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Date: Wed, 27 May 2015 14:33:57 +0300
Message-ID: <CANUX_P07VRny8bB6MrgcPwYF16o0RLiHarbnxsC76CGhq1XnaA@mail.gmail.com> (sfid-20150527_133402_728895_4BADA201)
Subject: Re: packet loss, disconnects and possible bug in iwlwifi
From: Emmanuel Grumbach <egrumbach@gmail.com>
To: Nick Dimov <dimovnike@gmail.com>
Cc: linux-wireless <linux-wireless@vger.kernel.org>
Content-Type: text/plain; charset=UTF-8
Sender: linux-wireless-owner@vger.kernel.org

On Wed, May 27, 2015 at 3:41 AM, Nick Dimov <dimovnike@gmail.com> wrote:
> hello,
> I will record a tracing but now my kernel doesn't have
> CONFIG_IWLWIFI_TRACING  (default ubuntu kernel) so I will have to
> activate the setting and recompile it. As for wpa_supplicant - I checked
> several times and there is indeed a single process running, also its PID
> doesn't change during disconnects. Btw, I also tested with 4.0 kernel
> from the next release of ubuntu and the result is the same. Also the
> laptop is next to the router and there are no other networks on 5Ghz
> here (however the problem happens on 2.4Ghz too)

On what channel is the AP on 2.4GHz?

>
> Thank you,
> Nick.
>
> On 27.05.2015 03:27, Emmanuel Grumbach wrote:
>> On Wed, May 27, 2015 at 2:44 AM, Nick Dimov <dimovnike@gmail.com> wrote:
>>> Hello,
>>> thank you for your response. I attach the full syslog since the last
>>> boot which contains some disconnects. I enabled debug mode for
>>> wpa_supplicant with -dd option (let me know if you need anything else).
>>>
>>> I also tried connecting directly, i.e. without NetworkManager but
>>> manually with wpa_supplicant and I still get disconnects, howvever
>>> wpa_supplicant gives different logs with different drivers. Please, see
>>> the file wifi.log (you can see there the driver i used in
>>> wpa_supplicant, that log doesn't have the debug activated but let me
>>> know if you need that too)
>> Please record tracing
>> (https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi/debugging#tracing)
>> and the syslog from the *same run*. Someone is disconnecting you and I
>> can't see who and why. Are you sure you have only one instance of the
>> supplicant running?
>>
>>> Thank you again,
>>> Nick.
>>>
>>> On 25.05.2015 14:33, Emmanuel Grumbach wrote:
>>>> On Sat, May 23, 2015 at 1:28 PM, Nick Dimov <dimovnike@gmail.com> wrote:
>>>>> Hello,
>>>>> I recently bought the Intel 7260 AC wifi card (below is the PCI info)
>>>>> and the card works perfectly in windows with the latest intel driver but
>>>>> in linux I get deauthenticating and disconnects (reason -3) every minute
>>>>> or so. When these disconnects happen I get packet loss. In the attached
>>>>> file iwlwifi_dmesg.txt you can see the log that is produced each time a
>>>>> disconnect happens. I also tried connecting on 2.4Ghz but I get the same
>>>>> packet loss. I also put the last firmware from
>>>>> http://git.kernel.org/?p=linux/kernel/git/firmware/linux-firmware.git
>>>>> but it did not help.
>>>> Please increase the debug level of the supplicant. And attach the full syslog.
>>>>
>>>>> There is also another problem: In windows i can see it connecting on
>>>>> 860mbps, but on linux it never goes higher than 600mbps (i check this
>>>>> with iwconfig) and it stays somewhere on 500mbps.
>>>>>
>>>>> Can you please help me solve this?
>>>>> Thank you.
>>>>>
>>>>> uname -a
>>>>> Linux nick-laptop 3.19.0-18-generic #18-Ubuntu SMP Tue May 19 18:31:35
>>>>> UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
>>>>>
>>>>> lspci info:
>>>>> 03:00.0 Network controller: Intel Corporation Wireless 7260 (rev bb)
>>>>>         Subsystem: Intel Corporation Dual Band Wireless-AC 7260
>>>>>         Flags: bus master, fast devsel, latency 0, IRQ 29
>>>>>         Memory at f7200000 (64-bit, non-prefetchable) [size=8K]
>>>>>         Capabilities: [c8] Power Management version 3
>>>>>         Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
>>>>>         Capabilities: [40] Express Endpoint, MSI 00
>>>>>         Capabilities: [100] Advanced Error Reporting
>>>>>         Capabilities: [140] Device Serial Number d8-fc-93-ff-ff-e4-70-d7
>>>>>         Capabilities: [14c] Latency Tolerance Reporting
>>>>>         Capabilities: [154] Vendor Specific Information: ID=cafe Rev=1
>>>>> Len=014 <?>
>>>>>         Kernel driver in use: iwlwifi
>>>>>
>