During heavy load of about 100 concurrent calls the CPU on one of our servers spikes to 100%. Running Top we see that Mysqld is 100%. This is probably due to at least two things we can think of: Mysql CDR addon and at the end of each call, during hangup, we insert a record into another DB using an AGI script. The AGI script opens a new connection to Mysql, inserts one row and disconnects. We are using mysql_pconnect and it looks like the CDR is also using pconnect, so persistent connections are being used in both cases. Not sure where else to look. Any ideas?