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FS#2831 - 2.4Ghz Wifi speed degradation on WNDR3800 #8044
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scottie125: Hello. Just found that out today as I was upgrading my WNDR3800 from 18.06.8 to 19.07.2. I have a 50mbit connection. When running 18.06.8 I get around 48mbit. When running 19.07.2 I get around 8-12mbit. This happens with a distance to the router of around 1 meter. No obstacles between. Indeed this is a bad regression. I also deleted all config files and tried to use a fresh install of 19.07.2. Didn't make any difference. Please devs, take a look into it. Thank you for your great work! |
arminfuerst: I have the same device, but cannot confirm a performance difference after upgrading to 19.07.x (ath79). But the WiFi never was as fast as my internet connection, devices being as close as 1 meter never got more than around 25MBit. |
scottie125: I see. So I tried again after reading your comment. First I flashed 19.07.2 (ath79) to the router (not 1CHNAS but v1 by the way). Did a reset to remove all config files. Connected via Lan cable: 50 MBit. Connected via 2.4G Wifi: around 8-12MBit again. No difference with channel, encryption, 20 or 40Mhz. Flashed 18.06.8 again. Resetted to removed all config files. Connected via LAN cable: 50MBit. Connected via 2.4G Wifi: around 46-48MBit. Distance to the router always around 1 meter. No walls or furniture in between. I wonder why your results differ from mine. You have the v1 model? Did you try 18.06.8? Also reset the config? Whats the Lan speed, what's the Wifi speed for 18.06.8? |
arminfuerst: To be honest, I'm not sure which version I have. On the "Overview" of OpenWRT, the architecture says "Atheros AR7161 rev 2". I also attach a photo, perhaps this shows the version? |
scottie125: I found some time now to do another test. Unfortunately still the same. This means OpenWRT version 18.06.8 works as fast as my provider is delivering. I get 48-50 MBit even through a wall and 5 meters away from the router. I have the same version, Atheros AR7161 rev 2. As for the radio, i use Atheros AR9223 802.11bgn. As parameters I have set encryption to WPA2 PSK (CCMP), Operating frequenzy is set to N, Channel Auto, Width 40, I do not allow legacy 802.11b rates and I have set Force 40MHz mode. No other modifications. If that doesnt work for you, I am out of ideas. Good luck. |
arminfuerst: @scot: Beside of "Do not allow legacy 802.11b rates", "Force 40MHz mode" and "WPA2 PSK (CCMP)", your settings are identical to mine. I tried setting these values - every on it's own and every combination - and the speed is always comparable. |
PlumWolf: Try AR71xx version. |
PlumWolf:
I found that on WNDR3800, ath79 build 2.4Ghz Wifi slower than ar71xx build.
ath79 build only get about 3.5MB/s (2.4Ghz 40Mhz), ar71xx build get about 10MB/s. (2.4Ghz 40Mhz)
Same network, Same wifi channel, test on speedtest.
I think this is a serious performance issue.
Device problem occurs on
WNDR3800(ath79) latest sources at master branch.
Steps to reproduce
install ar71xx build
test on speedtest.net (Samsung S6 and Sony xz1 use 2.4G wifi)
install ath79 build
test on speedtest.net (Samsung S6 and Sony xz1 use 2.4G wifi)
download speed only half of ar71xx build.
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