On Mon, 18 Apr 2016, Dave Taht wrote:
(and there will be a large chunk
of airtime unused for various reasons, much of which you will not be able to
attribute to any one station, and if you do get full transmit data from each
station, you can end up with >100% airtime use attempted)
The "black" lines on the pie chart would represent the interframe gap,
you could use a color for "other things" like mgmt frames or
interference (if you have the data), go "grey" or transparent for
unused txops.
I really wanted to be able to show the "pulse" that multicast
powersave induces every ~250ms (could also use that to change the
chart to show what stations are active), and pulses like upnp and
other big pieces of multicast traffic can induce, also, by making the
whole pie chart flash for the actual duration it took, while the sweep
hand went 'round.
well, in the 'river' chart, such pulses are going to stand out as well (assuming
you are displaying things to a suitable resolution.
Trying to have them show up in a pie chart seems hard. Are you really going to
update the entire pie chart 4 times/sec? how is anyone going to see what's what
when things are changing that fast?
Similarly, mu-mimo "soundings" - although they are very short, could
be shown, and I dunno how to show multiple stations going at once in
that mode.
(the spec suggests soundings be taken every 10ms (and take up to
500usec!!!), which is nuts. First you need per-station airtime
scheduling and queuing, then, IF you have MU-mimo capable stations
with data waiting for them, sound... and even then the only major
cases where I think this feature is going to help all that much is in
very, very dense environments, which have other problems)
I would be looking at a stacked area graph to show changes over time (a
particular source will come and go over time)
I would either do two graphs, one showing data successfully transmitted, the
other showing airtime used (keeping colors/order matching between the two
graphs), or if you have few enough stations, one graph with good lines
between the stations and have the color represent the % of theoretical peak
data transmission to show the relative efficiency of the different stations.
Noted.
While the radar sweep updating of a pie graph is a neat graphic, it doesn't
really let you see what's happening over time.
Disagree. At least on a testbench I'm pretty sure a "good" pattern
could be recognisable against other traffic.
what information do we need to test this?
We've got the reports from /sys for the scale APs, is this sufficient? or do you
really need something reporting >once/sec?
David Lang
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