System running Ubuntu Jaunty AMD64, vanilla 2.6.29.1. KDE4.2, two terminal windows, no other graphical applications.
I created two test files of identical size with random data and copied to the USB pendrive, once on a freshly rebooted system, and once after I first experienced a slowdown while copying some other files to the pendrive and deleting them again; doing a "sync" after each copy. A second terminal window ran dstat -D sda,sdb both times. ( Preparation: dd if=/dev/urandom of=/var/tmp/850-MiB-testfile.A bs=1M count=850 dd if=/dev/urandom of=/var/tmp/850-MiB-testfile.B bs=1M count=850 reboot ) First run after reboot: (/dev/sdb1 mounted on /media/pendrive) cp /var/tmp/850-MiB-testfile.A /media/pendrive Second run after the first slowdowns were observed during copying of other files and deleting them again: cp /var/tmp/850-MiB-testfile.B /media/pendrive The output results of "dstat -D sda,sdb" are attached. First run, approx. 16 MiB/sec constant: dstat-D.OK.850-MiB-random- data.txt Second run with slowdown: dstat-D.slow.850-MiB-random-data.txt I'm sorry, I couldn't figure out what causes the slowdown after a while. I'm doing some more tests tomorrow, with other kernel versions and with a borrowed USB harddisk. -- file transfers on USB disk are very slow https://bugs.launchpad.net/bugs/197762 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
