Slow Wifi Speed [RTW8821ce]

Muhiiii commented 1 year ago

I am running Dualboot and my wifi Speed in Linux is very slow compared to Windows. I dont know which information i could give currently, so if you need any information i will try to provide information

lwfinger commented 1 year ago

First, run the following command: sudo find /sys/kernel/debug/ieee80211 -name rtw88 Save the path of that file. Then when running a test through speedtest.net, run the following command:

sudo cat /file path from above/phy_info Post that info as well as the output of 'iw info'.

Muhiiii commented 1 year ago

Output of the Command: `==========[Common Info]======== Is link = Y Current CH(fc) = 42 Current BW = 2 Current IGI = 0x2f TP {Tx, Rx} = {0, 13}Mbps 1SS for TX and RX = N

==========[Tx Phy Info]======== [Tx Rate] = VHT1SMCS3(0x2f)

==========[Rx Phy Info]======== [Rx Beacon Count] = 19 [Rx Rate] = VHT1SMCS7(0x33) [Rx Rate Count]:

CCK = {0, 0, 0, 0}
OFDM = {19, 0, 0, 0, 0, 0, 0, 0}
HT_MCS[0:7] = {0, 0, 0, 0, 0, 0, 0, 0}
VHT_MCS-1ss MCS[0:9] = {0, 0, 0, 0, 0, 0, 0, 11, 438, 14} [RSSI(dBm)] = {-57, -100} [Rx EVM(dB)] = {-0, -0} [Rx SNR] = {0, 0} [CFO_tail(KHz)] = {0, 0} [Rx Average Status]:
OFDM, EVM: {-0}, SNR: {0}
1SS, EVM: {-0}, SNR: {0}
2SS, EVM: {-0, -0}, SNR: {0, 0} [Rx Counter]:
CCA (CCK, OFDM, Total) = (0, 10499, 10499)
False Alarm (CCK, OFDM, Total) = (0, 1917, 1917)
CCK cnt (ok, err) = (0, 0)
OFDM cnt (ok, err) = (7684, 24)
HT cnt (ok, err) = (0, 0)
VHT cnt (ok, err) = (4245, 561) iw dev interface info Output : Interface wlo1 ifindex 3 wdev 0x1 addr dc:a2:66:7c:68:8b ssid Muhi type managed wiphy 0 channel 36 (5180 MHz), width: 80 MHz, center1: 5210 MHz txpower 20.00 dBm multicast TXQ: qsz-byt qsz-pkt flows drops marks overlmt hashcol tx-bytes tx-packets 0 0 0 0 0 0 0 0 0 ` Settings i have done:
- Used the given Suspend script
- blacklisted the rtw88 modules
- Added rtw_pci Options:
disable_aspm=1
disable_msi=1

lwfinger commented 1 year ago

Please repeat the 'sudo cat' command while you are transmitting to speedtest.net. This test showed the bulk of the RX operations were done ar VHT1MCS8, which should be about 170 Mbps. The transmit was at VHT1MCS3, so I thing that was only sending acks. What are the values that speedtest.net shows? What do you get from Windows?

Are you aware that you only have 1 antenna connected?

Muhiiii commented 1 year ago

Output during Upload: `==========[Common Info]======== Is link = Y Current CH(fc) = 42 Current BW = 2 Current IGI = 0x3b TP {Tx, Rx} = {1, 1}Mbps 1SS for TX and RX = N

==========[Tx Phy Info]======== [Tx Rate] = VHT1SMCS3(0x2f)

==========[Rx Phy Info]======== [Rx Beacon Count] = 19 [Rx Rate] = VHT1SMCS9(0x35) [Rx Rate Count]:

CCK = {0, 0, 0, 0}
OFDM = {19, 0, 0, 0, 0, 0, 0, 0}
HT_MCS[0:7] = {0, 0, 0, 0, 0, 0, 0, 0}
VHT_MCS-1ss MCS[0:9] = {0, 0, 0, 0, 0, 0, 0, 0, 18, 116} [RSSI(dBm)] = {-48, -100} [Rx EVM(dB)] = {-0, -0} [Rx SNR] = {0, 0} [CFO_tail(KHz)] = {0, 0} [Rx Average Status]:
OFDM, EVM: {-0}, SNR: {0}
1SS, EVM: {-0}, SNR: {0}
2SS, EVM: {-0, -0}, SNR: {0, 0} [Rx Counter]:
CCA (CCK, OFDM, Total) = (0, 4673, 4673)
False Alarm (CCK, OFDM, Total) = (0, 621, 621)
CCK cnt (ok, err) = (0, 0)
OFDM cnt (ok, err) = (3023, 3)
HT cnt (ok, err) = (0, 0)
VHT cnt (ok, err) = (135, 25) During Download ==========[Common Info]======== Is link = Y Current CH(fc) = 42 Current BW = 2 Current IGI = 0x3b TP {Tx, Rx} = {1, 2}Mbps 1SS for TX and RX = N

