Comment 20 for bug 334914

I have the same problem. Upgraded to Ubuntu 9.04 64-bit, upgraded with latest updates as of now (1-6-2009) Reading from USB 2.0 devices (Sandisk U3 4GB flashdrive & WD 1TB ext. HDD) is around 600kB/s - 700kB/s by observing reported speeds by Gnome/Nautilus. Same with newer kernel 2.6.28-12-generic & also tried 2.6.30-rc7.

Copying a 200MB .avi file from internal sata disk to the USB flashdrive goes fast, but nautilus copy hangs/stays for a long while at 100%. Selecting the then copied file on the USB drive and copy it to my desktop is almost instant. The 200MB is probably cached? ain't that a bit overdone? (just guessing, there is not a dev on this end).

Before I used 8.04 and 8.10 both 64 bit, speeds where reasonable but the flash drive and USB HDD where not automounted. I had to "sudo rmmod ehci_hcd" and "sudo modprobe ehci_hcd". Devices where then mounted correctly and functioning at USB 2.0 speeds.

Also when connecting my USB HDD on 9.04 it seems to be constantly busy reading/writing.

Following as attachment dstat output to my USB2.0 flash drive while using kernel:

alex@alex-desktop:~$ uname -r
2.6.28-11-generic

I used this command for a test write:

alex@alex-desktop:~$ sudo dd if=/dev/zero of=/media/sdc1/test-file bs=32
[sudo] password for alex:
^C12044320+0 records gelezen
12044320+0 records geschreven
385418240 bytes (385 MB) gekopieerd, 107,044 s, 3,6 MB/s

adding dmesg etc in following posts