"This is the largest performance improvement to hit the RT patch since the removal of the global PI lock. On my 4way box running 'hackbench 50' went from 18 seconds down to just under 5 seconds (4.8). Vanilla 2.6.24.7 on this same box runs at 3.9 secs. This is the first time that the RT patched kernel is less than a magnitude away from mainline running this hackbench test."