There are special considerations when using FRCA on AIX platforms.
The FRCA kernel extension must load before starting IBM HTTP
Server with FRCA enabled. Also, increasing the upper-bound limit of the percentage
of CPU time that the FRCA kernel extension can spend in the interrupt (high
priority) context is not recommended.
The following items must be considered when you use fast response cache
accelerator (FRCA) on AIX platforms:
- The FRCA kernel extension must load before starting IBM HTTP server with
FRCA enabled. To do this, issue the frcactrl load command. This is
normally configured to run whenever the system boots and before IBM HTTP Server
starts. See the AIX man pages for more details about the frcactrl command.
- In order to place an upper bound on the percentage of CPU time that the
FRCA kernel extension can spend in its interrupt (high priority) context,
use the frcactrl pctonintr command. Increasing this above the
default value of 80% is not recommended in order to allow other applications
a reasonable amount of time to execute. Decrease this value if more time needs
to be allocated to other applications, but note that reducing the value will
result in more cache misses, even if a file is in the cache.
- You can find a sample AIX configuration in the httpd.conf.sample.afpa file,
which is located in the conf directory of the IBM HTTP Server installation.