If you are planning to push large mirrored projects to GitSwarm, we recommend that you use SSH. If you encounter failures due to large pushes, or are only able to use HTTP/S, the following changes made to /etc/gitswarm/gitswarm.rb may be of help:
nginx['client_max_body_size'] = '0m'
nginx['proxy_read_timeout'] = 1000
nginx['proxy_connect_timeout'] = 1000