Is ServerLimit 256 in prefork mode somehow hardcoded?

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I am using Apache on RHEL 7 since along time.
httpd-2.4.6-97.el7_9.x86_64

I use it with mod_mpm_prefork module, the default on Redhat.

I see, shortly after startup, messages in errorlog like
AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting

I have tried to do that
<IfModule mpm_prefork_module>
    StartServers          20
    MinSpareServers       10
    MaxSpareServers       20
    ServerLimit           512
    MaxRequestWorkers     512
    MaxConnectionsPerChild  10000
</IfModule>

I also tried much higher values of ServerLimit and MaxRequestWorkers, like 6400 or 30'000

It makes no difference, the error message appears.

In server-status, I always see four lines of 64 servers, i.e. a total of 256 servers shown, like this:

.R_RRRRR_RRRRRKCCC_C..R_RRRKRRCC.R_CCKRKRRRRRKC.KRKR_R.__RKCRRRK
.KKRWRC_R_RCRRCKR_KRKKRRKKKKRKRC.C_RRRKR_RRRRC.K................
................................................................
................................................................

How can I get beyond these 256 servers?

The machine has 64 cores, and 132 Gb RAM.

I know that I can switch to mod_mpm_event, but before I go that way, I would like to know why I cannot more than 256 servers in prefork mode.


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