svn log can be used to show the log messages for a set of revision(s) and/or path(s). Here are some ways to do svn log of entire repository
Svn log of entire repository using remote repo url
$ svn log http://svnserver.com/repo_url // or $ svn log svn://svnserver.com/repo_url
Svn log of entire repository using -r option
$ svn log -r HEAD:1
Svn log in root directory
Go to the svn root directory and run svn log after update
$ cs local_root_dir $ svn update $ svn log