[Make-wifi-fast] On the 802.11 performance anomaly and an airtime fairness scheduler to fix it

David Lang david at lang.hm
Sun Jul 3 03:06:02 EDT 2016

On Sun, 3 Jul 2016, Luca Muscariello wrote:

> Toke,
> great piece of work.
> UDP tests show that the scheduler is working quite well.
> TCP tests: no news that ACK streams are a problem.
> This is another well known issue  in wifi.
> Every data packet is ACKed already at L2 and L4
> sends an ACK that is non contention free.
> There is an NSDI paper in 2014 that proposes to use the L2 ACK to carry the
> L4 ACK.
> It works well but purists might hate that approach.

do they delay the L2 Ack until the L4 ack comes back? If so, how does that work 
on long-latency connections where it takes a long time for the L4 ack to show 

David Lang
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