Comment 27 for bug 107545

Nice to hear that! If compiz and glxgears influences your frame rate and burnP6 with lower prio does not, then it is most likely a problem with 3D graphics. It's strange that changing up_threshold does make a difference. But IMHO this points to a race condition in the video driver.

In Jaunty the ATI, Intel and I think also Nvidia drivers are under heavy development. Perhaps you find a solution in a radeon/intel/nouveau bug or you could help by filing a new bug with your observations. If you do further experiments with process priorities (= nice values) then first disable "ignore_nice_load" (see https://bugs.launchpad.net/ubuntu/+source/linux/+bug/107545/comments/22). Otherwise the results are too complicated to interpret.