what is the best setting for using lighttpd on 8G ram?

Question

I have running 8GB ram and 8 x Xeon 3361 system! What is the best setting for running simultaneous connection! What is the maximum? Is setting like this correct?

server.max-keep-alive-requests = 0
server.max-keep-alive-idle = 10
server.max-read-idle = 60
server.max-write-idle = 60

server.event-handler = "linux-sysepoll" 
server.max-fds = 2048
fastcgi.server             = ( ".php" =>
                               ( "localhost" =>
                                 (
                                   "socket" => "/tmp/php-fastcgi.socket",
                                   "bin-path" => "/usr/bin/php-cgi",
                                   "max-procs" => 20,
                                   "bin-environment" => (
                                     "PHP_FCGI_CHILDREN" => "40",
                                     "PHP_FCGI_MAX_REQUESTS" => "800" 
                                   ),
                                   "broken-scriptfilename" => "enable" 
                                 )
                               )
                            )

please help me!