FS#41459 - [linux] 3.15.x wlwifi(Intel DualBand Wireless-AC 7260) disconnect silently
Attached to Project:
Arch Linux
Opened by Tomasz Borkowski (Tomasz) - Monday, 04 August 2014, 13:13 GMT
Last edited by Doug Newgard (Scimmia) - Friday, 15 August 2014, 15:56 GMT
Opened by Tomasz Borkowski (Tomasz) - Monday, 04 August 2014, 13:13 GMT
Last edited by Doug Newgard (Scimmia) - Friday, 15 August 2014, 15:56 GMT
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Details
* Description:
WLAN Network Interface fails silently if Intel Dual Band Wireless-AC 7260 works under high load and in ac/5GHz mode. Additional info: * package version(s) - Arch Lunux x86_64 (core, extra, community, multilib) state from 2014.08.04 14:00 CET - Kernel 3.15.8-1-ARCH #1 SMP PREEMPT Fri Aug 1 08:51:42 CEST 2014 x86_64 GNU/Linux (but also older 3.15 versions) - - (auto)loaded iwlwifi module with default options * config and/or log files etc. - I use a Cisco's WAP371 Wireless-AC/N Dual Radio Access Point and connect it in ac mode; 5GHz frequency-band (channel 36). - I could observe the same misbehavior using 2 different laptops; Lenovo's Z370 and Samsung's Serie 4 (410B) and 2 different exemplars of the same WLAN-card; Intel Wireless-AC 7260.HMWWB. - The WLAN network interface quits to work almost every time I copy huge files (size of 1.5 GB or more) over the WLAN. - The disconnection appear always silently, i.e. the are no according log-records in /var/log/everything.log. Neither Network Manager (applet) nor iwconfig utility notices such disconnections. First hi-level sw-components report timeout errors after a while. - Reconnecting to AP (click on the SSID name of the disconnected AP in Network Manager applet) or restarting wpa_supplicant (hang-up signal) activates the WLAN interface again. - The problem seems not to occur if the 2.4 GHz bandwidth is used or if the network load is low. - If the signal strength is hi (over 60%), the problem seems to occur significantly more seldom. Steps to reproduce: 1. Connect an other computer using local Intel Dual Band Wireless-AC 7260 via a Wireless-AC Access Point (in my case Cisco WAP371) configured for ac/5GHz mode (in my case channel 36). 2. The signal strength should be less then 55% 3. Try to copy a huge file (.e.g. 2-4 GB) over WLAN, try it again and again if the failure does not appears. In my case about 8 trials of copying form 10 fail. |
This task depends upon
Closed by Doug Newgard (Scimmia)
Friday, 15 August 2014, 15:56 GMT
Reason for closing: Not a bug
Additional comments about closing: Closed at user request.
Friday, 15 August 2014, 15:56 GMT
Reason for closing: Not a bug
Additional comments about closing: Closed at user request.
Unfortunately, the issue seems to be much worse under 3.16 ;-(
Wifi was hanging yet after copying about 40 MB (of 3.6 GB) - with kernel 3.15 the connection failed usually after copying more than 1 GB.
Additionally under kernel 3.16 I can observe serious wifi-troubles in AC-mode (very bad/hanging connection, disconnections) yet under low network load, really very bad behavior.
I just hope, there will be a new firmware for Intel Wireless-AC 7260, better cooperating with the kernel 3.16.
Status after farther tests with Kernel 3.16:
Having switched radio on my Cisco AP to the mode first from 802.11/n/ac(the mode I used by default earlier) to 802.11/a and recently to 802.11/a/n/ac I was able to copy my test file (3.6 GB) twice without any disconnections ;-)).
I am not sure if this change helped or if the reboot the AP after installing Kernel 3.16 caused the improvement, so I am going make some additional tests in the next days and to observe the behavior of wifi. Then I will report here the results.
I'm sorry for putting the cat among the pigeons - please close
FS#41459.