Painfully slow Wif on 410c wcn36xx


Hi Folks:
Installed Linaro Ubuntu 15.09 ( also tried 15.06 ) and unable to get wlan0 to anything above 1Mb/sec.
Not seeing a wcn36xx.conf modules file, updated the WCNSS_qcom_cfg.init driver file but no change ( does module need to be recompiled? ). Any thoughts on boosting this performance? AP is known good, have 3 other hosts ( Win/Linux ) using it at 54Mb/sec, would like to get the 410c to do the same ( or better ).

config, dmesg wcn36xx references below.


linaro@linaro-alip:/$ sudo find . -type f -name “WCN*” -exec file {} ; | egrep -i -v ‘(exec|bin)’
./lib/firmware/wlan/prima/WCNSS_cfg.dat: data
./lib/firmware/wlan/prima/WCNSS_qcom_cfg.ini: ASCII text
./lib/firmware/wlan/prima/WCNSS_wlan_dictionary.dat: ASCII text, with CRLF line terminators
linaro@linaro-alip:/$ iwconfig wlan1
wlan1 IEEE 802.11abgn ESSID:"Homey2"
Mode:Managed Frequency:2.457 GHz Access Point: 84:1B:5E:51:35:3F
Bit Rate=1 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=42/70 Signal level=-68 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:1 Missed beacon:0

linaro@linaro-alip:/$ nmcli d wifi list

    ATT6iG3z3A Infra 11 54 Mbit/s 59 ▂▄▆_ WPA1 WPA2
    myjazzi Infra 4 54 Mbit/s 19 ▂___ WPA1 WPA2
    Howdy Infra 1 54 Mbit/s 7 ▂___ WPA1 WPA2
    HP-Print-2A-Officejet 4630 Infra 1 54 Mbit/s 5 ____ WPA2
    Howdy-guest Infra 1 54 Mbit/s 5 ____ –
  • Homey2 Infra 10 54 Mbit/s 60 ▂▄▆_ WPA2

linaro@linaro-alip:/$ dmesg | grep -i wcn36 | more
[ 5.762379] msm8916-pinctrl 1000000.pinctrl: request pin 40 (GPIO_40) for a000000.qcom,wcn36xx
[ 5.762395] msm8916-pinctrl 1000000.pinctrl: request pin 41 (GPIO_41) for a000000.qcom,wcn36xx
[ 5.762409] msm8916-pinctrl 1000000.pinctrl: request pin 42 (GPIO_42) for a000000.qcom,wcn36xx
[ 5.762423] msm8916-pinctrl 1000000.pinctrl: request pin 43 (GPIO_43) for a000000.qcom,wcn36xx
[ 5.762436] msm8916-pinctrl 1000000.pinctrl: request pin 44 (GPIO_44) for a000000.qcom,wcn36xx
[ 9.284157] wcn36xx-msm a000000.qcom,wcn36xx: wcn36xx_msm_probe initialized
[ 9.317643] wcn36xx wcn36xx: no of_node; not parsing pinctrl DT
[ 9.318420] wcn36xx wcn36xx: Direct firmware load for wlan/macaddr0 failed with error -2
[ 9.318434] wcn36xx wcn36xx: Falling back to user helper
[ 69.337549] wcn36xx wcn36xx: Failed (-11) to read macaddress file wlan/macaddr0, using a random address instead
[ 69.337672] wcn36xx: mac address: 00:0a:f5:82:4c:24
[ 69.517136] wcn36xx wcn36xx wlan1: renamed from wlan0
[ 69.969044] wcn36xx: firmware WLAN version ‘WCN v2.0 RadioPhy vRhea_GF_1.12 with 19.2MHz XO’ and CRM version ‘CNSS-PR-2-0-1-2-c1-
[ 69.969077] wcn36xx: firmware API, 41 stations, 2 bssids
[ 69.972144] wcn36xx: FW Cap MCC
[ 69.972167] wcn36xx: FW Cap P2P
[ 69.972183] wcn36xx: FW Cap SLM_SESSIONIZATION
[ 69.972198] wcn36xx: FW Cap DOT11AC_OPMODE
[ 69.972212] wcn36xx: FW Cap SAP32STA
[ 69.972227] wcn36xx: FW Cap TDLS
[ 69.972241] wcn36xx: FW Cap P2P_GO_NOA_DECOUPLE_INIT_SCAN
[ 69.972255] wcn36xx: FW Cap WLANACTIVE_OFFLOAD
[ 69.972269] wcn36xx: FW Cap BEACON_OFFLOAD
[ 69.972283] wcn36xx: FW Cap SCAN_OFFLOAD
[ 69.972297] wcn36xx: FW Cap BCN_MISS_OFFLOAD
[ 69.972312] wcn36xx: FW Cap STA_POWERSAVE
[ 69.972326] wcn36xx: FW Cap STA_ADVANCED_PWRSAVE
[ 69.972340] wcn36xx: FW Cap BCN_FILTER
[ 69.972354] wcn36xx: FW Cap RTT
[ 69.972367] wcn36xx: FW Cap RATECTRL
[ 69.972381] wcn36xx: FW Cap WOW
[ 69.972395] wcn36xx: FW Cap WLAN_ROAM_SCAN_OFFLOAD
[ 69.972410] wcn36xx: FW Cap SPECULATIVE_PS_POLL
[ 69.972424] wcn36xx: FW Cap IBSS_HEARTBEAT_OFFLOAD
[ 69.972438] wcn36xx: FW Cap WLAN_SCAN_OFFLOAD
[ 69.972452] wcn36xx: FW Cap WLAN_PERIODIC_TX_PTRN
[ 69.972466] wcn36xx: FW Cap ADVANCE_TDLS
[ 69.972480] wcn36xx: FW Cap BATCH_SCAN
[ 69.972493] wcn36xx: FW Cap FW_IN_TX_PATH
[ 69.972507] wcn36xx: FW Cap EXTENDED_NSOFFLOAD_SLOT
[ 69.972521] wcn36xx: FW Cap CH_SWITCH_V1
[ 69.972535] wcn36xx: FW Cap HT40_OBSS_SCAN
[ 69.972549] wcn36xx: FW Cap UPDATE_CHANNEL_LIST
[ 69.972563] wcn36xx: FW Cap UNKNOWN
[ 69.972576] wcn36xx: FW Cap UNKNOWN
[ 69.972590] wcn36xx: FW Cap UNKNOWN
[ 69.972603] wcn36xx: FW Cap UNKNOWN
[ 69.972617] wcn36xx: FW Cap UNKNOWN
[ 69.972630] wcn36xx: FW Cap UNKNOWN
[ 69.972644] wcn36xx: FW Cap UNKNOWN
[ 69.972658] wcn36xx: FW Cap UNKNOWN
[ 69.972671] wcn36xx: FW Cap UNKNOWN
[ 69.972684] wcn36xx: FW Cap UNKNOWN
[ 70.024925] wcn36xx: CSR_RESET: 0x10001


