Are you able to reproduce the bug easily? If so, we can test some upstream kernels[0] to try and find the last good kernel and first bad kernel. If we can find those two, I can perform a kernel bisect to identify the specific commit that introduced the regression.
[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/ ** Changed in: linux (Ubuntu) Importance: Undecided => High ** Tags added: kernel-da-key ** Tags added: performing-bisect -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1325819 Title: I/O performance problems with kernel 3.15.x To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1325819/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
