[Cake] cake flenter results round 0

Dave Taht dave.taht at gmail.com
Sun Nov 26 12:45:48 EST 2017

On Sun, Nov 26, 2017 at 1:47 AM, Pete Heist <peteheist at gmail.com> wrote:
> On Nov 26, 2017, at 9:42 AM, Dave Taht <dave.taht at gmail.com> wrote:
> That is a really, really long, and extremely pleasant, way of saying:
> "OK, it doesn't crash".
> :)
> can flenter work with the veth stuff and namespaces?
> Maybe a little more than that, but not much more. :) I put it on git for
> reference: https://github.com/peteheist/flenter
> So far no to the veth and namespace support, but I don’t see why it
> couldn’t. A flenter “rig" includes up to six roles. In this test I’m only
> using four since it’s not over p2p wifi: client, client router, server
> router and server. The script doesn’t care where those are as long as it can
> ssh to them without a password so it can run flenter_shell.sh to do its
> setup and run flent on the client. My dream was that you could just define
> your rig with a few parameters, run it, and enjoy all the results. That
> dream is still more of a waking nightmare as you have to modify the tests
> based on what your rig can do.
> I think the most important thing to making the tests more relevant for cake
> after "round 1” changes is using different bandwidths and rtts, right? I
> could use netem for this.

the real test of a aqm is how it handles a range of rtts in real traffic.

While a simple, useful test is merely to insert delays of say, 20, 40, 80, 160ms
inline with

a real test would have multiple tcp targets of those delays.

The main trick with using netem properly is to not have it be the
bottleneck link, and have a huge packet limit, so it doesn't turn into
your tail loss queue.

>The use of veth and namespaces is mainly for
> getting it to run on one box, right? Where’s the latest code for that, btw?

It's not up anywhere yet, I was heads down on cleaning up cake.

> I’m a little lost as to whether or if I need to be using net-next, if I can
> just use the current netem I have, where to get the latest netem and veth /
> namespaces stuff, etc...

A whole lotta namespace stuff landed in net-next, some of which I was
probably leveraging.

I kind of need to go heads down this week on finishing up the slotting
feature in iproute2. And looking over the cake codebase there.


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

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