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:

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


I used this command for a test write:

a...@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

** Attachment added: "dstat_out.log"
   http://launchpadlibrarian.net/27379927/dstat_out.log

-- 
[jaunty] usb file transfer is very very slow
https://bugs.launchpad.net/bugs/334914
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