Is anyone familiar with these? Is the setup below optimized enough? And what exactly the parameters mean if you know

eAccelerator
Caching Enabled true
Optimizer Enabled true
Cached Scripts 186
Removed Scripts 0
Cached Keys 0
eaccelerator.compress 1
eaccelerator.compress_level 9
Zend Optimizer
Optimization Pass 1 enabled
Optimization Pass 2 enabled
Optimization Pass 3 enabled
Optimization Pass 4 enabled
Optimization Pass 9 enabled
It's for PHP 5.2.