100% CPU usage while copying between HDD's

[Maxym]

Binary package hint: linux-image-2.6.28-11-generic

Description: Ubuntu 9.04
Release: 9.04
Linux home 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:58:03 UTC 2009 x86_64 GNU/Linux

hardware:
Asus P5Q SE
Q9600
2 Gb DDR2 800Mhz Ram
2 SATA Hdd`s (320Gb and 1Tb)

When I copy from one hdd to another I get 100%(or almost 100%) CPU usage. And the speed of copying is not very high. It's about 30MiB/s.
If i copy 2 file in parallel - I can't use my pc. Everything stucks till the copy process is over.

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
NonfreeKernelModules: nvidia
Package: kdm 4:4.2.2-0ubuntu2
ProcEnviron:
 LANGUAGE=
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kdebase-workspace
Uname: Linux 2.6.28-11-generic x86_64

[Maxym (max-kutsevol)]

lspci -vvnn

[Francisco J. Yáñez (fjyaniez)]

I have exactly the same problem :(

[Francisco J. Yáñez (fjyaniez)]

another lspci -vvnn

[Francisco J. Yáñez (fjyaniez)]

another dmesg

[reportandobugs (reportandobugs)]

Not exactly the same here. Copying from one hd to another at about 34 MBs puts de cpu htop meter in 50 per cent, more or less and the load average into 2.04. 90 per cent of memory asigned to cache.

This is a behaveour i have already saw with other distros like gentoo or whatsoever anyway i dont understand why such a load to the cpu and to the load of the system just to copy a bunch of files. Maybe some guru cant illustrate me.

Ubuntu 9.10
Kernel 2.6.28-14-server