Ubuntu
linux package

  1. Bug #624510
  2. Comment #28

Comment 28 for bug 624510

Revision history for this message
Axis Mann (axismann) wrote :

I further observed that the write speed to the external USB drive, for Lucid, is a lot better than the read speed. I'm seeing write speeds around 30MB/s which is ok. However, the read speed continues to be extremely slow. Nautilus was telling me that the file transfer speed was around 5 MB/sec when copying from the external USB drive to an internal SATA drive. I started a capture using the command

  cat /sys/kernel/debug/usb/usbmon/1u > /tmp/1u.mon.out

before connecting the external drive and then beginning the copy of a 5 GB file from the external USB drive using Nautilus to copy the file to an internal SATA drive. After about 100 MB, I killed the trace with the CTRL-C key and then cancelled the copy.

The trace is about 2.6 MB of plain text. How can I get that to you? Surely you don't want me to try to paste it here?