[Cerowrt-devel] ingress rate limiting falling short

[Aaron Wood <woody77@gmail.com>]

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I wrote this up on my blog, where I can intersperse text and graphs a bit
better:

http://burntchrome.blogspot.com/2015/06/htb-rate-limiting-not-quite-lining-up.html

Basically, I ran a series of tcp_download tests, using increasing ingress
rates with sqm_scripts, and then used flent's box-plots to put the results
into a combined image for comparing.

On the 3800, it never meets the rate, but it's only off by maybe 5%.  But
on my new WRT1900AC, it's wildly off, even over the same performance range
(I tested it from 80-220Mbps rates in 20Mbps jumps, and saw from 40-150Mbps.

I have no idea where to start looking for the cause.  But for now, I'm just
setting my ingress rate MUCH higher than I should, because it's working out
to the right value as a result.

-Aaron

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