USB-WiFi
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Published
20 hours ago •
morrownr
morrownr
COMFAST CF-952AX v2: available, Realtek based, works with 8852bu.ko
I have ordered a COMFAST CF-953AX card, but the seller shipped the wrong item: COMFAST CF-952AX v2. I am going to return it in the next hour (EDIT: already returned). Before I do so, here is some information.
lsusb:
Bus 003 Device 060: ID 3574:6121 Realtek 802.11ac WLAN Adapter
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 [unknown]
bDeviceSubClass 0 [unknown]
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x3574 Realtek
idProduct 0x6121 802.11ac WLAN Adapter
bcdDevice 0.00
iManufacturer 1 Realtek
iProduct 2 802.11ac WLAN Adapter
iSerial 3 00e04c000001
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x004a
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 8
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 2 802.11ac WLAN Adapter
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x05 EP 5 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x06 EP 6 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x07 EP 7 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x09 EP 9 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x0a EP 10 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x0b EP 11 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x0c EP 12 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 [unknown]
bDeviceSubClass 0 [unknown]
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
can't get debug descriptor: Resource temporarily unavailable
Device Status: 0x0001
Self Powered
The card initially presents itself as a storage device but then gets switched to the network card mode. It works on Arch Linux with the driver from https://github.com/morrownr/rtl8852bu for a few minutes but then produces this message:
rtl8852bu 3-4:1.0: Runtime PM usage count underflow!
iperf3 test in a bad place (the card shows -76 dBm, the router says -69 dBm):
Connected to ee:9f:80:d4:9e:c6 (on wlp0s20u3)
SSID: SGP
freq: 5745.0
RX: 490066262 bytes (179598 packets)
TX: 343791219 bytes (255289 packets)
signal: -76 dBm
rx bitrate: 576.4 MBit/s 80MHz HE-MCS 5 HE-NSS 2 HE-GI 0 HE-DCM 0
tx bitrate: 648.5 MBit/s 80MHz HE-MCS 6 HE-NSS 2 HE-GI 0 HE-DCM 0
[aep@aep-haswell ~]$ iperf3 -c 192.168.10.1 -p 9999
Connecting to host 192.168.10.1, port 9999
[ 5] local 192.168.12.161 port 58778 connected to 192.168.10.1 port 9999
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 34.6 MBytes 290 Mbits/sec 4 305 KBytes
[ 5] 1.00-2.00 sec 32.2 MBytes 270 Mbits/sec 0 375 KBytes
[ 5] 2.00-3.00 sec 31.9 MBytes 267 Mbits/sec 1 313 KBytes
[ 5] 3.00-4.00 sec 33.5 MBytes 281 Mbits/sec 0 385 KBytes
[ 5] 4.00-5.00 sec 35.0 MBytes 294 Mbits/sec 0 452 KBytes
[ 5] 5.00-6.00 sec 32.2 MBytes 271 Mbits/sec 1 366 KBytes
[ 5] 6.00-7.00 sec 31.0 MBytes 260 Mbits/sec 1 324 KBytes
[ 5] 7.00-8.00 sec 31.8 MBytes 266 Mbits/sec 6 127 KBytes
[ 5] 8.00-9.00 sec 25.1 MBytes 211 Mbits/sec 4 143 KBytes
[ 5] 9.00-10.00 sec 29.8 MBytes 249 Mbits/sec 1 218 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 317 MBytes 266 Mbits/sec 18 sender
[ 5] 0.00-10.01 sec 314 MBytes 264 Mbits/sec receiver
iperf Done.
