[Cake] FreeNet backhaul

Dave Taht dave.taht at gmail.com
Thu Sep 6 18:58:10 EDT 2018

Heh. esfq was "best in class" for a very, very long time.

I have years of mrtg data on my network that I haven't looked at in years....
On Thu, Sep 6, 2018 at 3:37 PM Pete Heist <pete at heistp.net> wrote:
> I met with the FreeNet Liberec admins earlier this week, and am just starting to get the first IRTT / SmokePing probe data from a few backhaul routers. I’ll see if I can get snapshots of the SmokePing pages public somewhere, but for now...
> https://www.heistp.net/downloads/jerab_ping.pdf
> https://www.heistp.net/downloads/jerab_irtt.pdf
> On this router, there are various “events” that occur with RTT spikes, and in general, UDP RTT maximums appear quite a bit higher than those for ICMP. I speculate that at least some of these events may be bloat, but can’t be sure yet.
> This router is an old ALIX with kernel 2.6.26, but on the other hand it does have hfsc + esfq (a variant of sfq with host fairness) deployed, so if it’s actually controlling the queue, one might suspect that sfq it could control inter-flow latency at least somewhat.
> I feel the need for better data than this, but this is at least a first look for me at bloat in an ISP’s backhaul. The “elaborate” plan is to gather data for a while, deploy sqm in a couple places (I hope for cake, but the kernel will need to be upgraded on this one), and see what happens… :)
> Pete
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Dave Täht
CEO, TekLibre, LLC
Tel: 1-669-226-2619

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