In order to import a revision of a CVS module, I am using:
/usr/lib/git-core/git-cvsimport -a -i -p r,revisionname -k -v -d :pserver:user@xxx.com:2401/srv/cv
From http://git-scm.com/docs/git-cvsimport
WARNING: git cvsimport uses cvsps version 2, which is considered deprecated; it does not work with cvsps version 3 and later. If you are performing a one-shot import of a CVS repository consider using cvs2git or parsecvs.
Check if you have a cvsps version 3 or later
$ cvsps --version
If you can downgrade it to cvsps version 2 you are done.
Main difference is cvs2git is not incremental (except using this workaround), so it's targeted to one-shot checkout. With cvsimport you can do incremental updates, and stay up to date to cvs repo.