Messages in this thread | | | Subject | Re: RTL8723BE performance regression | From | Larry Finger <> | Date | Tue, 3 Apr 2018 21:51:18 -0500 |
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On 04/03/2018 09:37 PM, João Paulo Rechi Vita wrote: > On Tue, Apr 3, 2018 at 7:28 PM, Larry Finger <Larry.Finger@lwfinger.net> wrote: > > (...) > >> As the antenna selection code changes affected your first bisection, do you >> have one of those HP laptops with only one antenna and the incorrect coding >> in the FUSE? > > Yes, that is why I've been passing ant_sel=1 during my tests -- this > was needed to achieve a good performance in the past, before this > regression. I've also opened the laptop chassis and confirmed the > antenna cable is plugged to the connector labeled with "1" on the > card. > >> If so, please make sure that you still have the same signal >> strength for good and bad cases. I have tried to keep the driver and the >> btcoex code in sync, but there may be some combinations of antenna >> configuration and FUSE contents that cause the code to fail. >> > > What is the recommended way to monitor the signal strength?
The btcoex code is developed for multiple platforms by a different group than the Linux driver. I think they made a change that caused ant_sel to switch from 1 to 2. At least numerous comments at github.com/lwfinger/rtlwifi_new claimed they needed to make that change.
Mhy recommended method is to verify the wifi device name with "iw dev". Then using that device
sudo iw dev <dev_name> scan | egrep "SSID|signal"
Larry
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