Should I use mod_perl 1.0 or mod_perl 2.0?
mod_perl 1.0, for use with Apache 1.0, is stable and well tested, while mod_perl 2.0, for use with Apache 2.0, is in a development stage. Normally, therefore, one would recommend mod_perl 2.0 only in a testing and development environment. However, on Win32 mod_perl 1.0 is subject to some serious threading limitations which are overcome with mod_perl 2.0; this, coupled with the improved performance of Apache 2.0 on Win32, may make mod_perl 2.0 a better choice.