Re: Debugging iwlagn intermittent connectivity issue

[Paul Jones <pajones gmail com>]

On Tue, Jun 9, 2009 at 8:53 AM, Dan Williams<dcbw redhat com> wrote:
> On Mon, 2009-06-08 at 15:20 -0700, Paul Jones wrote:
>> Hi,
>>    I was hoping to get some help with a intermittent connectivity
>> issue using Ubuntu Intrepid (8.10). My wireless connection (iwlagn)
>> seems to fail intermittently for 15-30s at a time as frequently as
>> every couple of minutes. NetworkManager doesn't report that the
>> connection has failed and there doesn't seem to be anything of note in
>> syslog or wpa_supplicant.log.
>
> What kernel version?  Kernels earlier than 2.6.30 have bugs relating to
> scanning that could well be causing your problem.
$uname -a
Linux Athena 2.6.27-11-generic #1 SMP Wed Apr 1 20:53:41 UTC 2009
x86_64 GNU/Linux

>Are you loading
> iwlagn with any module options?
Just the default options that Ubuntu provides.
>systool -m iwlagn -av
Module = "iwlagn"

  Attributes:
    initstate           = "live"
    refcnt              = "0"
    srcversion          = "5226C1C38C52E6FF73CF4C8"
    version             = "1.3.27ks"

  Parameters:
    11n_disable         = "0"
    11n_disable50       = "0"
    amsdu_size_8K       = "1"
    amsdu_size_8K50     = "1"
    antenna             = "0"
    debug               = "0"
    debug50             = "0"
    disable50           = "0"
    disable_hw_scan     = "0"
    disable             = "0"
    fw_restart4965      = "1"
    fw_restart50        = "1"
    qos_enable          = "1"
    qos_enable50        = "1"
    queues_num          = "16"
    queues_num50        = "20"
    swcrypto            = "0"
    swcrypto50          = "N"

  Sections:
    .bss                = "0xffffffffa03b1c00"
    .data               = "0xffffffffa03aeaa0"
    .devexit.text       = "0xffffffffa03a6044"
    .exit.text          = "0xffffffffa03a6028"
    .gnu.linkonce.this_module= "0xffffffffa03afa00"
    .init.text          = "0xffffffffa006e000"
    .note.gnu.build-id  = "0xffffffffa03a61f8"
    .parainstructions   = "0xffffffffa03a8628"
    .rodata             = "0xffffffffa03a6220"
    .rodata.str1.1      = "0xffffffffa03a815c"
    .rodata.str1.8      = "0xffffffffa03a67a8"
    .smp_locks          = "0xffffffffa03a84b0"
    .strtab             = "0xffffffffa03abf00"
    .symtab             = "0xffffffffa03a8918"
    .text               = "0xffffffffa0396000"
    __bug_table         = "0xffffffffa03a83d5"
    __param             = "0xffffffffa03a8648"



>
> Dan
>
>>    I have no idea where this bug could be located and I would like
>> some help with debugging. I have experienced the bug using three
>> difference AP. I haven't eliminated a hardware issue however, as I've
>> only run this laptop using Intrepid. But hardware seems unlikely as
>> the problem is alleviated by rebooting. I have experienced the bug
>> with every Intrepid kernel that has been released thus far. The bug
>> seems to occur mainly when the wireless network is under load. For
>> instance, when I'm streaming videos off of Hulu.
>>
>>    I have posted a bug report here
>> (https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/384924).
>> It should contain much of the relevant information.
>>
>>    I appreciate any help your experience can bring. Thanks for your time
>>
>> Paul
>> _______________________________________________
>> NetworkManager-list mailing list
>> NetworkManager-list gnome org
>> http://mail.gnome.org/mailman/listinfo/networkmanager-list
>
>