[Make-wifi-fast] Where is the bloat in WiFi?

[Michael Welzl <michawe@ifi.uio.no>]

Hi all,

A simple question to y'all who spent so much time on Cake and things ...   in a household using WiFi, which buffer is usually bloated? Where does the latency really come from?

Is it:
1. the access point's downlink queue, feeding into the WiFi network,
2. the modem's downlink queue, feeding into the access point,
3. the modem's uplink queue,
4. the access point's uplink queue towards the modem   (hm, that seems silly, surely the AP-modem connection is fast... so perhaps, instead: the queue in the host, as it wants to send data towards the access point)

or is it a combination of these?

I guess that, with openwrt, Cake is operating on the queue that's feeding the wifi network, as the modem's queue is out of its control... so: is this where the bottleneck usually is?

Just wondering about your views and experiences.

Thanks in advance!

Cheers,
Michael

--
PS: my personal guess: 1 and 3 above are the most common. But that's *pure* guesswork!