You can see https://help.ubuntu.com/community/DiskPerformance for general advice on testing performance of a disk and reporting your issue. Your snip from dmesg tells that you plugged in a USB 2.0 device, but that is about what can be said from that information, so further performance tests are certainly required.
Murz and Digital5700:
Your issues with noop as a much better scheduler than cfq are very interesting, but I'm not sure what the best way forward is, bug #381300 and #131094 already exists without really going anywhere. If you can make a good report with dstat numbers etc. and with the newest upstream kernel compiled from git there should be a good chance of getting Jens Axboe looking into the issue (he's the upstream kernel developer that maintains the I/O scheduler subsystem).
RishiRamraj:
You can see https:/ /help.ubuntu. com/community/ DiskPerformance for general advice on testing performance of a disk and reporting your issue. Your snip from dmesg tells that you plugged in a USB 2.0 device, but that is about what can be said from that information, so further performance tests are certainly required.
Murz and Digital5700:
Your issues with noop as a much better scheduler than cfq are very interesting, but I'm not sure what the best way forward is, bug #381300 and #131094 already exists without really going anywhere. If you can make a good report with dstat numbers etc. and with the newest upstream kernel compiled from git there should be a good chance of getting Jens Axboe looking into the issue (he's the upstream kernel developer that maintains the I/O scheduler subsystem).
alex123: /help.ubuntu. com/community/ DiskPerformance.
You should verify that your front panel USB connections are not USB 1.1, see https:/