==========[Tx Phy Info]======== [Tx Rate] = VHT1SMCS3(0x2f)

==========[Rx Phy Info]======== [Rx Beacon Count] = 20 [Rx Rate] = VHT1SMCS9(0x35) [Rx Rate Count]:

CCK = {0, 0, 0, 0}
OFDM = {20, 0, 0, 0, 0, 0, 0, 0}
HT_MCS[0:7] = {0, 0, 0, 0, 0, 0, 0, 0}
VHT_MCS-1ss MCS[0:9] = {0, 0, 0, 0, 0, 0, 0, 0, 13, 119} [RSSI(dBm)] = {-49, -100} [Rx EVM(dB)] = {-0, -0} [Rx SNR] = {0, 0} [CFO_tail(KHz)] = {0, 0} [Rx Average Status]:
OFDM, EVM: {-0}, SNR: {0}
1SS, EVM: {-0}, SNR: {0}
2SS, EVM: {-0, -0}, SNR: {0, 0} [Rx Counter]:
CCA (CCK, OFDM, Total) = (0, 6185, 6185)
False Alarm (CCK, OFDM, Total) = (0, 917, 917)
CCK cnt (ok, err) = (0, 0)
OFDM cnt (ok, err) = (3738, 3)
HT cnt (ok, err) = (0, 0)
VHT cnt (ok, err) = (126, 23) `
- On windows im getting around 100Mb download and 20Mb Upload
- On Linux im getting around 15Mb download and 2Mb Upload

No i was not aware of the fact that i am only using one antenna. I am using a Laptop so i did not think of that kind of things

lwfinger commented 1 year ago

Send me the output of 'iw list' as well. When I connect my 8852be, a wifi 6 device, to my wifi 5 router, it drives the lines at the full speed of my 500 Mbps broadband connection. The TX and RX speeds are VHT2SSMC9.

Muhiiii commented 1 year ago

Wiphy phy0 wiphy index: 0 max # scan SSIDs: 4 max scan IEs length: 2243 bytes max # sched scan SSIDs: 0 max # match sets: 0 Retry short limit: 7 Retry long limit: 4 Coverage class: 0 (up to 0m) Device supports T-DLS. Supported Ciphers:

