[technique] 802.11ac / ath10k : Performance v/s signal quality graph.

[Laurent GUERBY]

Bonjour,

Un graphique interessant de signal vs debit sur un
lien "laboratoire" via coax+attenuateur entre deux cartes Compex
WLE900VX (ath10k) 802.11ac. On voit bien
les paliers de modulation, et le max effectif UDP autour
de 800 Mbps.

Laurent

-------- Message transféré --------
De: Ben Greear <greearb at candelatech.com>
À: ath10k <ath10k at lists.infradead.org>
Sujet: Performance v/s signal quality graph.
Date: Fri, 25 Jul 2014 16:15:26 -0700

Some time back, I ran some tests, and someone (sorry, can't remember or find the email)
suggested my signal might be too hot.  I was using a 30 db fixed attenuator inline with the SMA
cables.

I set up a test today with E5 processor system as station, and a fast i7 processor
system as AP, with the two systems cabled through our variable attenuator.  Open authentication,
channel 149, other wifi equipment in area on 5ghz was (mostly) idle or powered down.
Kernel is 3.14.13+, latest ath10k CT (10.1.467 based) firmware on both systems
(though I don't think that matters much for throughput tests).  10 virtual stations
configured on station machine, but only one was actively doing traffic.

Here is a udp download v/s rx-signal graph as the attenuator is stepped from 0 to 95.5
db attenuation in .5 db steps.

http://www.candelatech.com/pdfs/ath10k_atten_vs_throughput.pdf

The rx-signal axis is the left hand side.  The green graph is the station's (ie netdev)
rx bps, the black is UDP goodput.

It seems ath10k (WLE900VX) has no real trouble with hot signals, and runs best between
-15 and -52 rx signal level (as reported by the station device).

Our systems are not perfectly isolated, so the maximum attenuation is around -85.

Enjoy,
Ben

-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com


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