[Cerowrt-devel] [Make-wifi-fast] wifi airtime fairness patches could use eyeballs and testing

Toke Høiland-Jørgensen toke at toke.dk
Wed Aug 10 18:05:52 EDT 2016

Dave Taht <dave.taht at gmail.com> writes:

> On Wed, Aug 10, 2016 at 11:50 PM, Toke Høiland-Jørgensen <toke at toke.dk> wrote:
>> Toke Høiland-Jørgensen <toke at toke.dk> writes:
>>> On 10 August 2016 21:35:40 CEST, Dave Taht <dave.taht at gmail.com> wrote:
>>>>Wow, that *is* weird. It is good to see the tcp window changing on
>>>>this set of data (it wasn't before), and CWRs, but... hmmm... SCIENCE.
>>>>Enabling ecn on both sides will rule out some potential bugs.
>>> Yeah, couldn't get ecn to work on the host I was using as the other endpoint on
>>> that test. Will try with another box that's not on quite as ancient a kernel.
>>> Was also planning to disable codel (by setting a very high target) to try to
>>> narrow down the problem.
>> OK, digging some more on this:
>> I am seeing *no* drops by CoDel, and no backlog in the mac80211 softq
>> layer either (or at most one or two packets when polling with a 1 sec
>> interval). This is with one as well as with two flows.
> But there are tons of drops evident from the captures.

Well the CoDel drop counter stays completely flat. There are cwnd
reductions, yes, but are they drops? My thought was that they were
retransmissions caused by OOO packets?


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