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From: Larry Finger <Larry.Finger@lwfinger.net>
To: "João Paulo Rechi Vita" <jprvita@gmail.com>
Cc: "Yan-Hsuan Chuang" <yhchuang@realtek.com>,
	"Ping-Ke Shih" <pkshih@realtek.com>,
	"Birming Chiu" <birming@realtek.com>, Shaofu <shaofu@realtek.com>,
	"Steven Ting" <steventing@realtek.com>,
	"Chaoming Li" <chaoming_li@realsil.com.cn>,
	"Kalle Valo" <kvalo@codeaurora.org>,
	linux-wireless <linux-wireless@vger.kernel.org>,
	"Network Development" <netdev@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"Daniel Drake" <drake@endlessm.com>,
	"João Paulo Rechi Vita" <jprvita@endlessm.com>,
	linux@endlessm.com
Subject: Re: RTL8723BE performance regression
Date: Tue, 3 Apr 2018 21:51:18 -0500	[thread overview]
Message-ID: <059b40f0-b8e2-b55f-92d5-a859ba4204a4@lwfinger.net> (raw)
In-Reply-To: <CA+A7VXWjWaSSUiX3h_rpFXrSwtUkynKR9tpvnsSe=DZrC+mF-Q@mail.gmail.com>

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

  reply	other threads:[~2018-04-04  2:51 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-04  1:51 João Paulo Rechi Vita
2018-04-04  2:28 ` Larry Finger
2018-04-04  2:37   ` João Paulo Rechi Vita
2018-04-04  2:51     ` Larry Finger [this message]
2018-05-01 22:41       ` João Paulo Rechi Vita
2018-05-01 22:46         ` [RFC PATCH 1/3] rtlwifi: btcoex: Don't init antenna position to main port João Paulo Rechi Vita
2018-05-01 22:46           ` [RFC PATCH 2/3] Revert "rtlwifi: fill FW version and subversion" João Paulo Rechi Vita
2018-05-01 22:46           ` [RFC PATCH 3/3] rtlwifi: btcoex: Always use 2ant-functions for RTL8723BE João Paulo Rechi Vita
2018-05-02  5:44         ` RTL8723BE performance regression Pkshih
2018-05-02  5:58           ` Pkshih
2018-05-07 21:49             ` João Paulo Rechi Vita
2018-05-08  8:37               ` Pkshih
2018-05-09 20:33                 ` João Paulo Rechi Vita
2018-05-14  2:50                   ` Pkshih
2018-04-04 14:54 ` Steve deRosier

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