbit)
http://www.drhleny.cz/bufferbloat/cake/round4/cake_rtt_1000ms_rrulbe_eg_cake_18.0mbit/index.html <http://www.drhleny.cz/bufferbloat/cake/round4/cake_rtt_1000ms_rrulbe_eg_cake_18.0mbit/index.html> (29.04mbit)

* Cool. In this case, increasing rtt actually _improves_ host fairness, as opposed to what we see with Ethernet around rtt 1ms, although TCP RTT suffers:

http://www.drhleny.cz/bufferbloat/cake/round4/hostiso_cake_200ms_eg_cake_src_cake_dst_18.0mbit/index.html <http://www.drhleny.cz/bufferbloat/cake/round4/hostiso_cake_200ms_eg_cake_src_cake_dst_18.0mbit/index.html> (1.83)
http://www.drhleny.cz/bufferbloat/cake/round4/hostiso_cake_400ms_eg_cake_src_cake_dst_18.0mbit/index.html <http://www.drhleny.cz/bufferbloat/cake/round4/hostiso_cake_400ms_eg_cake_src_cake_dst_18.0mbit/index.html> (1.64)
http://www.drhleny.cz/bufferbloat/cake/round4/hostiso_cake_600ms_eg_cake_src_cake_dst_18.0mbit/index.html <http://www.drhleny.cz/bufferbloat/cake/round4/hostiso_cake_600ms_eg_cake_src_cake_dst_18.0mbit/index.html> (1.57)
http://www.drhleny.cz/bufferbloat/cake/round4/hostiso_cake_800ms_eg_cake_src_cake_dst_18.0mbit/index.html <http://www.drhleny.cz/bufferbloat/cake/round4/hostiso_cake_800ms_eg_cake_src_cake_dst_18.0mbit/index.html> (1.45)
http://www.drhleny.cz/bufferbloat/cake/round4/hostiso_cake_1000ms_eg_cake_src_cake_dst_18.0mbit/index.html <http://www.drhleny.cz/bufferbloat/cake/round4/hostiso_cake_1000ms_eg_cake_src_cake_dst_18.0mbit/index.html> (1.06)

* Sorry for the delay and not testing much in the last few days. R.I.P. our 16yo European housecat who left us yesterday. I really liked that cat. I’ve enjoyed looking at some of George’s results meanwhile...

*** Round 5 Plans

* If I do another high RTT test, make rtt 1000ms default and try even higher

* From Dave: tcp bbr, cdg, reno? dctcp would be weirdly interesting.

* From Dave: slot 4ms 4ms bytes 10k 16

* If I get time I could change flenter to do asymmetric bandwidth tests and go back to Dave’s four box config with ingress cake, which would probably be a more common config. All depends on time available…

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