Public bug reported:
Finally, I know why 9.04 feels so slow compared to previous release.
Upon file operations (like copying) CPU usage goes up to almost 100%.
What's worse, it doesn't show up in htop, as it's the kernel which uses
CPU.
This bug is not related to the filesystem used - I tested it with ext3,
ext4 and vfat fs.
I attach an oprofile report, which may or may not be useful to kernel
hackers. The profiler ran for a short time while copying a 150 mb file
from one ext4 partition to another. There were many calls to
"copy_to_user_ll" and "copy_from_user_ll" routines.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Very high CPU usage during file operations
https://bugs.launchpad.net/bugs/365775
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