Ubuntu
gvfs package

  1. Bug #197762
  2. Comment #131

Comment 131 for bug 197762

Revision history for this message
psypher (psypher246) wrote : Re: file transfers on USB disk are very slow

I wil have to disagree with about ram. busy trying to clone my root partition with dd to a usb hard drive. booted with jaunty 32bit live cd and started the process with dd if=/dev/sda3 of=/media/disk/image.img conv=sync,noerror bs=64K. 1st 10GB flew by at 25-30MB/s then started slowing down to 10MB/s till about 25GB and then crawls at 3MB/s. stopped it around 53GB after about 5 hours and tried turning off USB legacy emulation in the BIOS as suggested by some other posts. started the process again and the EXACT same thing happened. ram usage is not a factor at all:

                          total used free shared buffers cached
Mem: 3095648 1243452 1852196 0 763720 264116
-/+ buffers/cache: 215616 2880032
Swap: 1638588 0 1638588

rebooted to switch the sata hard drive to ahci. could not boot ubuntu at all so thats not a workaround. had the same issue on my desktop. not sure how you are supposed to get any ubuntu booted in ahci mode.

also tried manually mounting the usb drive and also made no difference. in fact i have tried this when i was still running hardy and it made no difference then. so as far as I am concerned there is no workaround for this problem at all. started the clone last night at 11:30 and is still running now at 9:30 and is only on 63GB. shocking.

This issue has been plaguing us since hardy and is frankly embarrassing for OSS and Ubuntu.
This is not a medium bug IMO but should be marked as CRITICAL. Need to do emergency clone of a hard drive you cannot expect someone to wait 12 hours for something that should take 1 or 2 This bug was logged a year ago. what can be done to fix it finally???