BIND 9.6.1-P3 using more resources?

[Chris Thompson]

We upgraded our main recursive nameservers (validating, via dlv.isc.org)
from 9.6.1-P2 to 9.6.1-P3 a couple of days ago. CPU (and possibly memory)
consumption have been quite a bit larger since then, and more worryingly,
seems to be gradually increasing.

I have looked for a co-incidental change in the query pattern that might
explain this, without success so far. If anyone else has seen a similar
effect as a result of upgrading, please let me know.

-- 
Chris Thompson
Email: cet1 at cam.ac.uk