Ubuntu 12.10 Pushes Sandy Bridge Further
Phoronix: Ubuntu 12.10 Pushes Sandy Bridge Further
Recently I have shown that Intel graphics hit a high point with the Linux 3.6 kernel and that Ubuntu 12.10 is faster with Intel hardware compared to the current Ubuntu 12.04 LTS release. In this article are more Ubuntu 12.04 LTS vs. Ubuntu 12.10 benchmarks to highlight the performance improvements for Intel Sandy Bridge graphics that will be found in Ubuntu 12.10.
That's a nice improvement. Would some of that be due to the improvement in Unity and Compiz also?
On average 10% more power just by making the software better. That's cool.
If you consider that the SNB i5-2520m Michael is using is clocked 40% faster in kernel 3.5 (Ubuntu 12.10) than in kernel 3.2 (Ubuntu 12.04) the question becomes why are not the test results showing a consumerate gain?
Originally Posted by phoronix
Is that CPU clock, GPU clock, turbo differences, or all of the above?
Originally Posted by ickle
The render clock (GPU). Our initial render power management code had the oversight that we set the upper frequency to a fixed 900MHz, rather than the real value for the chip. In Michael's case, that is 1250MHz. You can check what speed your GPU is currently running at with /sys/kernel/debug/dri/0/i915_cur_delayinfo, and if we are sucessfully enabling low power idle states with /sys/kernel/debug/dri/0/i915_drpc_info.
Originally Posted by Veerappan
Ew, another interface under a *debug* option that should be available to all users.
Please consider moving it out of debugfs to any proper interface that's always there (proc, sys, ioctl, etc etc).