Timmy527, could you please share how you measure the average speed?
Through simple download (wget and aria2), I tend to be getting a little
above 2MiB/s. On my Linux desktop with the same download, I get above


If you have a linux box on the same network, could you execute:

user@dragon > iperf -s
user@box    > iperf -c  dragon_ip

and report that number please?


Hi Folks:
Used wget and scp to download/copy some larger ( 25MB ) files.
Download rate typically ranged from 200 - 400Kb/sec, upload rate was closer to the 1Mb/sec.
Painfully slow…

  I'll run the iperf stats when I get home but just looking for details on how to boost/config this 



Also, note that hosts connecting to the same AP saw same signal strength and negotiated upwards of 54Mb/sec, and consequently saw considerably faster download/upload speeds.


I am measuring 22 Mbits/sec on release 15.07.

Using exactly same setup I measured 27.7 Mbits/sec on a lenovo x220 running ubuntu 14.04.


I am sometimes seeing problems (slow or delays) with my wireless, but isolated tests (iperf) show good performance (25-30Mbits/sec). I have noticed in the system log that I am receiving lots of:

Oct 26 22:10:34 localhost.localdomain kernel: wcn36xx: ERROR SMD_EVENT (259) not supported
Oct 26 22:11:40 localhost.localdomain kernel: wcn36xx: ERROR SMD_EVENT (259) not supported
Oct 26 22:12:52 localhost.localdomain kernel: wcn36xx: ERROR SMD_EVENT (259) not supported
Oct 26 22:13:53 localhost.localdomain kernel: wcn36xx: ERROR SMD_EVENT (259) not supported
Oct 26 22:15:32 localhost.localdomain kernel: wcn36xx: ERROR SMD_EVENT (259) not supported
Oct 26 22:17:00 localhost.localdomain kernel: wcn36xx: ERROR SMD_EVENT (259) not supported
Oct 26 22:18:00 localhost.localdomain kernel: wcn36xx: ERROR SMD_EVENT (259) not supported
Oct 26 22:19:46 localhost.localdomain kernel: wcn36xx: ERROR SMD_EVENT (259) not supported

and every couple of minutes I see:

