I did a bunch of tests. First of all, I'm attaching the output of: cat /proc/version_signature dmesg sudo lspci -vvnn sudo lsusb -vv
I used Ubuntu Jaunty kernel "2.6.28-9-generic", except for the log of "lsusb", which was acquired when the system was running under 2.6.29-rc7, vanilla, from kernel.org. The system is the latest Kubuntu Jaunty alpha with updates as of 10 March 2009; architecture: AMD64. I did the tests running KDE 4.2.1-0ubuntu5 and used the automatic "pop-up" feature to mount a 16-GiB USB pendrive specified for a minimum throughput of approx. 14 MiB/sec. These are my observations: Copying large files (i.e. approx. 8 GiB) from high-performance harddisk to the USB drive using _Microsoft Windows XP SP2_, the above-all average transfer speed is 13...14 MiB/sec. This is always reproducible. Using my Ubuntu system: When _copying large files using KDE_, after the first 3GiB or so, the transfer rate drops from the initial 14 MiB/sec to an average of about 5.5 MiB/sec. The indicated speed on the progress window fluctuates between a few kiB/sec and full speed. Using the _command line_ and timing the following commands using a shellscript yields /slightly higher/ average transfer speeds, approx. 7 MiB/sec. Ubuntu kernel 2.6.28-9-generic and a custom 2.6.29-rc7: No difference. Conclusion: Using Ubuntu, the transfer speed is always less than half the speed than under MS Windows XP. I did at least 20 tests with different file sizes, file systems on the pendrive (VFAT, EXT2, fuse NTFS3G NTFS) -- 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 Desktop Bugs, which is a bug assignee. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
