I'm running 12.04 so I gave the 3.4 kernel a try ( http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4-precise/ ). It appears that the performance is about the same, if not worse, with 3.4.
Here are the results: mutex 1 thread real 0m 0.515s user 0m 0.508s sys 0m 0.004s 2 threads real 0m 4.305s user 0m 4.848s sys 0m 3.728s 4 threads real 0m12.149s user 0m 9.553s sys 0m33.058s 8 threads real 0m23.016s user 0m15.909s sys 1m15.709s 16 threads real 0m54.892s user 0m36.570s sys 3m 2.347s benaphore 1 thread real 0m 0.319s user 0m 0.316s sys 0m 0.000s 2 threads real 0m 6.692s user 0m 6.880s sys 0m 5.824s 4 threads real 0m21.479s user 0m15.269s sys 0m59.448s 8 threads real 0m43.105s user 0m26.278s sys 2m25.581s 16 threads real 1m22.735s user 0m55.827s sys 4m34.185s mutex2 1 thread real 0m 0.322s user 0m 0.316s sys 0m 0.004s 2 threads real 0m 0.843s user 0m 1.088s sys 0m 0.564s 4 threads real 0m 2.323s user 0m 3.516s sys 0m 5.648s 8 threads real 0m 4.184s user 0m 5.576s sys 0m11.049s 16 threads real 0m 8.070s user 0m10.841s sys 0m21.253s ** Tags removed: needs-upstream-testing ** Tags added: kernel-bug-exists-upstream -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1058864 Title: Poor mutex and semaphore performance To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1058864/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
