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Date:   Wed, 24 May 2023 16:29:12 +1000
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Subject: Re: Slow RTL8822CE 802.11ac PCIe Wireless Network Adapter
Content-Language: en-US
To:     Larry Finger <Larry.Finger@lwfinger.net>,
        Yan-Hsuan Chuang <tony0620emma@gmail.com>
Cc:     linux-wireless@vger.kernel.org
References: <75906666-df37-988a-c448-a6338b8a1cff@amd.com>
 <b7a59145-37b0-eade-3a9e-b565cc75de35@lwfinger.net>
 <4b3f4c5b-cada-bb7c-65f3-936437261b08@amd.com>
 <98f8852a-1710-2792-3196-e74fe614a03d@lwfinger.net>
 <eed0261b-6447-fe8a-ef98-073ae45ff137@amd.com>
 <b5f379e5-1917-d83b-ab3b-b651444d8f67@lwfinger.net>
From:   Alexey Kardashevskiy <aik@amd.com>
In-Reply-To: <b5f379e5-1917-d83b-ab3b-b651444d8f67@lwfinger.net>
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On 5/5/23 11:35, Larry Finger wrote:
> On 5/4/23 20:23, Alexey Kardashevskiy wrote:
>>
>>
>> On 5/5/23 01:04, Larry Finger wrote:
>>> On 5/3/23 22:10, Alexey Kardashevskiy wrote:
>>>> My bad, I should have mentioned that I tried this one as well, 
>>>> https://github.com/lwfinger/rtw88/commit/75e2c81 3weeks old, no 
>>>> difference there.
>>>>
>>>> And it does not look like there was any change related to my problem 
>>>> since then, is it still worth trying the very latest version? Btw 
>>>> reboot is not really required, it is Linux, not Windows, 
>>>> rmmod+modprobe should do ???? Thanks,
>>>
>>> I added a bunch of stuff on April 24-25, so a 3-week old pull would 
>>> have missed some important stuff.
>>>
>>> The problem with rmmod+modprobe is that the rtw88_core module is not 
>>> removed, certainly not with a 'sudo modprobe -rv rtw88_8822ce, and it 
>>> is really easy to get a mixed bunch. I get tired of explaining that 
>>> to a bunch of newbies, thus I recommend a reboot. Of course, I do not 
>>> reboot.
>>
>> Turns out I had to reboot because of the module signature :-/
>>
>> Anyway it does not appear to work any better. Below are bad ping and 
>> good ping, the difference is moving laptop 2cm to the left. I believe 
>> the right driver is loaded as the modules are "rtw_" and not "rtw88_". 
>> It is quite bizarre how moving the laptop for a little bit helps and 
>> moving it back does not necessarily put it in the bad state, may be 
>> there is a microcrack in some PCB or something :-/
>>
>>
>> aik@aiemdeew ~> ping -c3 192.168.10.200 ; iw wlp1s0 link | grep signal
>> PING 192.168.10.200 (192.168.10.200) 56(84) bytes of data.
>> 64 bytes from 192.168.10.200: icmp_seq=1 ttl=64 time=7707 ms
>> 64 bytes from 192.168.10.200: icmp_seq=2 ttl=64 time=6677 ms
>> 64 bytes from 192.168.10.200: icmp_seq=3 ttl=64 time=5653 ms
>>
>> --- 192.168.10.200 ping statistics ---
>> 3 packets transmitted, 3 received, 0% packet loss, time 2054ms
>> rtt min/avg/max/mdev = 5653.382/6679.203/7706.911/838.350 ms, pipe 3
>>      signal: -56 dBm
>> aik@aiemdeew ~> ping -c3 192.168.10.200 ; iw wlp1s0 link | grep signal
>> PING 192.168.10.200 (192.168.10.200) 56(84) bytes of data.
