And one more time...
I noticed that we were seeing a 3 to 4-fold slowdown on sv wiki history dumps in comparison with the previous run. After investigation it appears that this is due to use of XMLReader(). I've rolled that back and we are once again up. I've also restarted dawiki from the middle of its run. Once again, if people could get their eyes on dumps as soon as they complete, that would be greatly appreciated.
Ariel