usb 2.0 driver performance issue

hi,

I am Manoj from Mumbai, India. I am having problems with my USB 2.0
pen drive on linux. i am having the same problem on almost all linux
distros i tried and i think it might have something to do with the
linux usb drivers. i am not sure though,
please correct me if i am wrong. i don't mind a detailed explanation
as to why this is happening :).

I have a 2 GB USB pen drive. while writing large amount of data (~2GB)
to the pen drive , the kernel load( as shown by gnome system monitor
applet) shoots up to around 6 to 7, the entire gui becomes very
unresponsive and the system feels  laggy. i have 1 GB Ram. the mem
usage during the transfer is quite high and eats almost my entire Ram.
my home machine is a gentoo on amd64. i tried it on ubuntu, mandriva
and fedora i386. all had the same issues. Also, sometimes, it takes a
lot of time (about 2-3 minutes sometimes) to unmount the pen drive.
apparently, some amount of the data to be transferred is cached and it
is flushed to the device only when i give the umount command. i am
using default I/O scheduler - "CFQ" and pre-emption model - "voluntary
kernel preemption(Desktop)".

thanks.

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