Extremely slow LXR indexing with mysql after last update

[Gene Smith]

Don't see any errors but indexing a fairly large set of LXR versions of 
various programs with genxref program now taking extreme time. 
Previously only took a few minutes to zip though lots of projects/versions.

See alternating 100% cpu on cores and what looks like constant disk 
usage and processing now just crawls. Still on 1st project after about 
an hour (previously took maybe a minute per project).

Top and system monitor don't show extreme processing on mysqld or 
genxref or any other process (except cores usages rotates and remains
100%).

Recent f16 update included mysqld I think, so my guess is something has 
change or broken with it.

No errors reported in /var/log/messages or /var/log/mysql.log

-gene