same crummy performance on quantal, so the bad performance may be unrelated:
vishvananda@nebstack006:~$ sudo dd if=/dev/zero of=/dev/mapper/clean1 bs=1M count=1024 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 15.2082 s, 70.6 MB/s vishvananda@nebstack006:~$ time sudo dd if=/dev/zero of=/dev/mapper/clean1 bs=1M count=1024 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 8.00752 s, 134 MB/s real 0m8.017s user 0m0.008s sys 0m1.116s -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1023755 Title: Precise kernel locks up while dd to /dev/mapper files > 1Gb (was: Unable to delete volume) To manage notifications about this bug go to: https://bugs.launchpad.net/cinder/+bug/1023755/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
