[Solved] Strange 5g to 2.4g transition of clients

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msoengineer
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PostPosted: Fri Sep 04, 2020 21:15    Post subject: Reply with quote
bushant wrote:
R7800 running r44299

Probably useless information for you
since I use unique SSID on both bands.

HTC One M8 stays connected (about 8 Hrs now) to 5Ghz till I roam out of range
then switches to 2.4Ghz then switches back to 5Ghz when back in range.

I have not noticed any change in this behavior.

Her Galaxy S6 staying connected to 5Ghz (4+ Hrs now)and switches to 2.4 when moving out of range
only does not switch back to 5Ghz when back in range.

I don't fool with this device so I don't know about earlier builds.

Neither switch seamlessly but that is trivial.


Yeah, irrelevant to my situation...

this is not the famous android issue of devices not going back on 5ghz when in range...this is a new issue with immobile clients that would always use 5g now going to 2.4g.... nearly all are intel 8260...win 7, win 8 and win 10...and none had their drivers updated for many months....

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kernel-panic69
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PostPosted: Fri Sep 04, 2020 21:57    Post subject: Reply with quote
If you're not forcing your Winblows clients to use the 5GHz band only, that is probably part of the problem. Advanced settings.
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blkt
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PostPosted: Sat Sep 05, 2020 3:38    Post subject: Reply with quote
Sorry, I can't be of much help because in the middle of an r44251 uptime test (1 week no errors, a miracle for EA8500).

When r44251 released I was about to flash r44253, then decided to go with public for a long-term test.

So many SVN changes for half and quarter rates, including timing and clock, I hesitate to try anything after August 27.

Microsoft and Apple rely on a combination of 802.11k/v/r. There is also an adaptive mode iOS clients can use on Cisco.

Can DD-WRT support a modern implementation of band steering or fast transition roaming to persuade client migration?
msoengineer
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PostPosted: Sat Sep 05, 2020 13:57    Post subject: Reply with quote
It would appear that 44251 or 44252 is the underlying issue as I roll back builds. Sitting on 44250 again and I'll watch it throughout the day.

I ran on 44253 for a while and ran into the same issue on non-moving clients...

so what did 44251 back port in bulk?
I'm not savvy enough in the track system to know where to look.

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blkt
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PostPosted: Sat Sep 05, 2020 14:24    Post subject: Reply with quote
You have experienced the issue on build r44251? This one is very smooth for me.

As for driver changelog notes, ask BrainSlayer about it. Smile
kernel-panic69
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PostPosted: Sat Sep 05, 2020 14:49    Post subject: Reply with quote
Only way to get to the behind the driver_changelog commit notes information is to sign an NDA. Those changes are (usually) not public AFAIK.
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msoengineer
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PostPosted: Tue Sep 08, 2020 15:15    Post subject: Reply with quote
44321 is yielding the same crap fallback Evil or Very Mad ...

Seems like the wifi drivers aren't yielding as powerful/consistent of a signal as the 44187-44236 builds.

I haven't found the exact build, yet, where wifi turns to shit like it does... but it seems like >44236 until I can test some more between 44236 and 44250/44251 (Those latter ones do start having issues with 5g to 2.4g fallback)

Can't experiment until kids are on lunch break for e-learning Rolling Eyes ...

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mrjcd
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PostPosted: Tue Sep 08, 2020 15:32    Post subject: Reply with quote
msoengineer wrote:
Seems like the wifi drivers aren't yielding as powerful/consistent of a signal

might have noticed just little bit of that but I'm thinking r44315 is back to all good Wink
msoengineer
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PostPosted: Tue Sep 08, 2020 16:48    Post subject: Reply with quote
I think I found the bastard Evil or Very Mad :
https://svn.dd-wrt.com/changeset/44214

CVE-2020-3702: Firmware updates for ath9k and ath10k chips:
https://www.mail-archive.com/ath10k@lists.infradead.org/msg12659.html

Waiting for lunch to go to 44213 and see what it yields...

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kernel-panic69
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PostPosted: Tue Sep 08, 2020 17:17    Post subject: Reply with quote
Patch against kr00k and adjust configurations accordingly or complain seems to be the "problem". Again, same SSID issues date back to long before either of us got here. Stock firmwares don't even use the same SSID. At some point you quit taking aim at your feet or temple.
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msoengineer
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PostPosted: Tue Sep 08, 2020 18:00    Post subject: Reply with quote
Back to my original point... things were working just fine with same ssid for me and how I had the network set up...

right now 44213 held signals fine- 35ish minutes w/o dropping over. (usually shows up in 10-13 minutes if it will)

switched to 44215 and it will have to run that way until 5pm...but at the moment 44215 is holding steady too... I'll report back, don't you worry...

but again...there is a bug somewhere that was introduced with the driver commits; just have to find where. I ran fine with the same SSID for nearly a year's worth of builds...so it wasn't dumb luck...something changed at the driver level with how ath10k handles signals, and/or the TX pwr with regards to stability in strength. Still reviewing the SVN's and driver commits.

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blkt
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PostPosted: Tue Sep 08, 2020 18:17    Post subject: Reply with quote
Maybe a future build will fix this? I saw a 9984 reference here. https://svn.dd-wrt.com/changeset/44321

EA8500 uses a different binary 99X0 and everything is super great r44251 up 11 days 6:40, zero rx/tx errors and dmesg is clean.
tatsuya46
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PostPosted: Tue Sep 08, 2020 23:42    Post subject: Reply with quote
try 2.4ghz 200-300 beacon interval, 5ghz 75 beacon interval. dtim on 4 with 75 beacon = dtim on 1 with 300 beacon on the other band (dont have to line up, but id prefer them to).

but it ultimately falls with the client, it's threshold for switching, and the type of scanning it does, passive or active..

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blkt
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PostPosted: Tue Sep 08, 2020 23:58    Post subject: Reply with quote
Bacon won't go under 100, Bobby. https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=322333

https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1204405#1204405
msoengineer
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PostPosted: Wed Sep 09, 2020 5:35    Post subject: Reply with quote
well, the mystery deepens...

44213 has been running, but is proving to be problematic too in that intel clients swapping to 2.4 from 5ghz... These are mostly stationary laptops that move around once in a great while, but otherwise serve as htpc's...

44188 runs great and does not exhibit this strange wifi dropping behavior...

there's very little that changes between 44188 and 44213 to warrant this drastic change...

44191 is a patch issued by the guys making the ath10k drivers for linux, but that's the only thing I can point to right now that's of any significance...

what sets this all off...the stupid LG washer and dryer that have their wifi disabled, but do have a "smart grid" feature I am unable to permanently disable....not sure if the 900-930 mhz is somehow traveling through the router via line of sight and blasting the wifi signal to shit somehow...or if the LG washer dryer units are doing something else really goofy....but it only happens when they are first turned on. They cause all intel 8260 cards to duplicate on both 2.4 and 5ghz for a few minutes and then drop off to 2.4ghz...

super frustrating....Evil or Very Mad

and before you start replies with the appliances, please don't go there...no I didn't want smart appliances...just happened to be an awesome sale at costco that we couldn't pass up to save on water usage doing laundry 3x/day...so piss off with any comments about that ahead of time...

I am looking for solutions and not rants about stuff... 44188 is rock solid...newer builds are not...this hasn't been an issue up until >44188...

I'm open to running any commands anyone is willing to offer as possible troubleshooting hints.

I may blow a call into LG too and escalate this...other ancillary reports can be found searching around about LG appliances taking down wifi and camera systems.

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