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[Bug 1471794] Re: Wifi slow on Intel Corporation Centrino Ultimate-N 6300


Full computer model name: DELL Latitude E6540
16GB of RAM
Intel Core I5 4200M
Intel Corporation Centrino Ultimate-N 6300
AMD Radeon 8790M (Mars XTX)

BIOS: A15, latest, this not correct anything for the Wireless, but this fix many bugs like keyboard or usb disconnection.

AP: 01:00.0 Network controller: Qualcomm Atheros AR93xx Wireless Network Adapter (rev 01)
TP-Link TL-WDN4800 ( http://www.tp-link.fr/products/details/?categoryid=1683&model=TL-WDN4800 )
The AP are 2 servers on Ubuntu 12.04.5 LTS 64bits, but I have no problems with others devices, and this computer have Wireless problems with all others AP.

Connection type: 802.11n (Yes, the problem is the same with others types)
Channel: 1 (The problem is the same with other channels)

Wireless environnement:
DS Parameter set: channel 1
DS Parameter set: channel 1

(My 2 AP, one is approximately as 1m, and the second is 2 floors upper)

Encryption: WPA2-PSK
Nope, changing encryption don't change anything.

QoS: Nope, I have disabled this because it don't change anything for the
AP, it's not a problem for today use with others computer.

Beacon time: Default, 100
Changing beacon time: Not tested.

Firewall: Yes, but not on the wireless interface, it's on the ethernet card where internet arrive.
Nope, I don't disable the Firewall of my server, but this will close the network.
The AP is on a bridge with 2 eth, and all packet who have source br0 are accepted for input and forward.

Frequency: 2.4Ghz
Not tested in 5Ghz because too many card are not compatibles.

With an other device, the AP have no problems.

5) 1 - 2m for the tests

6) 0, this is directly next to the AP wlan card

7) Yes

8) It seem that Natty have better performances, but it's really not

Firmware version:
[        2.33682] iwlwifi 0000:03:00.0: loaded firmware version build 25532 op_mode iwldvm

15) Ndiswrapper not tested, because for the same computer, Windows 7
64bits have a really good speed. (Approximately 15MB/s up and down on my

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  Wifi slow on Intel Corporation Centrino Ultimate-N 6300

Status in linux package in Ubuntu:

Bug description:
  On Intel Corporation Centrino Ultimate-N 6300 who use iwlwifi, the
  Wifi goes approximately (in my home) to 15MB/s in up and down on
  Windows 7, but it goes only to 5 - 6MB/s down, and 1 - 3MB/s up on

  Before Ubuntu 11.04 → It was slow.
  After Ubuntu 11.04 → It was slow.

  On Ubuntu 11.04 (Only for test): The down speed is approximately
  11MB/s and the up speed is approximately: 6 - 8MB/s

  The driver contain a regression for speed performance.

  Currently I use Ubuntu 14.04 LTS with Linux 3.18.1 (Vivid package) but the speed is already slow.
  The range of the card is reduced, and I take sometimes 2 - 5min to discover a network.

  Connection/disconnection to an other network can make a bug were the
  fastest way to change network is to disable/enable the card (if it
  works), or reboot the computer.

  It make this card absolutely not reliable because of the driver on

  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
   /dev/snd/controlC1:  valentin   4266 F.... pulseaudio
   /dev/snd/controlC0:  valentin   4266 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2014-11-24 (245 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Latitude E6540
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-46-generic root=UUID=83928b5e-863a-4f13-98b2-f288f6a095dc ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-46.79-generic 3.13.11-ckt15
   linux-restricted-modules-3.13.0-46-generic N/A
   linux-backports-modules-3.13.0-46-generic  N/A
   linux-firmware                             1.127.14
  StagingDrivers: zram
  Tags:  trusty staging
  Uname: Linux 3.13.0-46-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/19/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  dmi.board.name: 0725FP
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA15:bd05/19/2015:svnDellInc.:pnLatitudeE6540:pvr01:rvnDellInc.:rn0725FP:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6540
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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