mod_perl Filters: Selecting the most appropriate buffer size

Hi All,

I am going through the documentation on mod_perl filters at the link below:

http://perl.apache.org/docs/2.0/user/handlers/filters.html


Examples set a buffer size to process the content held in the buffer like:

use constant BUFF_LEN => 1024;

What is the best approach to reach most optimum buffer size? Is there a best practices like guideline here?

Thanks,
Rommel.