| joerg | that's most likely related to wifi power saving mode and AP support | 02:25 |
|---|---|---|
| L29Ah | joerg: tl-mr3020 running openwrt here | 05:15 |
| L29Ah | will try switching to mir3g running openwrt | 05:18 |
| L29Ah | er, s/mir3g/RB962UiGS-5HacT2HnT/ | 05:19 |
| L29Ah | no luck | 05:22 |
| L29Ah | n900 seems to start suffering bad packet delays and loss after a few seconds after it stops initiating any traffic, according to pings, and if i don't ping it, it just gets dropped from the network (apparently w/o noticing it) | 05:27 |
| joerg | L29Ah: check wifi power savings mode on N900 | 10:47 |
| joerg | I seen exactly this problem, with combinations of AP type, AP config and N900 WiFi power saving mode that didn't harmonize | 10:50 |
| joerg | in internet connections 4edit connection next next next (last screen) "extended" right tab "other" see "power savings mode:" "with some APs you need to reduce from "max" to "medium" or "none" | 10:54 |
| joerg | on AP check the timing and related settings of the wake-up beakons | 10:56 |
| joerg | beacons. I forgot the exact name, maybe somebody else recalls | 10:56 |
| sixwheeledbeast | did someone say bacon. oh, :( | 10:57 |
| sixwheeledbeast | :P | 10:57 |
| joerg | L29Ah: ralted -> https://www.hitchhikersguidetolearning.com/2017/09/17/legacy-power-save-in-wlan/ | 11:00 |
| joerg | related even | 11:01 |
| joerg | DTIM beacon | 11:02 |
| joerg | >>The TIM element indicates to the WLAN station whether data is buffered in the Access Point and the TIM information field is explained in the next article.<< | 11:04 |
| joerg | look into all this, this is the root cause of the issue | 11:04 |
| joerg | https://www.hitchhikersguidetolearning.com/2017/09/17/traffic-indication-map-explained/ | 11:16 |
| joerg | it *seems* the WL1253(?) in N900 has an incomplete or buggy implementation of DTIM and related stuff, or a jittery timer or whatever. I had best results with setting AP to "skip beacons: 0"/"DTIM with each N'th beacon: 1" and "DTIM period in seconds: 1" | 11:21 |
| joerg | YMMV | 11:21 |
| joerg | my N900 WLAN power savings mode set to "medium" did it then | 11:23 |
| * joerg hands sixwheeledbeast a bacon sandwich | 11:31 | |
| * joerg wouldn't be surprised either if this issue was a off-by-one problem of sorts, sth like "number of beacons to skip between 2 DTIM beacons: 0" and WL1253 reads/interprets that as MAXINT and waits 65535 beacons before waking up again. Sth is fishy in there with some APs and/or the N900 | 11:37 | |
| joerg | and yeah, obviously when you initiate OUTbound traffic on the N900, this deadlock whatever it is gets escaped | 11:40 |
| joerg | anyway at times my N900 sat there with me not noticing the charger wallwart been accidentally unplugged, and it was on instant response of the 24/7 established ssh connection from my PC to N900, for a week at times | 11:42 |
| joerg | worst case there been a 1s delay on very first cmdline sent after hours of idling | 11:43 |
| joerg | heartbreaking: (ancient TMO thread about clueless users abused by a poor AP) https://talk.maemo.org/showthread.php?t=59536&page=5 | 12:46 |
| L29Ah | joerg: lowered DTIM interval on the AP from 2 to 1, seems good now, thank you | 20:09 |
| joerg | very welcome :-) | 20:25 |
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