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Thread: Wild WiFi latency on Intel driver - 13.04

  1. #1
    Join Date
    May 2013
    Beans
    2

    Question Wild WiFi latency on Intel driver - 13.04

    Hey Everyone

    I'm getting high and inconsistent latency on WiFi connections... As a baseline I'm sitting next to the router, when I boot Windows and ping the router I get an average of 5ms. If I boot into Ubuntu 13.04 I get anything from 25ms up to 200ms and occasional lost packets...

    My hardware is a relatively new Dell XPS 13 Ultrabook and the built-in WiFi device is an Intel one. My Ubuntu 13.04 is up to date and I'm just using the standard drivers provided by the Kernel/Ubuntu.

    Any advice or tips for resolution would be so good!!

    Code:
    C:\Users\andrew>ping 192.168.0.1 -t
    
    Pinging 192.168.0.1 with 32 bytes of data:
    Reply from 192.168.0.1: bytes=32 time=18ms TTL=64
    Reply from 192.168.0.1: bytes=32 time=6ms TTL=64
    Reply from 192.168.0.1: bytes=32 time=8ms TTL=64
    Reply from 192.168.0.1: bytes=32 time=3ms TTL=64
    Reply from 192.168.0.1: bytes=32 time=3ms TTL=64
    Reply from 192.168.0.1: bytes=32 time=3ms TTL=64
    Reply from 192.168.0.1: bytes=32 time=3ms TTL=64
    Reply from 192.168.0.1: bytes=32 time=3ms TTL=64
    Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
    Reply from 192.168.0.1: bytes=32 time=3ms TTL=64
    Reply from 192.168.0.1: bytes=32 time=5ms TTL=64
    Reply from 192.168.0.1: bytes=32 time=9ms TTL=64
    Reply from 192.168.0.1: bytes=32 time=3ms TTL=64
    
    
    Ping statistics for 192.168.0.1:
        Packets: Sent = 13, Received = 13, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
        Minimum = 1ms, Maximum = 18ms, Average = 5ms
    Control-C
    ^C
    Code:
    andrew@:~$ ping 192.168.0.1
    PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
    64 bytes from 192.168.0.1: icmp_req=1 ttl=64 time=89.6 ms
    64 bytes from 192.168.0.1: icmp_req=2 ttl=64 time=109 ms
    64 bytes from 192.168.0.1: icmp_req=3 ttl=64 time=29.9 ms
    64 bytes from 192.168.0.1: icmp_req=4 ttl=64 time=52.4 ms
    64 bytes from 192.168.0.1: icmp_req=5 ttl=64 time=75.4 ms
    64 bytes from 192.168.0.1: icmp_req=6 ttl=64 time=98.3 ms
    64 bytes from 192.168.0.1: icmp_req=7 ttl=64 time=19.1 ms
    64 bytes from 192.168.0.1: icmp_req=8 ttl=64 time=42.1 ms
    64 bytes from 192.168.0.1: icmp_req=9 ttl=64 time=65.2 ms
    ^C

  2. #2
    Join Date
    Aug 2011
    Location
    Berlin, Germany
    Beans
    5,725
    Distro
    Ubuntu Gnome 14.04 Trusty Tahr

    Re: Wild WiFi latency on Intel driver - 13.04

    Deactivate the N-mode of the driver (bug):
    Code:
    echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
    sudo modprobe -rfv iwlwifi
    sudo modprobe -v iwlwifi
    Check also:
    Code:
    ifconfig -a

  3. #3
    Join Date
    May 2013
    Beans
    2

    Re: Wild WiFi latency on Intel driver - 13.04

    Thank you praseodym, though I found I had to run the following command to get the driver to remove correctly first:

    Code:
    modprobe -rvf iwldvm
    My latency is now a nice 2ms.

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