Re: packet loss, disconnects and possible bug in iwlwifi

[Dan Williams <dcbw@redhat.com>]

On Wed, 2015-05-27 at 02:44 +0300, Nick Dimov 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)

Also, make sure you stop NetworkManager when you're doing the manual
connection.  With systemd, you need to 'systemctl mask NetworkManager'
and then 'systemctl stop NetworkManager' to prevent it from being D-Bus
activated too.

The reason I say this is because in your logs there are
locally-generated disconnections, and that happens when NetworkManager
is still running and hasn't been told to stop handling WiFi, and then
somebody runs another wpa_supplicant alongside.

Dan

> 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
> >>
>