Reiser4 performance dropped in the -mm series due to the write
throttling patch and also dropped due to a fixed bug (removing type safe
lists added a bug).  We don't yet know if we got quite all the
performance back, we are still testing.  Conservative users should wait
a week or two to see if bug reports with reiser4 remain, or if indeed we
did get all the bugs out  of the recent cleanup patch. 

Hans