@Todd are you sure they are not swappable? according to lwn they are: http://lwn.net/Articles/423584/ """ This scheme will increase the use of huge pages transparently, but it does not yet solve the whole problem. Huge pages must be swappable, lest the system run out of memory in a hurry. Rather than complicate the swapping code with an understanding of huge pages, Andrea simply splits a huge page back into its component small pages if that page needs to be reclaimed. Many other operations (mprotect(), mlock(), ...) will also result in the splitting of a page. """
also the performance regression might be fixed in 3.11; http://kernel.opensuse.org/cgit/kernel/commit/?id=348944504362417205107e63cfe4821aa87ec1bb mm: fix aio performance regression for database caused by THP -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/743688 Title: Transparent HugePages not enabled in 11.04 kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/743688/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
