[Pdns-users] MySql and Pdns high cpu utilization

[Romeo]

I have pdns with gmysql. pdns version is 2.9.14 patched for problem of 
master-slave transfer zone. 400 zone insert into powerdns.

This is a shot of my top:
Swap: 2040212K av, 1746860K used,  293352K free                  438028K cached

   PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME COMMAND
   993 mysql     15   0 32152  14M  2612 S    64.0  1.4  33:21 mysqld
  5731 root      17   0  2204 2204  1448 S    44.9  0.2   0:04 pdns_server

The hardware is a double xeon with 1gb ram, redhat 8.0, raid5, so no 
problem of cpu, but mysqld and pdns_server are always on respectively 60% 
and 40% of one cpu.
Sorry if it is a known problem, but I lost mailbox of mailing list.
My log are quite usual, no error.
I tryed to restart both mysql and pdns with any changes...

Any idea to solve it? What is the last version fully working with gmysql 
backend?
How can i get more information on the cause of cpu utilization?

Thanks
Romeo