[Cake] cake flenter results round 3

Dave Taht dave.taht at gmail.com
Thu Nov 30 01:28:20 EST 2017

On Wed, Nov 29, 2017 at 3:18 PM, Pete Heist <peteheist at gmail.com> wrote:
> http://www.drhleny.cz/bufferbloat/cake/round3/
> Round 3 Tarball: http://www.drhleny.cz/bufferbloat/cake/round3.tgz
> *** Notes/Analysis ***
> * And another couple hundred tests showing Cake doesn’t crash, at 20/20mbit
> either!
> * I’m now using netns (thanks Dave/Georgios) with a five box setup: client,
> client router, delay, server router and server. Delay is set up to simulate
> a 20mbit/20mbit symmetric connection with “bandwidth 20mbit delay 10ms” on
> each of its two interfaces. That apparently doesn’t hard limit the
> bandwidth, but no matter, I do get a 20ms RTT as expected, and any tests
> with rate limiting use a default limit of 18mbit, which seems to control the
> queue well. The unlimited tests can probably be ignored.
> * Now that my CPU can actually run this test, Cake shows good results vs
> fq_codel on 32/32 nflows:
> http://www.drhleny.cz/bufferbloat/cake/round3/nflows_32_32_eg_fq_codel_18.0mbit/index.html
> http://www.drhleny.cz/bufferbloat/cake/round3/nflows_32_32_eg_cake_18.0mbit/index.html
> * OWD, IPDV (jitter) and lost packets looking good for a VoIP conversation
> with dual-whatever. The VoIP conversation is simulated along with a normal
> RRUL test (4/4 flows), a torrent, and tcp_12down simultaneously (family of
> four?)
> http://www.drhleny.cz/bufferbloat/cake/round3/flowiso_mix_eg_cake_dsrc_cake_ddst_18.0mbit/voip-voip_delay_loss.svg
> *** Round 4 Plans
> * All I can do easily with this setup without more effort is vary rtt,
> bandwidth, loss or whatever else netem can do. Or I can add other tests with
> spreads of parameters. Sorry, no asymmetric rates or useful ack filtering
> tests. Anyone care for high rtt tests, low bandwidth tests like 2/2mbit, or
> anything else in particular?

well, he says, shyly, there's a new option to netem, called slotting.
delete the rate, "slot 4ms 4ms bytes 10k 16"

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Dave Täht
CEO, TekLibre, LLC
Tel: 1-669-226-2619

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