[OpenWrt-Devel] mt76 issues on 18.06 HEAD - was: 18.06.2 branching/builds

Stijn Segers foss at volatilesystems.org
Thu Feb 7 10:38:44 EST 2019

Felix Fietkau <nbd at nbd.name> schreef op 7 februari 2019 14:30:51 CET:
>On 2019-02-04 22:57, Stijn Segers wrote:
>> Op zondag 3 februari 2019 om 14:54 schreef Felix Fietkau
><nbd at nbd.name>:
>>> On 2019-02-02 19:08, Stijn Segers wrote:
>>>>  Hi Felix,
>>>>  I built 18.06 HEAD with your 2019-01-30 bump, and with the
>>>>  mt76-disable-edcca.patch applied. That seemed very stable (up
>>>>  30/01 evening, very high throughput - never seen anything close to
>>>> 50
>>>>  MBps on my 2x2 client before; I barely got close to 25 MBps 
>>>> before). No
>>>>  laggy feeling, so didn't check ping. Wireless wasn't used in the
>>>>  morning or the day, but I have tried to stress it in the evening
>>>>  (31/01) -transferred about 65 GiB of data over the WLAN (scp). No
>>>>  hiccups whatsoever.
>>>>  I then reverted to vanilla 18.06 HEAD 31/01, so none of the
>>>>  applied, and the connection kept working but page loading in the
>>>>  browser e.g. would occasionally be slow (nothing else chewing on
>>>>  network connection). I checked ping, and it was all over the place
>>>>  again (from sub-milliseconds to 10 ms, occasionally 100ms to other
>>>>  devices on the LAN). I suppose there's no real value in those 
>>>> numbers,
>>>>  but it does quantify the feeling of the wireless 'choking' 
>>>> momentarily,
>>>>  then picking up again. After like half an hour, wireless would
>>>> on
>>>>  my laptop: I was unable to ping anything, web pages stopped
>>>>  altogether. Same thing on my smartphone. However, when I disabled
>>>>  wireless on both clients, then turned it on again, the connection
>>>>  started working once more; that didn't happen on the previous mt76
>>>>  bumps. There the radio would just seem to die like explained in
>>>> bug
>>>>  report.
>>> Thanks, that information was very helpful. Did you run those tests
>>> 2.4 GHz or 5 GHz?
>> Hi Felix,
>> 5 GHz only (I don't use the 2,4 GHz radio).
>>>>  Since that hang already happened within the hour, I ran a new
>>>>  with the most recent mt76 bump (2019-01-31) together with the 
>>>> 'disable
>>>>  edcca' patch. That has been working fine so far (although I'm not
>>>>  hitting 50 MBps anymore :-P ). It's been up since Friday
>>>> so
>>>>  almost 30 hours now. The radio gets shut down at night, but I've 
>>>> been
>>>>  using it for hours and no issues as far as I can tell.
>>>>  Do you want me to try the second patch, or is this OK
>>> No need. I've pushed a whole bunch of ED/CCA related patches to 
>>> mt76.git
>>> (haven't bumped OpenWrt git yet).
>>> Could you please test that latest version (commit
>>> e301f2349a191c845b6bd2d487e64591ac2ed64d)?
>> I just rebuilt your 2019-02-03 bump (copied the Makefile from master
>> the 18.06 package feed), installed the kmods on top of my existing 
>> 18.06 build and rebooted.
>> Initially it seemed fine, although the connection seemed a bit laggy
>> first but that stabilised. My smartphone then just disconnected after
>> an hour (router uptime 1:15' +-) and the AP was not visible anymore 
>> despite 'wifi status radio0' saying it was still up. Dmesg was 
>> completely silent (nothing related to mt76 or the AP dying).
>> 'Wifi reload' brought it back temporarily - it then only took a few 
>> minutes to go down again though, for the AP to disappear again and
>> second time the MCU timeout messages reappeared like in the bug
>> on Flyspray.
>> I didn't have either of your previous patches applied (so 'vanilla' 
>> mt76 2019-02-03). I'm rolling back to vanilla 18.06 + your ED/CCA
>> for now. If you need any other info/need me to test/check other
>> let me know. (I hope this is software and not dying hardware, I 
>> wouldn't be able to tell the difference.)
>> Thanks for your help already so far.
>Thanks for testing!
>Does this issue happen for you only on 2.4 GHz, or also on 5 GHz?
>My patches seem to have resolved the hang for at least one other user.
>I suspect that this is way more likely to happen on 2.4 GHz because of
>all the extra noise, so I'm considering disabling ED/CCA for 2.4 GHz.
>- Felix

Hi Felix,

I don't know I'd my reply got caught in the chain or if you read it the other way around - but I'm only using 5 GHz.



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