[Cerowrt-devel] performance numbers from WRT1200AC (Re: Latest build test - new sqm-scripts seem to work; "cake overhead 40" didn't)

Mikael Abrahamsson swmike at swm.pp.se
Sat Jun 27 01:50:02 EDT 2015

On Fri, 26 Jun 2015, Dave Taht wrote:

> your results are showing basically tail drop behavior. Although I
> would have expected intrinsic delay on the link to crack 100mbits on
> the rrul test, not 20ms (which is still high), and you only hit 7 on
> the single threaded tcp up test, based on what I saw in the driver.
> turn off sqm, stay at 100mbit, let fq_codel ride, try the rrul_50_up
> test. Also do a capture to see if CE was ever exerted.


I have a capture of this as well, it's 1.5gigs. It has lots of mentions of 
ECT(0) but 0 mention of ECT(1). TOS should be 0x3 when the EC=1 ? I see no 
such packets. All the packets are 0x2.


I went back to gig and set SQM to 50 megabit/s bidirectional and looking 
at tc qdisc -s eth0 I see ecn_mark 10339 on a single queue, none of the 
others have non-zero ecn_mark.

> I do not know why my linksys ac1200 build does not work. I generally
> suspect it is because my big build server is getting ancient. Can you
> send me your .config file for openwrt?


This was my first try, I haven't fine tuned it yet, but it works (boots 
and moves packets anyway :P )

> It would be VERY helpful if you pulled from ceropackages-3.14, and
> added and built kmod-sched-cake and tc-adv and switched to using the
> ceropackages feed also for luci-app-sqm and sqm-scripts. There are a
> couple people here that would probably leap on that! :)

I will give it a go in the next few days.

Mikael Abrahamsson    email: swmike at swm.pp.se

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