kernel-packages team mailing list archive

[Thomas M Steenholdt <1289961@xxxxxxxxxxxxxxxxxx>]

Lots of talk about bandwidth, but (IMHO) at least as interesting is ping
times (because the results are instantly visible):

I'm on a ThinkPad T431s with an "Intel Corporation Centrino Advanced-N
6235 (rev 24)"

3.13.0-24-generic without PM (pinging my AP):

$ ping -c 5 192.168.8.2
PING 192.168.8.2 (192.168.8.2) 56(84) bytes of data.
64 bytes from 192.168.8.2: icmp_seq=1 ttl=64 time=0.882 ms
64 bytes from 192.168.8.2: icmp_seq=2 ttl=64 time=0.948 ms
64 bytes from 192.168.8.2: icmp_seq=3 ttl=64 time=0.960 ms
64 bytes from 192.168.8.2: icmp_seq=4 ttl=64 time=0.768 ms
64 bytes from 192.168.8.2: icmp_seq=5 ttl=64 time=0.848 ms

--- 192.168.8.2 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4002ms
rtt min/avg/max/mdev = 0.768/0.881/0.960/0.072 ms

3.13.0-24-generic with PM (pinging my AP):

$ ping -c 5 192.168.8.2
PING 192.168.8.2 (192.168.8.2) 56(84) bytes of data.
64 bytes from 192.168.8.2: icmp_seq=1 ttl=64 time=96.9 ms
64 bytes from 192.168.8.2: icmp_seq=2 ttl=64 time=17.2 ms
64 bytes from 192.168.8.2: icmp_seq=3 ttl=64 time=39.4 ms
64 bytes from 192.168.8.2: icmp_seq=4 ttl=64 time=61.9 ms
64 bytes from 192.168.8.2: icmp_seq=5 ttl=64 time=84.7 ms

--- 192.168.8.2 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4005ms
rtt min/avg/max/mdev = 17.298/60.076/96.938/29.065 ms

-- 
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1289961

Title:
  8086:08b2 [Lenovo ThinkPad T440s] Power management causes Intel wifi
  7260 slowness

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  In Ubuntu Trusty (Gnome) with my ThinkPad T440s using Intel 7260 ac
  wireless the download speed reaches an upper limit 400 kB/s instead of
  the normal 1500 kB/s I get with some other PC connected to my network.
  The speed often slows down very very low, especially when I'm far away
  from my AP. Removing N mode does not solve the issue.

  WORKAROUND: Remove wireless interface's power management via Powertop

  ---
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ft         1884 F.... pulseaudio
   /dev/snd/controlC0:  ft         1884 F.... pulseaudio
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=54b265b9-4433-42d4-8d0f-fac028ee7030
  InstallationDate: Installed on 2014-03-05 (46 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
  Lsusb:
   Bus 001 Device 002: ID 8087:8000 Intel Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20AQCTO1WW
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=b1cbc034-b66f-4f6c-9d61-507b8cb23ffe ro quiet
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  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
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.13.0-24-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 03/28/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET75WW (2.25 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AQCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98405 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGJET75WW(2.25):bd03/28/2014:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AQCTO1WW
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO

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