On 12/17/2019 06:12 PM, Sebastian Gottschall wrote:
i dont know what you want to compare here.
1. you compare 2 different wifi chipsets. both have different sensititivy and overall output power spec
2. both have different amount of antenna chains. which does make a difference in input sensitivity
3. the patch ben made has no effect on qca9880 chipsets. it only takes effect on 10.4 based chipsets like 9984
The part of my patch that sums secondary frequencies should apply to wave-1 as well, but I have
not verified that yet.
about noise floors in general. noise floors of -108 are bogus. there is a physical limit a noise level can be.
since drivers like ath9k are doing a cyclic calibration, the noise value might indeed change. but this calibration is
not running in realtime. its cyclic. i'm not aware if chipsets like qca988x are going the same way, but since qca988x
has sime similaries with ath9k chipsets unlike the newer 9984 variants, it could be. the 30 seconds mentioned
in the bug report fits to my expectations of the early noisefloor calibration which has a short delay and after success
turning to use a long delay. anyway. in this early calibration phase signals might change and will stabilize after. this isnt a issue
since your connection will work anyway even if it might take a little bit longer if you have poor signal levels
@ben. am i wrong or what do think?
I don't know enough about how the noise floor calculations are done or how the apply to settings
to know the answer.
I will be happy in general if ath10k wave-1, wave-2, and ath9k report similar RSSI for similar
setups.
If you look at the tx-rate-power table in ath10k, for instance, you can see different MCS are transmitted
at different signal levels. So, some change from initial conditions might be because higher MCS is
being transmitted after rate-ctrl scales up?
Lots of moving parts...
Thanks,
Ben
Sebastian
Am 18.12.2019 um 00:37 schrieb Tom Psyborg:
also noticed now that the noise floor changes with signal strength as
described in this bug report:
https://www.mail-archive.com/ath10k@xxxxxxxxxxxxxxxxxxx/msg11553.html
after wifi restart
iwinfo:
signal: -59dBm noise: -108dBm
then goes to
signal: -52dBm noise: -103dBm
and finally drops to
signal: -59dBm noise: -103dBm
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
