SRU Justification: Impact: After dropping a sauce patch to make vesafb a module we accidentally dropped a change to make mtrr:3 (write-combining remap range) the default. This results in a performance degradation for graphics cards that have no drm framebuffer driver (especially on higher resolutions).
Fix: Change default for mtrr setting from none to 3 (write-combining). Testcase: With any hardware that ends up having vesafb (VESA VGA) as framebuffer device performance is slower and the mapped address will not show up in /proc/mtrr. After changing the default /proc/mtrr should show a write-combining entry and performance should be improved. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1434581 Title: Console extremely slow with 3.13 and newer kernels for certified servers with Matrox G200er2 or similar To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1434581/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
