mod_perl interpreter pool

The Prefork MPM has the following settings:
<IfModule mpm_prefork_module>
        StartServers                     5
        MinSpareServers           5
        MaxSpareServers          10
        MaxRequestWorkers         150
        MaxConnectionsPerChild   0
</IfModule>

I see these Apache directives but the documentation states that they only
apply to a threaded mod_perl/Apache which prefork definitely is not:
PerlInterpStart
PerlInterpMax
PerlInterpMinSpare
PerlInterpMaxSpare
PerlInterpMaxRequests

How does mod_perl allocate interpreters to the prefork worker processes? Is
there one perl interpreter for each of preform worker? Is there a pool of
perl interpreters which is smaller than the pool of prefork workers? Are
there settings for configuring the size of the perl interpreter pool? When
a request comes in, does the user have to wait for a perl interpreter
process to start or is there already one waiting for them?

-- 
John Dunlap
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