http - Apache prefork module. Processes not being forked under heavy load

I have an apache prefork module http server running on
linux machine. The machine has 8GB RAM. I have following in my
/etc/httpd/conf/httpd.conf:

            prefork.c>
 StartServers 8
 MinSpareServers 5

            MaxSpareServers 20

 ServerLimit 512
 MaxClients
            512
 MaxRequestsPerChild
            4000

The
problem is that no more child processes are getting forked after 256 and the requests
are getting queued. I can see the number of child processes stuck at 256 under heavy
load.

The average memory of a httpd process is
aboout 3.69 MB.

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