[aep@aep-haswell ~]$ iperf3 -c 192.168.10.1 -p 9999 -R
Connecting to host 192.168.10.1, port 9999
Reverse mode, remote host 192.168.10.1 is sending
[ 5] local 192.168.12.161 port 38920 connected to 192.168.10.1 port 9999
[ ID] Interval Transfer Bitrate
[ 5] 0.00-1.00 sec 43.5 MBytes 365 Mbits/sec
[ 5] 1.00-2.00 sec 48.1 MBytes 403 Mbits/sec
[ 5] 2.00-3.00 sec 41.0 MBytes 344 Mbits/sec
[ 5] 3.00-4.00 sec 48.5 MBytes 407 Mbits/sec
[ 5] 4.00-5.00 sec 36.6 MBytes 307 Mbits/sec
[ 5] 5.00-6.00 sec 43.2 MBytes 363 Mbits/sec
[ 5] 6.00-7.00 sec 44.9 MBytes 376 Mbits/sec
[ 5] 7.00-8.00 sec 40.8 MBytes 342 Mbits/sec
[ 5] 8.00-9.00 sec 44.2 MBytes 371 Mbits/sec
[ 5] 9.00-10.00 sec 40.1 MBytes 337 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 434 MBytes 364 Mbits/sec 0 sender
[ 5] 0.00-10.00 sec 431 MBytes 362 Mbits/sec receiver
iperf Done.
iperf3 test using ALFA Network AWUS036AXML in approximately the same location, for comparison (the card shows -69 dBm, the router says -77 dBm):
[aep@aep-haswell ~]$ iperf3 -c 192.168.10.1 -p 9999
Connecting to host 192.168.10.1, port 9999
[ 5] local 192.168.12.244 port 40150 connected to 192.168.10.1 port 9999
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 11.6 MBytes 97.4 Mbits/sec 0 513 KBytes
[ 5] 1.00-2.00 sec 13.0 MBytes 109 Mbits/sec 0 1017 KBytes
[ 5] 2.00-3.00 sec 12.4 MBytes 104 Mbits/sec 0 1.21 MBytes
[ 5] 3.00-4.00 sec 12.5 MBytes 105 Mbits/sec 0 1.35 MBytes
[ 5] 4.00-5.00 sec 13.1 MBytes 110 Mbits/sec 0 1.50 MBytes
[ 5] 5.00-6.00 sec 11.1 MBytes 93.2 Mbits/sec 0 1.50 MBytes
[ 5] 6.00-7.00 sec 14.5 MBytes 122 Mbits/sec 0 1.65 MBytes
[ 5] 7.00-8.00 sec 20.8 MBytes 174 Mbits/sec 0 1.84 MBytes
[ 5] 8.00-9.00 sec 19.4 MBytes 163 Mbits/sec 0 1.84 MBytes
[ 5] 9.00-10.00 sec 19.4 MBytes 162 Mbits/sec 0 1.94 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 148 MBytes 124 Mbits/sec 0 sender
[ 5] 0.00-10.02 sec 146 MBytes 122 Mbits/sec receiver
iperf Done.
[aep@aep-haswell ~]$ iperf3 -c 192.168.10.1 -p 9999 -R
Connecting to host 192.168.10.1, port 9999
Reverse mode, remote host 192.168.10.1 is sending
[ 5] local 192.168.12.244 port 40498 connected to 192.168.10.1 port 9999
[ ID] Interval Transfer Bitrate
[ 5] 0.00-1.00 sec 26.2 MBytes 220 Mbits/sec
[ 5] 1.00-2.00 sec 27.6 MBytes 232 Mbits/sec
[ 5] 2.00-3.00 sec 28.4 MBytes 238 Mbits/sec
[ 5] 3.00-4.00 sec 28.5 MBytes 239 Mbits/sec
[ 5] 4.00-5.00 sec 28.2 MBytes 237 Mbits/sec
[ 5] 5.00-6.00 sec 28.1 MBytes 236 Mbits/sec
[ 5] 6.00-7.00 sec 28.5 MBytes 239 Mbits/sec
[ 5] 7.00-8.00 sec 28.9 MBytes 242 Mbits/sec
[ 5] 8.00-9.00 sec 28.9 MBytes 242 Mbits/sec
[ 5] 9.00-10.00 sec 28.9 MBytes 242 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.01 sec 286 MBytes 240 Mbits/sec 0 sender
[ 5] 0.00-10.00 sec 282 MBytes 237 Mbits/sec receiver
iperf Done.
This again confirms my negative recommendation against the bulkier but slower ALFA Network AWUS036AXML.
Thanks for the heads up. This is exactly why I have not added the CF-952 to the Plug and Play List. That model number has been confusing since the beginning.
Seller confuses this with CF953AX easily, actually this happened also when I ordered my CF953AX, CF952AX arrived instead.
