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Re: [Ilw] RX laggy/choppy/stuck without TX on Intel Wireless 7260 with iwlwifi

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On Sat, Feb 22, 2014 at 10:18 PM, Grumbach, Emmanuel
<emmanuel.grumbach@xxxxxxxxx> wrote:
>>
>> (Resending as plain text)
>>
>> I have a strange issue with my Intel Wireless 7260 adapter on my Dell XPS 13
>> (Haswell). It seems that packets are received but aren't processed by the
>> kernel or something until more packets are transmitted. The net effect is
>> that the laptop's wireless seems somewhat choppy. I can demonstrate this
>> by running something in a remote ssh session that generates periodic
>> output, and that output doesn't appear until I generate more outgoing
>> traffic. It's hard to describe it beyond that, but I took a screen capture which
>> demonstrates this very well:
>> http://www.youtube.com/watch?v=4RMURSMszmc
>>
>> lspci shows the wireless card as: 02:00.0 Network controller: Intel Corporation
>> Wireless 7260 (rev 6b) uname -a: Linux dalek 3.11.0-12-generic #19-Ubuntu
>> SMP Wed Oct 9 16:20:46UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
>>
>> I googled this without success. I can gather diagnostic information if you send
>> me instructions, I'm just not sure where to start or what to look for. Is this a
>> bug in the driver? Maybe in the card microcode itself? Has anyone else
>> reported this issue? It seems very strange.
>> Any help is appreciated.
>
> Can you please send the output of dmesg?
> Tracing output can help too - but let's start with dmesg output.
>

My full dmesg output is here: http://smkent.net/stuff/dmesg-dalek-20140222

Here's some selected output. I'm not sure if it's useful.

smkent@dalek Desktop $ grep -ie iwl -e 80211 dmesg-dalek-20140222
[    3.968070] cfg80211: Calling CRDA to update world regulatory domain
[    3.976500] iwlwifi 0000:02:00.0: can't disable ASPM; OS doesn't
have ASPM control
[    3.976585] iwlwifi 0000:02:00.0: irq 59 for MSI/MSI-X
[    4.115345] iwlwifi 0000:02:00.0: loaded firmware version 22.1.7.0
op_mode iwlmvm
[    4.157435] iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band
Wireless AC 7260, REV=0x144
[    4.157523] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[    4.157691] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[    4.269377] cfg80211: World regulatory domain updated:
[    4.269383] cfg80211:   (start_freq - end_freq @ bandwidth),
(max_antenna_gain, max_eirp)
[    4.269387] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz),
(300 mBi, 2000 mBm)
[    4.269390] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz),
(300 mBi, 2000 mBm)
[    4.269393] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz),
(300 mBi, 2000 mBm)
[    4.269396] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz),
(300 mBi, 2000 mBm)
[    4.269399] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz),
(300 mBi, 2000 mBm)
[    4.379283] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[    4.709497] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[    4.709671] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[ 9676.817175] cfg80211: Calling CRDA to update world regulatory domain
[ 9676.823809] cfg80211: World regulatory domain updated:
[ 9676.823820] cfg80211:   (start_freq - end_freq @ bandwidth),
(max_antenna_gain, max_eirp)
[ 9676.823827] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz),
(300 mBi, 2000 mBm)
[ 9676.823834] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz),
(300 mBi, 2000 mBm)
[ 9676.823840] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz),
(300 mBi, 2000 mBm)
[ 9676.823846] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz),
(300 mBi, 2000 mBm)
[ 9676.823851] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz),
(300 mBi, 2000 mBm)
[ 9680.014722] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[ 9680.014890] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S

I haven't taken a kernel trace before but I'm happy to do so if you
can point me toward some instructions.

Thanks,

Stephen
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