WEP40 (00-0f-ac:1)
WEP104 (00-0f-ac:5)
TKIP (00-0f-ac:2)
CCMP-128 (00-0f-ac:4)
CCMP-256 (00-0f-ac:10)
GCMP-128 (00-0f-ac:8)
GCMP-256 (00-0f-ac:9)
CMAC (00-0f-ac:6)
CMAC-256 (00-0f-ac:13)
GMAC-128 (00-0f-ac:11)
GMAC-256 (00-0f-ac:12) Available Antennas: TX 0x1 RX 0x1 Configured Antennas: TX 0x1 RX 0x1 Supported interface modes:
- IBSS
- managed
- AP
- AP/VLAN
- monitor
- mesh point Band 1: Capabilities: 0x196e HT20/HT40 SM Power Save disabled RX HT20 SGI RX HT40 SGI RX STBC 1-stream Max AMSDU length: 7935 bytes DSSS/CCK HT40 Maximum RX AMPDU length 65535 bytes (exponent: 0x003) Minimum RX AMPDU time spacing: 2 usec (0x04) HT Max RX data rate: 150 Mbps HT TX/RX MCS rate indexes supported: 0-7, 32 Bitrates (non-HT):
  - 1.0 Mbps
  - 2.0 Mbps
  - 5.5 Mbps
  - 11.0 Mbps
  - 6.0 Mbps
  - 9.0 Mbps
  - 12.0 Mbps
  - 18.0 Mbps
  - 24.0 Mbps
  - 36.0 Mbps
  - 48.0 Mbps
  - 54.0 Mbps Frequencies:
  - 2412 MHz [1] (20.0 dBm)
  - 2417 MHz [2] (20.0 dBm)
  - 2422 MHz [3] (20.0 dBm)
  - 2427 MHz [4] (20.0 dBm)
  - 2432 MHz [5] (20.0 dBm)
  - 2437 MHz [6] (20.0 dBm)
  - 2442 MHz [7] (20.0 dBm)
  - 2447 MHz [8] (20.0 dBm)
  - 2452 MHz [9] (20.0 dBm)
  - 2457 MHz [10] (20.0 dBm)
  - 2462 MHz [11] (20.0 dBm)
  - 2467 MHz [12] (20.0 dBm)
  - 2472 MHz [13] (20.0 dBm)
  - 2484 MHz [14] (disabled) Band 2: Capabilities: 0x196e HT20/HT40 SM Power Save disabled RX HT20 SGI RX HT40 SGI RX STBC 1-stream Max AMSDU length: 7935 bytes DSSS/CCK HT40 Maximum RX AMPDU length 65535 bytes (exponent: 0x003) Minimum RX AMPDU time spacing: 2 usec (0x04) HT Max RX data rate: 150 Mbps HT TX/RX MCS rate indexes supported: 0-7, 32 VHT Capabilities (0x03d07122): Max MPDU length: 11454 Supported Channel Width: neither 160 nor 80+80 short GI (80 MHz) SU Beamformee MU Beamformee +HTC-VHT VHT RX MCS set: 1 streams: MCS 0-9 2 streams: not supported 3 streams: not supported 4 streams: not supported 5 streams: not supported 6 streams: not supported 7 streams: not supported 8 streams: not supported VHT RX highest supported: 390 Mbps VHT TX MCS set: 1 streams: MCS 0-9 2 streams: not supported 3 streams: not supported 4 streams: not supported 5 streams: not supported 6 streams: not supported 7 streams: not supported 8 streams: not supported VHT TX highest supported: 390 Mbps VHT extended NSS: not supported Bitrates (non-HT):
  - 6.0 Mbps
  - 9.0 Mbps
  - 12.0 Mbps
  - 18.0 Mbps
  - 24.0 Mbps
  - 36.0 Mbps
  - 48.0 Mbps
  - 54.0 Mbps Frequencies:
  - 5180 MHz [36] (23.0 dBm)
  - 5200 MHz [40] (23.0 dBm)
  - 5220 MHz [44] (23.0 dBm)
  - 5240 MHz [48] (23.0 dBm)
  - 5260 MHz [52] (20.0 dBm) (radar detection)
  - 5280 MHz [56] (20.0 dBm) (radar detection)
  - 5300 MHz [60] (20.0 dBm) (radar detection)
  - 5320 MHz [64] (20.0 dBm) (radar detection)
  - 5500 MHz [100] (26.0 dBm) (radar detection)
  - 5520 MHz [104] (26.0 dBm) (radar detection)
  - 5540 MHz [108] (26.0 dBm) (radar detection)
  - 5560 MHz [112] (26.0 dBm) (radar detection)
  - 5580 MHz [116] (26.0 dBm) (radar detection)
  - 5600 MHz [120] (26.0 dBm) (radar detection)
  - 5620 MHz [124] (26.0 dBm) (radar detection)
  - 5640 MHz [128] (26.0 dBm) (radar detection)
  - 5660 MHz [132] (26.0 dBm) (radar detection)
  - 5680 MHz [136] (26.0 dBm) (radar detection)
  - 5700 MHz [140] (26.0 dBm) (radar detection)
  - 5720 MHz [144] (13.0 dBm) (radar detection)
  - 5745 MHz [149] (13.0 dBm)
  - 5765 MHz [153] (13.0 dBm)
  - 5785 MHz [157] (13.0 dBm)
  - 5805 MHz [161] (13.0 dBm)
  - 5825 MHz [165] (13.0 dBm) Supported commands:
- new_interface
- set_interface
- new_key
- start_ap
- new_station
- new_mpath
- set_mesh_config
- set_bss
- authenticate
- associate
- deauthenticate
- disassociate
- join_ibss
- join_mesh
- remain_on_channel
- set_tx_bitrate_mask
- frame
- frame_wait_cancel
- set_wiphy_netns
- set_channel
- tdls_mgmt
- tdls_oper
- probe_client
- set_noack_map
- register_beacons
- start_p2p_device
- set_mcast_rate
- connect
- disconnect
- set_qos_map
- set_multicast_to_unicast
- set_sar_specs software interface modes (can always be added):
- AP/VLAN
- monitor interface combinations are not supported HT Capability overrides:
- MCS: ff ff ff ff ff ff ff ff ff ff
- maximum A-MSDU length
- supported channel width
- short GI for 40 MHz
- max A-MPDU length exponent
- min MPDU start spacing Device supports TX status socket option. Device supports HT-IBSS. Device supports SAE with AUTHENTICATE command Device supports scan flush. Device supports per-vif TX power setting Driver supports full state transitions for AP/GO clients Driver supports a userspace MPM Device supports configuring vdev MAC-addr on create. Device supports randomizing MAC-addr in scans. max # scan plans: 1 max scan plan interval: -1 max scan plan iterations: 0 Supported TX frame types:
- IBSS: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
- managed: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
- AP: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
- AP/VLAN: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
- mesh point: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
- P2P-client: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
- P2P-GO: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
- P2P-device: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0 Supported RX frame types:
- IBSS: 0x40 0xb0 0xc0 0xd0
- managed: 0x40 0xb0 0xd0
- AP: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
- AP/VLAN: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
- mesh point: 0xb0 0xc0 0xd0
- P2P-client: 0x40 0xd0
- P2P-GO: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
- P2P-device: 0x40 0xd0 Supported extended features:
[ SET_SCAN_DWELL ]: scan dwell setting
[ FILS_STA ]: STA FILS (Fast Initial Link Setup)
[ CONTROL_PORT_OVER_NL80211 ]: control port over nl80211
[ TXQS ]: FQ-CoDel-enabled intermediate TXQs
[ SCAN_RANDOM_SN ]: use random sequence numbers in scans
[ CAN_REPLACE_PTK0 ]: can safely replace PTK 0 when rekeying
[ CONTROL_PORT_NO_PREAUTH ]: disable pre-auth over nl80211 control port support
[ DEL_IBSS_STA ]: deletion of IBSS station support
[ SCAN_FREQ_KHZ ]: scan on kHz frequency support
[ CONTROL_PORT_OVER_NL80211_TX_STATUS ]: tx status for nl80211 control port support

