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

Sebastian Moeller moeller0 at gmx.de
Fri Jun 26 05:46:19 EDT 2015

Hi Mikael,

thanks a lot.

On Jun 24, 2015, at 13:31 , Mikael Abrahamsson <swmike at swm.pp.se> wrote:

> On Tue, 23 Jun 2015, Sebastian Moeller wrote:
>> As Dave said it would be nice see RRUL data from the same testbed. It would be so nice if flint had a way to send different sized TCP packets… (I guess this might be faked with MSS clamping in the router and relaying on path MTU discovery?)
> What kind of tests should I run? I have rrul results now, both at the same time as running iperf3.

	This is interesting. I also like the way iperf3 reports retransmits (BTW way how does it know this, I thought the kernel does the retransmits under the hood out of sight of applications). Since RRUL does not have such a nice report as iperf3 I will not be able to calculate the difference to the theoretical maximum transfer rates (also I lack insight on the ACK traffic). 

> I set iperf3 to run with 10 parallel streams, different MSS per test, and let it run for 30 seconds into the rrul test.

	The plots are interesting, even though I have a hard time with the logarithmic scale.

> So in all the tests, iperf3 session stops running half way into the rrul test.

	I like how the RRUL flows soak up the newly available bandwidth.

> I set sqm to 500M up and down on eth0, ECN up and down, and not to squash DSCP in any direction.

	I will have a look at the flint files, but it looks like the 1200ac does 500Mbps bidirectionally with SQM, so this looks like a decent machine for the present and (near?) future. Now I just need to wait until prices come down a tad (I hope that the 1900AC v2 release should drop the 1200ac’s process a bit).

Thanks for the tests, now I know what router to try next (the edgerouterX, which I had eyed as a replacement for the shaper in the wndr3700 tops out at 130K packets per second and hence will not really work that well for a 100/40 Mbps link).

Best Regards

> http://swm.pp.se/aqm/rrul-wrt1200ac-150624.pdf
> Tell me if there is more information I can provide or tests to run.
> -- 
> Mikael Abrahamsson    email: swmike at swm.pp.se

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