>> 64 bytes from 192.168.10.200: icmp_seq=1 ttl=64 time=3.35 ms
>> 64 bytes from 192.168.10.200: icmp_seq=2 ttl=64 time=3.48 ms
>> 64 bytes from 192.168.10.200: icmp_seq=3 ttl=64 time=3.84 ms
>>
>> --- 192.168.10.200 ping statistics ---
>> 3 packets transmitted, 3 received, 0% packet loss, time 2003ms
>> rtt min/avg/max/mdev = 3.347/3.553/3.837/0.207 ms
>>      signal: -55 dBm
>>
>>
>> aik@aiemdeew ~> modinfo rtw_8822ce
>> filename: 
>> /lib/modules/6.2.9-100.fc36.x86_64/kernel/drivers/net/wireless/realtek/rtw88/rtw_8822ce.ko.xz
>> license:        Dual BSD/GPL
>> description:    Realtek 802.11ac wireless 8822ce driver
>> author:         Realtek Corporation
>> alias:          pci:v000010ECd0000C82Fsv*sd*bc*sc*i*
>> alias:          pci:v000010ECd0000C822sv*sd*bc*sc*i*
>> depends:        rtw_pci,rtw_8822c
>> retpoline:      Y
>> name:           rtw_8822ce
>> vermagic:       6.2.9-100.fc36.x86_64 SMP preempt mod_unload
>> sig_id:         PKCS#7
>> signer:         Custom MOK
>> sig_key:        
>> 0C:F6:31:12:B9:95:09:20:A6:62:E6:72:4F:D1:85:00:F4:A6:A9:B6
>> sig_hashalgo:   sha256
>> signature:      
>> 9F:F1:74:86:E8:B6:63:FA:F5:EC:2C:84:02:75:63:DC:66:C8:99:92:
>>          9D:A8:1E:2F:FB:5F:50:EE:DD:59:A5:EC:DE:5F:AB:8A:4C:F9:D3:8A:
>>          CC:CE:BE:3B:55:C8:E9:D9:AF:12:D0:A4:DE:B7:FB:A4:44:B2:F0:96:
>>          CD:E2:C0:69:0C:A8:EB:1C:9C:BF:A8:91:3E:D2:7F:AD:9B:7D:22:A4:
>>          3F:33:8F:86:40:DD:B3:42:B9:96:5B:94:CD:0B:E3:38:A0:8E:4E:8C:
>>          62:38:11:01:D6:16:EC:B6:E2:28:48:07:A0:C4:6C:6C:55:04:01:F6:
>>          C6:82:7E:F9:DE:EA:D0:20:63:41:4F:0A:D8:27:56:49:F6:84:E2:B9:
>>          21:DF:3E:4B:C2:A7:C6:0A:8C:B7:66:17:E5:81:13:D6:5E:CA:94:D1:
>>          E7:60:EF:B1:9D:52:E0:64:F8:4D:C5:54:CE:EF:F5:DC:2F:AA:22:5C:
>>          81:52:CE:AF:9B:FA:9B:8B:88:99:2F:2C:8E:6A:A3:44:58:3B:6B:08:
>>          78:43:B1:E9:27:C9:43:E6:49:BB:86:0E:23:10:0E:05:33:0C:23:B0:
>>          5E:47:92:EE:0B:96:EA:65:92:89:69:DC:73:50:1D:A5:96:5A:11:32:
>>          C6:2A:69:7A:B6:FE:6A:22:7F:69:61:B1:9B:F1:CF:66
>> aik@aiemdeew ~> lsmod | grep rtw
>> rtw_8822ce             16384  0
>> rtw_8822c             499712  1 rtw_8822ce
>> rtw_pci                40960  1 rtw_8822ce
>> rtw_core              319488  2 rtw_8822c,rtw_pci
>> mac80211             1486848  2 rtw_core,rtw_pci
>> cfg80211             1273856  2 rtw_core,mac80211
> 
> You do have the right modules. It would take a really strange 
> environment where moving the computer 2 cm would have a drastic effect.
> 
> I think I have gone as far as I can.


This turned out to be an hdmi cable via an usb-c->hdmi adapter, the 
cable seemed decent as it can do hdmi2.0/4K/60Hz. I was starting ping, 
making it stop by moving a laptop and then unpluging the adapter and 
ping would resume the same instance. Bizarre. I replaced with another 
dongle and cable, this time usb-c->displayport and things are great. 
Sorry for the noise.


-- 
Alexey