Apache 2.4 default values MPM event
===================================

<IfModule mpm_event_module>
    StartServers             3
    MinSpareThreads         75
    MaxSpareThreads        250
    ThreadsPerChild         25
    MaxRequestWorkers      400
    MaxConnectionsPerChild   0
</IfModule>


ServerLimit = MaxRequestWorkers / ThreadsPerChild

MaxRequestWorkers = 400
ThreadsPerChild   = 25
   => ServerLimit = 16 (apache 2.4 default)

simultanous connections = ThreadsPerChild * ServerLimit = MaxRequestWorkers
   => simultanous Connection = 400

(ND Server)
==========

## - MaxConnectionsPerChild
## -
## - We want every httpd prozess to restart aproximately once a day
## -
Set MaxConnectionsPerChild = (requests/per day)/ServerLimit
requests / day ~  1.600.000
/ServerLimit   = 16
   => MaxConnectionsPerChild = 1600000/16 = 100000 = 100.000