Arch Linux

haruue

Member

Registered: 2018-09-25

Posts: 1

Interrupt storm when switching WLAN

I always encounter a interrupt storm when I try to switch WLAN on my laptop with

sudo netctl switch-to wlp3s0-MyMobileNetwork

The interrupt storm always occurred in 1 minute after I just switch WLAN, with about 500k-1000k interrupts per second, and lasts about 5-10 minutes before it back to normal. It eats about 50% CPU and makes my laptop slow.

I paste the output of dstat -cdnmy here:

--total-cpu-usage-- -dsk/total- -net/total- ------memory-usage----- ---system--
usr sys idl wai stl| read  writ| recv  send| used  free  buff  cach| int   csw 
 46   2  52   0   0|   0     0 | 685B    0 |6600M 3367M 44.0k 6130M| 870k 3456 
 45   1  54   0   0|   0     0 | 739B  102B|6600M 3367M 44.0k 6130M| 866k 2837 
 45   2  53   0   0|   0     0 | 685B    0 |6600M 3367M 44.0k 6130M| 879k 2883 
 46   1  53   0   0|8192B    0 | 685B    0 |6600M 3367M 44.0k 6130M| 867k 2629 
 45   1  54   0   0|   0     0 | 685B  102B|6600M 3367M 44.0k 6130M| 863k 2544 
 44   1  55   0   0|   0     0 | 739B    0 |6600M 3367M 44.0k 6130M| 858k 2476 
 45   2  53   0   0|   0     0 | 685B    0 |6600M 3367M 44.0k 6130M| 873k 2797 

I checked /proc/interrupts but find nothing, I pasted them into the web pastebin:
interrupt storm: https://cfp.vim-cn.com/cbfnQ
normally: https://cfp.vim-cn.com/cbfnR

I also checked journalctl -xe, but find nothing, I pasted the journal between the WLAN switching and interrupt storm end into the web pastebin: (all non-English characters has been translated in /*comment*/)
https://cfp.vim-cn.com/cbfnS

The output of uname -a is:

Linux icymoon-dell.host.haruue.moe 4.18.7-arch1-1-ARCH #1 SMP PREEMPT Sun Sep 9 11:27:58 UTC 2018 x86_64 GNU/Linux

And the wireless network controller information from lspci is:

03:00.0 Network controller: Intel Corporation Wireless 3160 (rev 83)

For related network information, I run tinc (Pre-version 1.1pre16-1), wireguard (0.0.20180910-1) on my laptop, and redirect all TCP connection to a local port with iptables. I tried to stop them before I switch WLAN but interrupt storm still occurred.

I have googled but can't find any related or similar problem.

How can I debug it?

Last edited by haruue (2018-10-10 11:20:52)