Re: [Cerowrt-devel] Problems testing sqm

[Dave Taht <dave.taht@gmail.com>]

Another thought is that this hardware agressively does GRO - 64k
"packets"really messes up htb. We already showed that problem in the
previous generation.

which we fixed in cake... Turn off all ethernet offloads and try again?

I have no idea what else is going wrong.
Dave Täht
I just lost five years of my life to making wifi better. And, now...
the FCC wants to make my work, illegal for people to install.
https://www.gofundme.com/savewifi


On Fri, Oct 23, 2015 at 6:10 PM, Richard Smith <smithbone@gmail.com> wrote:
> I have a shiny new Linksys WRT1900ACS to test.
>
> I thought it might be nice to start with some comparisons of factory
> firmware vs OpenWRT with sqm enabled.
>
> So I built and installed an openwrt trunk but the results were very
> non-impressive.  Rrul test reported mulit-seconds of latency and it was
> equally non-impressive with sqm enabled or disabled.  So I assumed that sqm
> in trunk on this device must not work yet.  Then I wondered how well sqm in
> trunk was tested and that perhaps its broken for all devices.
>
> So I tested openwrt trunk on my Netgear 3700v2 and saw the same results.
> Then I tried openwrt cc and got the same results.
>
> Finally, I went to the reference implementation: cerowrt 3.10.50-1 on my
> 3700v2.  Same results.
>
> So at this point I'm thinking there's a PEBKAC issue and I'm not really
> turning it on.
>
> Here's my enable procedure:
>
> Go the sqm tab in the GUI and set egress and ingress to 10000, set the
> interface to the upstream interface,  click enable, click save and apply.
> Everything else is left at default. ie fq_codel and simple.qos.
>
> I've also tried a reboot after enabling those settings and then gone back to
> the gui to verify they were still set.
>
> My test setup:
>
> Laptop<--1000BaseT-->DUT<--1000baseT-->Server
>
> I run netperf-wrapper -H Server -l 30 rrul and look at the 'totals' or 'all'
> plot.
>
> If I run the above with this setup.
>
> Laptop<--1000baseT-->Server
>
> Then I get the expected 800-900Mbit/s with latencies < 15ms.  So I don't
> think there's a problem with my test infrastructure.
>
> What am I missing and or what's the next step in figuring out whats wrong?
>
> --
> Richard A. Smith
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