Excelerator 2.3 has virtual memory management of filtering rating lists. This means that filtering can be installed on low-memory cache devices. (The minimum Excelerator RAM requirement is 256 MB.)
By default, Excelerator allocates ten percent of a cache device's RAM for use by filtering rating lists. On low-memory devices, portions of the rating lists often won't fit in RAM and are therefore swapped between RAM and the device's hard disks as required.
For most low-memory devices, the ten percent allocation is optimal. However, you can set the percentage of RAM used for rating lists to any value from 10 to 25 percent by entering the following command at the System Console prompt:
set filter memorypercent=percent
apply
where percent is a number from 10 to 25.
IMPORTANT: Memory that you allocate to filtering services can no longer be used for proxy services. Therefore, you should closely monitor proxy service performance to ensure your changes are properly balanced.
One scenario that might justify a memorypercent setting higher than 10 would be if you add RAM to your low-memory device without installing additional disk space. In this case, chances are good that the additional RAM normally allocated to proxy services would not be completely utilized by the services.