Public bug reported: 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 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. 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. ** Affects: linux (Ubuntu) Importance: Undecided Status: Confirmed ** Tags: amd64 apport-bug quantal running-unity -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1069766 Title: Slow transfer speeds with BCM 4331 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1069766/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
