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[Bug 1069766] Re: 14e4:4331 Slow transfer speeds with BCM 4331


I have the same issue:

~ ❯❯❯ lspci -nn -d 14e4:
02:00.0 Ethernet controller [0200]: Broadcom Corporation NetXtreme BCM57765 Gigabit Ethernet PCIe [14e4:16b4] (rev 10)
02:00.1 SD Host controller [0805]: Broadcom Corporation BCM57765/57785 SDXC/MMC Card Reader [14e4:16bc] (rev 10)
03:00.0 Network controller [0280]: Broadcom Corporation BCM4331 802.11a/b/g/n [14e4:4331] (rev 02)

~ ❯❯❯ sudo dmidecode -s system-product-name

~ ❯❯❯ uname -a
Linux manolito 3.13.0-45-generic #74-Ubuntu SMP Tue Jan 13 19:36:28 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

~ ❯❯❯ lspci -nnv 
03:00.0 Network controller [0280]: Broadcom Corporation BCM4331 802.11a/b/g/n [14e4:4331] (rev 02)
	Subsystem: Apple Inc. AirPort Extreme [106b:00d6]
	Flags: bus master, fast devsel, latency 0, IRQ 17
	Memory at a0600000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: bcma-pci-bridge

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  14e4:4331 Slow transfer speeds with BCM 4331

Status in linux package in Ubuntu:

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:

  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
   /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
   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.

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