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Opened 3 years ago

Last modified 3 years ago

#18858 new defect

WDR3600 and possibly WDR4300 WiFi throughoutput issue and solution.

Reported by: inteliboy@… Owned by: developers
Priority: high Milestone: Barrier Breaker 14.07
Component: kernel Version: Barrier Breaker 14.07
Keywords: wdr3600, wdr4300, wifi, wthroughput, Cc:

Description

I have 2 pieces of TP-LINK WDR3600, one v1.4 and other v1.5. I used to use Attitude Adjustment prior to the revision 39408 https://dev.openwrt.org/changeset/39408/ that was supposedly improve WiFi.
Since then WiFi performance droped around 50%. All newer builds: barrier breaker and trunk ones have this patch implemented and for me all of them have WiFi throughoutput issues. I investigated and compiled both attitude adjustment and barier breaker in latest (as of 31.01.2015) revisions but without the change in the "mach-tl-wdr4300.c" file and the speeds are now again as they were previously to the r39408.
The RSSI also improves from -40db to -37db.
OpenWRT report lower quality of signgal but the noise level improves sagnificantly.
For the Barrier Breaker the changeset with patch is /changeset/39392.html

The issue was examined multiple times on various branches and revisions.
I provide a picture from speedtest.net and LuCi demonstratin the situation on BarrierBreaker. varioushttps://dl.dropboxusercontent.com/u/68691078/results.png

If this patch indeed improves WiFi in some WDR3600/WDR4300 version unlike in my case then I believe that an alternative binary without the patch should be provided to resolve the throughtoutput issue as there clearly is one.

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Change History (3)

comment:1 Changed 3 years ago by anonymous

Wifi performance is a mess since a few months, dont know what they changed, but they did something bad. Look here too: /ticket/17582.html

I am doing a "0 7 * * */sbin/wifi >/dev/null 2>&1" cron which helps a little bit. Im on a Netgear wndr3800 though.

comment:2 follow-up: Changed 3 years ago by anonymous

I can confirm that.

Original, with 39392 applied:

https://photos-3.dropbox.com/t/2/AACP7T6ruRPMZ58jPXiiSZkXEWZj0wEQwrxwIrIsxFSFxg/12/341310530/png/1024x768/3/1425207600/0/2/Screen%20Shot%202015-03-01%20at%2003.52.03.png/CML436IBIAEgAiADKAE/fCcFcI6AR_7zYY1ZIZ0r1Ks1dxNVvdLIP7kOxshi47M

Recompiled, with 39392 removed:

https://photos-6.dropbox.com/t/2/AADAhDvksG0VdnVLdz3tpv8r4GGKHXzMB1YOGIFNjnekmw/12/341310530/png/1024x768/3/1425207600/0/2/Screen%20Shot%202015-03-01%20at%2006.17.44.png/CML436IBIAEgAiADKAE/oLLaxw5NdUdVJYf5TAD1fQB6ZSQsdaVmSTyNC8_1nww

Signal and noise after patch removed (sorry, forgot to print screen before removing the patch):

https://photos-4.dropbox.com/t/2/AAASZGwSbTtDbkXKef7ZI0ShMrx4iF0csmrMb6uwS61MrQ/12/341310530/png/1024x768/3/1425207600/0/2/Screen%20Shot%202015-03-01%20at%2006.17.04.png/CML436IBIAEgAiADKAE/s_0zWGGZdrmDJCwj-HJodeRVldar_znY7WDRNB3Or6A

comment:3 in reply to: ↑ 2 Changed 3 years ago by Kamus Hadenes

Sorry, just forgot to add name

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