Very Slow USB Transfers

[gregk]

I get USB transfer speeds of about 2.4Mb/s to USB 2.0 devices. Very weird. The same devices work fine on other computers.

A driver bug maybe? I wonder how I can even begin to figure out where the problems lies here.

[greg@bravado ~]$ lspci | grep USB
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 02)
00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 02)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 02)

[jpollard]

Try using a VT and see if the performance improves.

[gregk]

Originally Posted by jpollard

Try using a VT and see if the performance improves.

Sorry, what is a VT?

[jpollard]

A VT is a virtual terminal. You normally get one using Ctrl-alt-F<2,3,..6> from the GUI display. and can switch back using alt-F7-8.

Trying it in a VT separates scheduling of user processes in the GUI from the transfer. This has been a problem (apparently caused by the automatic process groups created) that seems to primarily affect large file transfers. Trying the transfer in a VT puts it in a new scheduling group. It doesn't guarantee speed though.

[gregk]

Originally Posted by jpollard

A VT is a virtual terminal. You normally get one using Ctrl-alt-F<2,3,..6> from the GUI display. and can switch back using alt-F7-8.

Trying it in a VT separates scheduling of user processes in the GUI from the transfer. This has been a problem (apparently caused by the automatic process groups created) that seems to primarily affect large file transfers. Trying the transfer in a VT puts it in a new scheduling group. It doesn't guarantee speed though.

Thanks for the tip, but the speeds where the same. There must be a driver problem. I don't know why I would have speed of 2.4MB/s for USB 2.0.

Edit: From looking here http://ocaoimh.ie/2009/05/07/ubuntu-...nal-usb-drive/ maybe I need to make sure the USB drivers are booting in the correct order. But how do I do this on Fedora?