Phoronix has an update on the performance of Intel's Sandy Bridge in Linux, you can read it over here.
"At the beginning of the month I reported on a small patch to
Mesa that resulted in a huge performance improvement for Intel Sandy
Bridge graphics, but Intel's OSTC developers have bumped up the
performance of the latest-generation graphics processors even more. With
the LLC caching patch-set, which should be committed to the Linux 2.6.40
kernel (not the current 2.6.39 cycle), there are measurable OpenGL