USB on Linux

Ralfs

USB on Linux

Flash drive

My USB flash stop working under fc3 and I wonder why!
Problem is in kernel 2.6.10 - module ehci_hcd
Remove USB 2.0 support:

$ rmmod ehci_hcd

Put USB flash drive, that work with USB 1.0 (uhci_hcd)

$ hdparm -t /dev/sdb

/dev/sdb:
 Timing buffered disk reads:   20 MB in  3.21 seconds =   6.24 MB/sec

$ eject /media/RALFS512
$ rmmod ehci_hcd
$ hdparm -t /dev/sdb

 /dev/sdb:
  Timing buffered disk reads:    4 MB in  4.08 seconds = 1002.85 kB/sec

Difference is 480 Mbit/s or 12 Mbit/s

Last modified: 13.02.2005