Public bug reported: USB transfers to/from flash drives are very slow. Disk Utility reports the various drives I've tried are connected at 480Mb/s, but it's rare to see transfers faster than 50-60Mb/s at best, probably less as nautilus only reports average speed which is skewed by the first 300Mb being buffered.
Sometimes I get the first 300MB very fast followed by very slow and ending with a long pause while the write buffer writes out, sometimes they're just very slow from the start. Doesn't seem to matter if I'm transferring one big file or lots of little files. Seems faster with USB HDs. Flash drives I've tried so far are all working fine in other OSes on the same machine. Also occurring with bleeding edge kernel (which I'm using because anything younger won't suspend properly on my machine), 3.5.0-999-generic #201207280406 SMP Sat Jul 28 08:07:29 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux. The reason I'm reporting it here rather than at kernel.org is that I don't think it's a kernel bug, I think it's to do with Debian/Ubuntu's kernel patches. Because it doesn't happen in the live version of Fedora 17 I tried, but it does happen with Debian Wheezy. Windows 7 is also fast. Laptop is a Toshiba L830-114. Attached is a usbmon log of dd if=/dev/zero of=/media/littlun/tmp oflag=direct bs=120K count=2K as recommended by Ming Lei here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/834476 ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.2.0-27-generic 3.2.0-27.43 ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21 Uname: Linux 3.2.0-27-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu11 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: mat 1731 F.... pulseaudio Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xc0600000 irq 43' Mixer name : 'Intel PantherPoint HDMI' Components : 'HDA:14f1506e,1179fb90,00100003 HDA:80862806,1179fb90,00100000' Controls : 25 Simple ctrls : 12 CurrentDmesg: [ 30.118970] wlan1: no IPv6 routers present Date: Thu Aug 2 20:18:24 2012 HibernationDevice: RESUME=UUID=99547817-de1c-4c35-9bb3-845962582ed6 InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425) MachineType: TOSHIBA SATELLITE L830 ProcEnviron: LANGUAGE=en_GB:en TERM=xterm PATH=(custom, no user) LANG=en_GB.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-27-generic root=UUID=1c27fdd8-65a9-4b9c-8e8b-ba5e4660a55b ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.2.0-27-generic N/A linux-backports-modules-3.2.0-27-generic N/A linux-firmware 1.79 SourcePackage: linux StagingDrivers: mei UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 06/11/2012 dmi.bios.vendor: Insyde Corp. dmi.bios.version: 1.50 dmi.board.asset.tag: Type2 - Board Asset Tag dmi.board.name: Type2 - Board Product Name1 dmi.board.vendor: Type2 - Board Vendor Name1 dmi.board.version: Type2 - Board Version dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: OEM Chassis Manufacturer dmi.chassis.version: OEM Chassis Version dmi.modalias: dmi:bvnInsydeCorp.:bvr1.50:bd06/11/2012:svnTOSHIBA:pnSATELLITEL830:pvrPSK7YE-00J004EN:rvnType2-BoardVendorName1:rnType2-BoardProductName1:rvrType2-BoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion: dmi.product.name: SATELLITE L830 dmi.product.version: PSK7YE-00J004EN dmi.sys.vendor: TOSHIBA ** Affects: linux (Ubuntu) Importance: Undecided Status: Confirmed ** Tags: amd64 apport-bug precise quantal staging -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1032342 Title: file transfers to/from USB flash drives very slow To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1032342/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
