I enabled enabled -proposed and installed 4.4.0-155.182, and went through the test case on a c5.large instance on aws. Note, I used the -generic kernel since -aws doesn't seem to be ready yet.
The problem is solved and performance is the same as non-snapshot mounted disks. We can see that merging has been enabled by looking at the flag: $ cat /sys/block/nvme1n1/queue/nomerges 0 The problem is fixed. Changing tag to verified. ** Tags removed: verification-needed-xenial ** Tags added: verification-done-xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1833319 Title: Performance degradation when copying from LVM snapshot backed by NVMe disk To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1833319/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
