Tutorial to tune php-fpm

Hello people, i run my drupal 7 site on a VPS with 1GB of ram with a LAMP stack. I would like to switch to nginx and php-fpm because people keep saying that php-fpm saves a lot of memory compared to apache mod_php.

Unfortunately, the last time I tried, i did not have much success. I had the cpu overloaded, or soimetimes "page not found" for some pages pages, or max-children limit reached in logs.

To set up nginx i used this example http://wiki.nginx.org/Drupal and nginx itself worked, but I could not configure php-fpm well for my server, despite having read various tutorials here and there.

Any advice? Thanks