kernel-packages team mailing list archive

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

Jussi Pakkanen / Seth Forshee, this bug was reported a while ago and
there hasn't been any activity in it recently. We were wondering if this
is still an issue? If so, could you please test for this with the latest
development release of Ubuntu? ISO images are available from
http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, please just make a comment to this.

As well, as a potential WORKAROUND, would the Broadcom drivers provided
via https://launchpad.net/ubuntu/+source/bcmwl provide improved
performance?

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1069766

Title:
  14e4:4331 Slow transfer speeds with BCM 4331

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  The BCM 4331 wireless chip has slow transfer speeds compared to OSX.

  I tested by transferring a big file over the wireless between this
  machine and a server that is connected to the wireless router by a
  wired connection using scp. The transfer speeds are:

  OSX upload: 7 MB/s
  OSX download: 8.5 MB/s
  Linux upload: 800 kB/s
  Linux download: 1.9 MB/s

  Uploading on Linux is 10 times slower than uploading on OSX. CPU load
  is ~14% when downloading in Linux.

  The distance between the AP and the laptop was ~5 meters with direct
  line of sight between the two. The security used is WPA2.

  The only similar symptom I found by web searching is this:
  http://ubuntuforums.org/showthread.php?t=1964768&page=2

  The workaround given on that page do not work for me.

  This is not a regression. The driver for this chipset was added in
  Precise and that had the same problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-17-generic 3.5.0-17.28
  ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
  Uname: Linux 3.5.0-17-generic x86_64
  ApportVersion: 2.6.1-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jpakkane   2017 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Date: Mon Oct 22 14:45:46 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64+mac (20120220)
  MachineType: Apple Inc. MacBookPro8,1
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-17-generic root=UUID=725f2433-59c8-46cc-9c13-ad2e4ad1548d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-17-generic N/A
   linux-backports-modules-3.5.0-17-generic  N/A
   linux-firmware                            1.95
  SourcePackage: linux
  UpgradeStatus: Upgraded to quantal on 2012-08-06 (77 days ago)
  dmi.bios.date: 01/24/12
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP81.88Z.0047.B27.1201241646
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-94245B3640C91C81
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro8,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-94245B3640C91C81
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP81.88Z.0047.B27.1201241646:bd01/24/12:svnAppleInc.:pnMacBookPro8,1:pvr1.0:rvnAppleInc.:rnMac-94245B3640C91C81:rvrMacBookPro8,1:cvnAppleInc.:ct10:cvrMac-94245B3640C91C81:
  dmi.product.name: MacBookPro8,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1069766/+subscriptions