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

Felix Fietkau nbd at nbd.name
Sun Feb 3 08:54:40 EST 2019

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 since 
> 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 patches 
> applied, and the connection kept working but page loading in the 
> browser e.g. would occasionally be slow (nothing else chewing on my 
> 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 hang on 
> my laptop: I was unable to ping anything, web pages stopped loading 
> 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 the bug 
> report.
Thanks, that information was very helpful. Did you run those tests on
2.4 GHz or 5 GHz?

> Since that hang already happened within the hour, I ran a new build 
> 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 afternoon, 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 OKNo 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


- Felix

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