Oct 26 18:02:24 localhost.localdomain kernel: wlan0: deauthenticated from 44:94:fc:53:ca:fc (Reason: 7=CLASS3_FRAME_FROM_NONASSOC_STA)
Oct 26 18:02:25 localhost.localdomain kernel: wlan0: authenticate with 44:94:fc:53:ca:fc
Oct 26 18:02:25 localhost.localdomain kernel: wlan0: send auth to 44:94:fc:53:ca:fc (try 1/3)
Oct 26 18:02:25 localhost.localdomain kernel: wlan0: authenticated
Oct 26 18:02:25 localhost.localdomain kernel: wlan0: associate with 44:94:fc:53:ca:fc (try 1/3)
Oct 26 18:02:25 localhost.localdomain kernel: wlan0: RX AssocResp from 44:94:fc:53:ca:fc (capab=0x411 status=0 aid=3)
Oct 26 18:02:25 localhost.localdomain kernel: wlan0: associated

I’m not sure if anyone else is experiencing this, or if it is a known issue, but I was curious if it could be affecting performance. I am not using wireless from my workstation, so I don’t have a lot of experience with wireless on this router, but the frequency of these messages seems cause for concern, unless they are just ‘debugging’ messages left on in this kernel (4.2.0-linaro-lt-qcom #1 SMP PREEMPT Thu Oct 15 15:24:52 UTC 2015 aarch64).


I should have read more before posting. I see the ‘wcn36xx: ERROR SMD_EVENT (259) not supported’ messages are a known issue:

and not something that would affect performance.


Hi guys,
I tried to reproduce this problem in my side. But can’t hit the slow throughput issue. I kept
the Dragonboard running for two days and test the throughput by downloading a file by using
ftp from another Linux box periodically. The ftp throughput is about 5.92MiB/s:
lftp fyin@> get virtio-vsock-\ Zero-configuration\ host-guest\ communication\ by\ Stefan\ Hajnoczi.mp4
361076395 bytes transferred in 58 seconds (5.92 MiB/s)

BTW, my AP is very close to my Dragonboard. Not sure whether it matters.

Yin, Fengwei


The message “Oct 26 22:19:46 localhost.localdomain kernel: wcn36xx: ERROR SMD_EVENT (259) not supported” shouldn’t impact the throughput.

The message “Oct 26 18:02:24 localhost.localdomain kernel: wlan0: deauthenticated from 44:94:fc:53:ca:fc (Reason: 7=CLASS3_FRAME_FROM_NONASSOC_STA)” means the connection was shutdown by AP. There are many reasons triggering it.
And yes, this could impact the wifi throughput.


Hi Folks:
Reimaged the 410c with Android ( release 15.9 ) and connected with the same AP at 72Mb/sec rate. Througput in/out ( downloads/uploads ) is significantly faster. This should rule out the HW as the curlprit. Any suggestiongs on how to this host to negotiate to a higher data rate with the AP when it’s running Ubuntu?



Could you please show how you measure the wireless throughput?


Measured throughput with Browser downloads from remote and local hosts.
From remote hosts ( linero/google ) was seeing almost wire speed up/down through the cable modem, from local hosts
was seeing almost 10MB/sec ( ~80Mb/sec ) in both directions.

Granted the Android tests were not extremely thorough but the bigger interest is how do
I get the Ubuntu AP connection to be something over 1Mb/sec data rate, as mentioned the Android AP connection data rate was 72Mb/sec. The Ubuntu host is not going to push much data if the only data rate is knows is 1Mb/sec.

The issue I’m trying to solve is pushing the wifi data rate on the Ubuntu host higher than the 1Mb/sec that’s stated as the negotiated rate in ifconfig. Surrounding hosts are negotiating significantly higher rates on the same AP.



Thanks for the information.

Again, I got 5.92MiB/s (~48Mb/sec) in my side with Ubuntu 15.09. But I have AP very close to dragonboard.
And it’s very stable in my two days testing.

Did you see the deauthenticated info a lot like dmarlin?


I’ve got the same problem and don’t know how to resolve it.

Anybody has a solution.



One more question: do you use BT with wifi together? If I use BT with wifi together in my side, I got very bad wifi throughput. If I only have wifi, the throughput is about 6MB/s.


At this moment I don’t use BT due that I received DB410C only two weeks ago. I solved several problems but Wifi connection still at 1 Megabit/s (max. throughput less than 100 Kbytes/s). I tried with four different Wifi connections (with distinct wifi routers and providers) and DB410c doesn’t connect. When connects the bit rate its only at 1 Mb/s.

I read in some linaro blogs that could be a bug and try different solutions, but the problem still persistent.