Incorrect bandwidth numbers by CPanel and Ensim!

2025-04-01

With GZIP compression on (either mod_gzip or php ob_gzhandler), I have reason to believe that CPanel and Ensim are not reporting true bandwidth usage. Instead, they are reporting total bytes being sent BEFORE compression. This is just not right.

In both cases below, there is NO subdomain usage, NO e-mail usage, and barely any FTP usage (a couple megabytes per month the most vs. the gigabytes used by HTTP).

With mod_gzip on:
Webalizer: 3GB CPanel: 11GB
(3-4x difference!!)

With mod_gzip off and PHP Gzip compression on (only for message board):
Webalizer: 7GB Ensim: 18GB
(2-3x difference!!)

FHDave:

I found out that with mod_gzip enabled, CPanel bandwith calculation can be off by a factor of 3 from webalizer. But with mod_gzip off, this does not seem to be a big factor anymore (within few percent or so as I recall).