Please strace the e4defrag process to see if it is spinning in userspace or in the kernel. If it is spinning in the kernel, then it's a kernel bug, not an e2fsrpogs problem. And since you're using a non-Ubuntu kernel, you'll need to take this to the upstream linux-ext4 mailing list.
If it turns out to be a case of spinning in the kernel, what we'll want to know is whether you can easily reproduce the problem, and if so, whether you can give us a kernel stack trace by using magic-sysrq-l and magic-sysrq-t. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to e2fsprogs in Ubuntu. https://bugs.launchpad.net/bugs/1398434 Title: e4defrag has fatal CPU performance bottleneck Status in e2fsprogs package in Ubuntu: New Bug description: During defragmentation of a 5 TB ext4 filesystem with one 600 GB file with current value of 300000 and optimal value of 300 shown by `e4defrag -c`, `e4defrag' seems to suffer from a huge CPU performance bottleneck. Over hours only one CPU core is used (-> no parallelization) and there's almost no I/O during that time <1 % of the underlying device's capabilities. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: e2fsprogs 1.42.10-1.1ubuntu1 Uname: Linux 3.17.4-031704-generic x86_64 ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 CurrentDesktop: Unity Date: Tue Dec 2 16:29:12 2014 SourcePackage: e2fsprogs UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/e2fsprogs/+bug/1398434/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
