I can tell you how to reproduce it easily: It has todo with the filesize.
Try to copy a file which is larger than 4.X GB and the CPU usage bumps up to > 90%.
I can safely reproduce it. Leech a file (lets say 5 GB) - CPU usage 90%. Stop it - CPU usage normal. Restart it CPU usage 90%.
Stop it and start smaller files - CPU usage normal.
Move the same large file to an ext3 drive - CPU usage normal.
Give it a try, I can safely reproduce this behavior for months now.
I can tell you how to reproduce it easily: It has todo with the filesize.
Try to copy a file which is larger than 4.X GB and the CPU usage bumps up to > 90%.
I can safely reproduce it. Leech a file (lets say 5 GB) - CPU usage 90%. Stop it - CPU usage normal. Restart it CPU usage 90%.
Stop it and start smaller files - CPU usage normal.
Move the same large file to an ext3 drive - CPU usage normal.
Give it a try, I can safely reproduce this behavior for months now.