First, Access Gateway/SPS has an Apache and Tomcat modules. The following technote will give you indications about the parameters you can tune for:
Apache Tomcat connector
Httpclient Connection Pool
CA Access Gateway (Secure Proxy Server): Commonly Tuned Parameters
You will be able to get the best values by "benchmarking" in your Test or QA environment and put load on it.
More, the section "Operating System Tuning" mentions the following:
Sometimes Linux operating environments require tuning the shared memory
segments. For more information about the shared memory segments and how
to tune them, see the documentation for your particular operating environment.
Operating System tuning for Agents
That means that often out of the box configuration is already enough for shared memory on Linux, which is not the case with SunOS systems. That is the reason why you see only values for SunOS.
Looking also in a RedHat 6 64bit system, by default have seen the following values :
which are greater than the ones recommended for SunOS. You will find more documentation about RedHat Operating System here :
RedHat Documentation - Performance tuning and shared memory
Additional Information :
SPS - Configure the Apache settings manually
SPS - Configure the proxy service settings manually
SPS - Configure the Tomcat settings manually
Note that 'MaxClients' has been renamed to 'MaxRequestWorkers' in Apache 2.4.x (bundled with Access Gateway 12.7)