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[Bug 1319630] Re: 85% performance hit in iwlwifi from 12.04 to 14.04

 

My Dell XPS 14Z has Intel Centrino Advanced 6230 WLAN adapter and with
Linux driver, the connection often drops and even the bandwidth is
reduced to 5 Mpbs from 25 Mpbs which I get in Windows. I am aware that
the bug was present even in Windows but a firmware update is released.

I tried to follow Ubuntu forums and wireless Kernel page to keep track
of this bug and I didn't find any change to this Linux driver or even a
work around. I followed the suggestions from the forums and the result
is unfruitful and remains the same with each iteration of Kernel
version.

I tried 15.04, other variants of Linux distribution although knowing
that every distribution use the same firmware from kernel.org. I lost my
hope already and looking for an alternative PCI-e Wifi adapter.  For
almost three years, Linux community couldn't give a solution and I think
they even hate the idea of releasing a patch.

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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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