[Cake] Long-RTT broken again

[Dave Taht]

I note that truesize is a bad indicator for tests on the rx path where
acks are usually 2k.
Dave Täht
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On Sat, Nov 7, 2015 at 12:02 AM, Jonathan Morton <chromatix99 at gmail.com> wrote:
>
>> On 6 Nov, 2015, at 16:15, Toke Høiland-Jørgensen <toke at toke.dk> wrote:
>>
>> Added a run with Reno to the same directory. Smoother, but worse overall
>> throughput.
>
> Yes, looks like it’s ramping up the slow way, and hasn’t reached the BDP by the time the test run ended.
>
> However, it also looks like it’s properly ack-clocked, unlike CUBIC, so while it’s still bursty, it isn’t overflowing the buffer except during slow-start.
>
> The fact that slow-start terminates (due to loss) after only a few RTTs is suspicious.  What parameters are you giving to netem?  I note that the default packet limit in netem is 1000, which is 1.5MB...
>
>  - Jonathan Morton
>
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