Description of problem: My external USB 2.0 disk normally running at about 20MB/s when writing and 25MB/s when reading on any other Linux system (Ubuntu, Knoppix, SUSE) reads only at about 12MB/s when reading under FC5. Writing is ok. The speed reduction does not depend on the filesystem in use (tested with vfat, ext3 and xfs) Version-Release number of selected component (if applicable): udev 084-13, kernel 2.6.16-1.2080_FC5 i686 How reproducible: disconnect and reconnect the disk, then use: dd if=/media//PORTY/mifi/test.dat of=/dev/null or time cp /media/PORTY/mifi/test.dat /dev/null Actual results: 1073741824 bytes (1.1 GB) copied, 88.8305 seconds, 12.1 MB/s Expected results: 1073741824 bytes (1.1 GB) copied, 50.8846 seconds, 21.1 MB/s Additional info: changing the "dd" blocksize to some value between 512 and 8M does not effect the reading speed.
Problem gone with kernel 2.6.16-1.2096_FC5