kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Aaron Whitehouse, I was a little surprised you didn't see a noticeable
performance improvement when putting the router in compatibility mode.

Despite this, to confirm it's not just downstepping your speed with the same method, if you put the router in compatibility mode, keep power management off (and going forward on all future test), and then execute the following in Ubuntu does it change anything (a simple yes/no is fine here):
sudo rmmod iwlwifi
sudo modprobe iwlwifi 11n_disable=1

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https://bugs.launchpad.net/bugs/1450755

Title:
  Intel Wireless-N 2230 4x faster in Windows 7 than 15.04 (iwlwifi)

Status in linux package in Ubuntu:
  Expired

Bug description:
  My Intel wireless card is significantly slower in Ubuntu than it is in Windows 7. Turning off Power Management didn't change anything. I'm using the latest upstream firmware:
  iwlwifi 0000:07:00.0: loaded firmware version 18.168.6.1 op_mode iwldvm

  According to iperf (with the laptop a couple of feet from the router and the server plugged into it):
  == Ubuntu 15.04 ==
  [  4] local 192.168.0.102 port 5001 connected with 192.168.0.3 port 43672
  [ ID] Interval       Transfer     Bandwidth
  [  4]  0.0-10.1 sec  23.2 MBytes  19.3 Mbits/sec

  == Windows 7 ==
  [  4] local 192.168.0.102 port 5001 connected with 192.168.0.3 port 49247
  [  4]  0.0-10.1 sec  98.4 MBytes  82.0 Mbits/sec

  Transfer rates for previous Ubuntu releases are about the same:
  13.10:
  [ ID] Interval       Transfer     Bandwidth
  [  3]  0.0-10.1 sec  22.6 MBytes  18.9 Mbits/sec
  14.10
  [ ID] Interval       Transfer     Bandwidth
  [  3]  0.0-10.1 sec  27.8 MBytes  23.1 Mbits/sec

  WiFi Router details:
  Virgin Media Superhub 2 (Netgear VMDG485)
  Boot Code Version PSPU-Boot 1.0.20.1356
  Software Version V1.01.29
  Hardware Version 3.11

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-15-generic 3.19.0-15.15
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  aaron      2193 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri May  1 10:37:38 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-04-26 (734 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Dell Inc. Inspiron 5423
  ProcFB:
   0 inteldrmfb
   1 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-15-generic root=UUID=e429a76e-75c0-44b9-90d4-a75ee21d98a2 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-15-generic N/A
   linux-backports-modules-3.19.0-15-generic  N/A
   linux-firmware                             1.143
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-04-25 (5 days ago)
  dmi.bios.date: 08/03/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: 0RMVR3
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A03
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA03:bd08/03/2012:svnDellInc.:pnInspiron5423:pvrNotSpecified:rvnDellInc.:rn0RMVR3:rvrA03:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Inspiron 5423
  dmi.product.version: Not Specified
  dmi.sys.vendor: Dell Inc.

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