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[madbiologist <1319630@xxxxxxxxxxxxxxxxxx>]

This might be fixed in the Ubuntu 15.04 "Vivid Vervet" kernel
3.19.0-17.17 by this commit:

iwlwifi: fix max_ht_ampdu_exponent for older devices

The diff file mentions your Intel Corporation Centrino Advanced-N +
WiMAX 6250 2x2 AGN.

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https://bugs.launchpad.net/bugs/1319630

Title:
  85% performance hit in iwlwifi from 12.04 to 14.04

Status in linux package in Ubuntu:
  Won't Fix

Bug description:
  Summary: Almost 10 times slower speeds using 14.04 compared with 12.04
  (same machine). Using iperf,  Precise: 172 Mbits/sec. Trusty: 27.4
  Mbits/sec. Using rsync: Precise: 19.83MB/s. Trusty: 3.12MB/s.

  Details:

  Machine:
      Laptop Toshiba Satellite A665
      Triple boot Ubuntu 12.04, 13.04 and 14.04

  Network (same network for both):
      d-link router
      5Ghz rage

  Wireless card: Centrino

  $ lspci -nnk | grep -iA2 network
  07:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N + WiMAX 6250 [Kilmer Peak] [8086:0087] (rev 5f)
   Subsystem: Intel Corporation Centrino Advanced-N + WiMAX 6250 2x2 AGN [8086:1301]
   Kernel driver in use: iwlwifi

  12.04 Precise
  #######################################################################

  $ lsb_release -a
  Distributor ID:	Ubuntu
  Description:	Ubuntu 12.04.4 LTS
  Release:	12.04
  Codename:	precise

   $ uname -a
  Linux vanhalen 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

  $ iperf -c reinhardt
  ------------------------------------------------------------
  Client connecting to reinhardt, TCP port 5001
  TCP window size: 23.5 KByte (default)
  ------------------------------------------------------------
  [  3] local 192.168.1.105 port 43135 connected with 192.168.1.1 port 5001
  [ ID] Interval       Transfer     Bandwidth
  [  3]  0.0-10.0 sec   206 MBytes   172 Mbits/sec

  $ rsync -vP LAS.s22e10.432p.mp4 reinhardt:./
  user@reinhardt's password:
  LAS.s22e10.432p.mp4
     235861112 100%   19.83MB/s    0:00:11 (xfer#1, to-check=0/1)

  sent 235889984 bytes  received 31 bytes  14296364.55 bytes/sec
  total size is 235861112  speedup is 1.00

  14.04 Trusty
  #######################################################################

  $ lsb_release -a
  Distributor ID:	Ubuntu
  Description:	Ubuntu 14.04 LTS
  Release:	14.04
  Codename:	trusty

  $ uname -a
  Linux vanhalen 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

  $ iperf -c reinhardt
  ------------------------------------------------------------
  Client connecting to reinhardt, TCP port 5001
  TCP window size: 85.0 KByte (default)
  ------------------------------------------------------------
  [  3] local 192.168.1.105 port 49807 connected with 192.168.1.1 port 5001
  [ ID] Interval       Transfer     Bandwidth
  [  3]  0.0-10.1 sec  32.9 MBytes  27.4 Mbits/sec

  $ rsync -e "ssh -p2312" -vP LAS.s22e10.432p.mp4 reinhardt:./
  user@reinhardt's password:
  LAS.s22e10.432p.mp4
      235,861,112 100%    3.12MB/s    0:01:12 (xfr#1, to-chk=0/1)

  sent 235,918,776 bytes  received 34 bytes  2,930,668.45 bytes/sec
  total size is 235,861,112  speedup is 1.00

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-extra-3.13.0-24-generic 3.13.0-24.47
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  pablo      1977 F.... pulseaudio
   /dev/snd/controlC0:  pablo      1977 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed May 14 22:38:47 2014
  HibernationDevice: RESUME=UUID=fed461e0-ae63-4fb1-8d92-8140a1b06551
  InstallationDate: Installed on 2014-05-13 (2 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: TOSHIBA Satellite A665
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=77c75c70-93b5-41fa-984c-4fa7f9473ffc ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/14/10
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: 1.80
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: NWQAA
  dmi.board.vendor: TOSHIBA
  dmi.board.version: 1.00
  dmi.chassis.asset.tag: *
  dmi.chassis.type: 9
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnTOSHIBA:bvr1.80:bd09/14/10:svnTOSHIBA:pnSatelliteA665:pvrPSAW3U-0DE039:rvnTOSHIBA:rnNWQAA:rvr1.00:cvnTOSHIBA:ct9:cvrN/A:
  dmi.product.name: Satellite A665
  dmi.product.version: PSAW3U-0DE039
  dmi.sys.vendor: TOSHIBA

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