I ran a few more tests on another PC and got some very interesting results.
The PC has an ASUS P5KPL-VM motherboard based on the Intel G31 chipset. The results were the same for Kubuntu jaunty 64-bit and Kubuntu Jaunty 32-bit. So it's not a problem of the hardware (unless it's the USB flash drive itself) and it's not a problem of the 64-bit version. I also used the pci=routeirq and the pci=noacpi options on boot with no effect. BUT... the problem does not appear in Hardy or Intrepid. It only appears in jaunty. All tests were conducted after clean installs and with no updates. The following are average times as reported from dd: Hardy avl...@avlass-desktop:~$ dd if=/dev/zero of=/media/disk/test-file bs=32 ^C32215401+0 records in 32215401+0 records out 1030892832 bytes (1.0 GB) copied, 79.614 s, 12.9 MB/s Intrepid avl...@avlass-intrepid32:~$ dd if=/dev/zero of=/media/disk/test-file bs=32 ^C112570144+0 records in 112570144+0 records out 3602244608 bytes (3.6 GB) copied, 315.495 s, 11.4 MB/s Jaunty avl...@avlass-kubuntu64:~$ dd if=/dev/zero of=/media/disk/test-file bs=32 ^C63138817+0 records in 63138817+0 records out 2020442144 bytes (2.0 GB) copied, 311.369 s, 6.5 MB/s I also attach the output of dstat for the Intrepid test ** Attachment added: "dstat output G31 PC Kubuntu intrepid 32 5min.txt" http://launchpadlibrarian.net/28542920/dstat%20output%20G31%20PC%20Kubuntu%20intrepid%2032%205min.txt -- Slow USB transfer for FAT32 https://bugs.launchpad.net/bugs/392089 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
