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【Linux】
[ROC-RK3568-PC][Wifi] Bandwith limited to 20MHz
Posted at 2/5/2022 01:06:16
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Replies：8
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I have the following issue with the wifi module AP6275S: I am trying to run an access point in wifi ac mode but I when running iperf I saw the throughput is always around 125mbps. When running iw list I saw that in the capabilities only 20MHz bandwith is supported, which I think it may explain the issue:
iw list
Wiphy phy0
wiphy index: 0
max # scan SSIDs: 10
max scan IEs length: 2048 bytes
max # sched scan SSIDs: 0
max # match sets: 0
max # scan plans: 1
max scan plan interval: -1
max scan plan iterations: 0
Retry short limit: 7
Retry long limit: 4
Coverage class: 0 (up to 0m)
Device supports roaming.
Device supports T-DLS.
Available Antennas: TX 0 RX 0
Supported interface modes:
* IBSS
* managed
* AP
* P2P-client
* P2P-GO
* P2P-device
Band 1:
Capabilities: 0x1020
HT20
Static SM Power Save
RX HT20 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 16 usec (0x07)
HT RX MCS rate indexes supported: 0-7
HT TX MCS rate indexes are undefined
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)
Band 2:
Capabilities: 0x1020
HT20
Static SM Power Save
RX HT20 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 16 usec (0x07)
HT RX MCS rate indexes supported: 0-7
HT TX MCS rate indexes are undefined
VHT Capabilities (0x0f815832):
Max MPDU length: 11454
Supported Channel Width: neither 160 nor 80+80
RX LDPC
short GI (80 MHz)
SU Beamformer
SU Beamformee
VHT RX MCS set:
1 streams: MCS 0-9
2 streams: MCS 0-9
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: 0 Mbps
VHT TX MCS set:
1 streams: MCS 0-9
2 streams: MCS 0-9
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: 0 Mbps
Frequencies:
* 5180 MHz [36] (0.0 dBm)
* 5200 MHz [40] (0.0 dBm)
* 5220 MHz [44] (0.0 dBm)
* 5240 MHz [48] (0.0 dBm)
* 5260 MHz [52] (0.0 dBm)
* 5280 MHz [56] (0.0 dBm)
* 5300 MHz [60] (0.0 dBm)
* 5320 MHz [64] (0.0 dBm)
* 5745 MHz [149] (0.0 dBm)
* 5765 MHz [153] (0.0 dBm)
* 5785 MHz [157] (0.0 dBm)
* 5805 MHz [161] (0.0 dBm)
* 5825 MHz [165] (0.0 dBm)
valid interface combinations:
* #{ AP } <= 2, #{ managed } <= 4, #{ P2P-client, P2P-GO } <= 2, #{ P2P-device } <= 1, #{
IBSS } <= 1,
total <= 5, #channels <= 2
Supported extended features:
* [ LOW_SPAN_SCAN ]: low span scan
* [ LOW_POWER_SCAN ]: low power scan
* [ HIGH_ACCURACY_SCAN ]: high accuracy scan
Is this expected? I would expect to see at least HT20/HT40. Of course I set hw_mode=1 in hostapd but had no success.
I saw the following kernel messages during boot:
[ 17.291957] [dhd] dhd_conf_set_path_params : Final fw_path=/vendor/etc/firmware/fw_bcm43752a2_ag.bin
[ 17.292008] [dhd] dhd_conf_set_path_params : Final clm_path=/vendor/etc/firmware/clm_bcm43752a2_ag.blob
[ 17.293991] dhd_os_open_image1: /vendor/etc/firmware/fw_bcm43752a2_ag.bin (743607 bytes) open success
[ 17.490209] dhd_os_open_image1: /vendor/etc/firmware/clm_bcm43752a2_ag.blob (28865 bytes) open success
Is the bandwith limited because of loading this firmware? Should I update my kernel to a one containing this patch https://patchwork.kernel.org/pro ... 9-2-angus@akkea.ca/ to be able to increase wifi's throughput?
Thanks in advance.
Valentin |
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