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Date:   Fri, 5 May 2023 11:23:19 +1000
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Subject: Re: Slow RTL8822CE 802.11ac PCIe Wireless Network Adapter
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>
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From:   Alexey Kardashevskiy <aik@amd.com>
In-Reply-To: <98f8852a-1710-2792-3196-e74fe614a03d@lwfinger.net>
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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:
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		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


-- 
Alexey