lwfinger commented 1 year ago

I do not have a fix yet, but I have found a symptom.

I installed an 8821CE chip in my computer and tested the 5 GHz band to my various routers. The results are as follows:

Router level Rx Speed Tx Speed Wifi 4 108 Mbps 87 Wifi 5 15 1.4 Wifi 6 36 37

For some reason, the 802.11ac chip performs worst when connected to an 802.11ac AP! It seems that the driver is not handling the VHT speeds properly. If you have access to a Wifi 4 router, then you can improve your performance. In the meantime, I will be reporting this to Realtek. I will let you know when I have an update.

Muhiiii commented 1 year ago

Thanks for reaching out to Realtelk. How do you know that i am only using one Antenna?

lwfinger commented 1 year ago

I am not sure that you are. In your phy_info, there were the lines: VHT_MCS-1ss MCS[0:9] = {0, 0, 0, 0, 0, 0, 0, 0, 18, 116} [RSSI(dBm)] = {-48, -100}

For rtw89, these list the RSSI for the two antennas, but I get the same for my card, even though I have 2 antennas connected. Obviously, the results do not mean the same for rtw88.

I have installed an RTL8821CE in my laptop, and I am doing some testing. At the moment, the results are confusing as sometimes I get the poor performance you describe, and other times I get what would be expected, but I have no clue on what the difference is.

lwfinger commented 1 year ago

I am making some progress. I booted openSUSE Leap 15.4 and Leap 15.5, both of which use a 5.14.21 kernel. I have not been able to get either to fail using the rtw88 driver built into the kernel. Under Leap 15.4 and using a 5GHz connection, I get the following:

Wifi 6 365/262 Mbs Rx/Tx Wifi 5 156/119 Mbps Wifi 4 119/107 Mbps

I expected there to be a bigger difference between Wifi 4 and Wifi 5, but that is a smaller problem.

What kernel are you using? The command 'uname -r' will give that info.

Muhiiii commented 1 year ago

6.1.13-1-lts

lwfinger commented 1 year ago

It appears that we have a regression before kernel 6.1.X. I will try to bisect it.

Thanks for the info.

Muhiiii commented 1 year ago

Already thanks in advance.

lwfinger commented 1 year ago

I found the problem. It was a merge error in my copying of the kernel code to this repo. You should be able to do a new pull and get code that works properly.

Muhiiii commented 1 year ago

IT WORKS!!!!!!!

lwfinger / rtw88

Slow Wifi Speed [RTW8821ce] #119