Can you try the patch here http://www.ussg.iu.edu/hypermail/linux/kernel/0809.1/2074.htmlOnly talking about .27 and just making sure again the issue is known.Haven't been subcribed to any lists recently and someone was talking about "the other thread" before but just noticed that an-rc6 was cut.here's what is pending in tip/x86/pat for v2.6.28:
Please note that the shutdown issue remains unfixed in it (I'm doing my coalescing changes locally).
The above mentioned subject for the entry cache one ("fix Xorg startup/shutdown slowdown with PAT") after all mistakingly says it does something for shutdown.
That should resolve both reserve and free issues..