Re: Load balancing question

[Bj <bjkhanz@xxxxxxxxx>]

Your jk_status seems to be ok but :
 1) your perf mon tells that you are heavy loaded. If your cpu are hyperthread (HT) and if you have more than 50% of global cpu usage you can considere that you are not far from   your max. Your loadaverage shows that you have lot of (too much ?) processes to handle per cpu.
 2) how many simultaneous connections can handle your apache ? check your ThreadsPerChild.       Default is about 250 i think.
 3) Do you use keepalive in your worker ? It would reduce number of opened socket on your servers. 
worker.tomcat6.socket_keepalive=1

Did you try to load from your LAN ? Just to check if your internet link is the bottleneck.
You can also try to load only one tomcat on port 8080 to check how many requests per second it can handle.
Are your tomcats in cluster ? do you use session replication ?

If your webapp is not working well ,I suggest you to monitor it  (through jmx or in activating logs ). Look at old and young garbage collections (frequency and duration).

--  
Bj