Comment 144 for bug 119730

Same problem here also with Karmic Koala.
uname : Linux AMD64 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:05:01 UTC 2009 x86_64 GNU/Linux
My sata disks show ok performances if tested with hdparm:

/dev/sdb:
 Timing cached reads: 1912 MB in 2.00 seconds = 956.43 MB/sec
 Timing buffered disk reads: 224 MB in 3.01 seconds = 74.47 MB/sec

/dev/sdc:
 Timing cached reads: 1892 MB in 2.00 seconds = 945.87 MB/sec
 Timing buffered disk reads: 332 MB in 3.00 seconds = 110.64 MB/sec

But if I try to copy a file from one place to another (same disk, same or different partition or different disk) I get steady really poor performances of between 2 and 4 MB/sec.
In addition, the whole system becomes really slow while copying.
This is both using cp in a console or using Gnome and has been for a while.
All my disks/partitions are formated ext3.

My SATA controller is :
00:05.0 IDE interface: nVidia Corporation MCP55 SATA Controller (rev a2)

I hope this problem will get a solution, it is quite difficult to work with big file in the current situation. I would be glad to provide any additional info if it can help.

Franck