PCI Express Speed Changes Still Being Worked On For Nouveau

Support for altering the PCI Express speed with the Nouveau DRM driver is still being worked on for improving the open-source NVIDIA driver's performance.

Karol Herbst today published the fourth version of the PCI Express speed changes. These nine patches add support for parsing the capable PCI speed from the video BIOS for "tesla" GPUs and newer, wires up support for changing the PCI Express speed for Tesla/Fermi/Kepler (and newer), and then lastly hooks up support for changing the PCI-E speed based upon the performance state (pstate) level.

These latest PCI-E speed change patches can be found here albeit the bigger fruit for greater Nouveau performance is still on fixing up the re-clocking support, which Karol has continued hacking on as well.