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[Øyvind Stegard <oyvinst@xxxxxxxxxx>]

I confirm this issue. In my case there is a huge regression in uplink
speed with kernel 3.11.0-15-generic compared to 3.11.0-12-generic (which
is good).

With 3.11.0-15-generic, I only get sustained 400–500KB/s uplink speed
(downlink speed is better though).

With  3.11.0-12-generic the uplink speed is over 7MB/s sustained (and
over 11MB/s downlink rate).

I have an Asus RT-AC66U router with N-capabilities, but no tweaking on
router helps on the iwlwifi speed problem when running the
3.11.0-15-generic kernel. I also see the problem with other access
points.

My wifi card:
       description: Wireless interface
       product: Centrino Advanced-N 6200
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan0
       version: 35
       serial: 00:23:14:a8:0e:c0
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=3.11.0-12-generic firmware=9.221.4.1 build 25532 ip=192.168.1.100 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
       resources: irq:44 memory:d6e00000-d6e01fff

wlan0     IEEE 802.11abgn  ESSID:"Kaffefilter5G"  
          Mode:Managed  Frequency:5.2 GHz  Access Point: BC:EE:7B:7C:DC:E4   
          Bit Rate=6 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=64/70  Signal level=-46 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:290304  Invalid misc:65   Missed beacon:0


No special iwlwifi module options. Fully updated Ubuntu 13.10 x86-64.

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https://bugs.launchpad.net/bugs/1270208

Title:
  linux-image-3.11.0-15-generic appears to regress connection speed for
  iwlwifi

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I recently installed 13.10 and immediately updated to the latest
  updates via my ethernet work connection.

  Got home and noted that linux-image-3.11.0-15-generic was only able to
  transfer to my local media box via wifi at ~350kB/s (ie. Taking 10+
  minutes for a 300Mb file)

  After trawling the net for a while, the usual solution appeared to be
  "restart with 11n_disable=1 as a module option."

  That didn't solve the issue not did several other suggestions. So I
  reverted to the other kernal installed on my system linux-
  image-3.11.0-12-generic

  After booting that kernel my transfer speeds are ~3MB/s - much saner
  (though I have had things configured so I get closer to 6MB/s)

  Not sure what other info I can provide.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19 [modified: boot/vmlinuz-3.11.0-12-generic]
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  carlos     2193 F.... pulseaudio
   /dev/snd/controlC0:  carlos     2193 F.... pulseaudio
  Date: Fri Jan 17 23:59:56 2014
  HibernationDevice: RESUME=UUID=0fbe8395-5e8d-430f-823c-b5408451c73e
  InstallationDate: Installed on 2014-01-14 (3 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Dell Inc. Latitude E6520
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_AU:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  ProcFB:
   0 inteldrmfb
   1 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=22c75466-3cb5-416a-9513-8debe4246bcd ro quiet splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/11/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A14
  dmi.board.name: 0J4TFW
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA14:bd07/11/2012:svnDellInc.:pnLatitudeE6520:pvr01:rvnDellInc.:rn0J4TFW:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6520
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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