One item not provided by this patch that we would really love to see -- and will just become more important with these clocking improvements -- would be exporting the clock and voltage information to a sysfs interface.
This patch is also a prerequisite for Intelligent Power Sharing (IPS), which is another hardware feature found on the new Core i3/i5 Clarkdale/Arrandale processors. Intel's Intelligent Power Sharing is described as "a driver-based power management mechanism that provides intelligent power sharing across cores. With these capabilities, performance for the processor and graphics processor can be scaled up or down, depending on system activity and thermal tolerances. The result: stellar performance and prudent power use."
No Intelligent Power Sharing patch has yet to be published for the Intel Linux driver, but it's being worked on and is expected to arrive soon. Jesse Barnes confirmed this in a new blog post where he also shares this new work is increasing the graphics performance by about 15%.
In Jesse's blog post he also comments on the new DRI2 swap events (Mutter/Clutter Work Leads To New GLX Extension) and other sync and swap improvements.