[Cake] Long-RTT broken again

Toke Høiland-Jørgensen toke at toke.dk
Thu Nov 5 09:36:04 EST 2015

Jonathan Morton <chromatix99 at gmail.com> writes:

> So, again - what’s going on?  Are there any clues in packet traces
> with sequence analysis?

So, reran and took traces. Data and packet dumps at:

There's two runs: the first one is what's in git now, the second one
patches the byte accounting to use the packet length rather than the
truesize, which helps a bit but is still inadequate.

The packet dumps and cake stats output agree: cake is running out of
buffer size. ECN is enabled on this test, and there's not a single mark
performed, but several thousand drops.

So something is definitely wrong with the buffer sizing.


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