config_opts['plugin_conf']['tmpfs_enable'] = True
config_opts['plugin_conf']['tmpfs_opts'] = {}
config_opts['plugin_conf']['tmpfs_opts']['required_ram_mb'] = 2048
config_opts['plugin_conf']['tmpfs_opts']['max_fs_size'] = '6g'
config_opts['plugin_conf']['tmpfs_opts']['mode'] = '0755'
config_opts['plugin_conf']['tmpfs_opts']['keep_mounted'] = True

config_opts['plugin_conf']['tmpfs_enable'] = True
config_opts['plugin_conf']['tmpfs_opts'] = {}
config_opts['plugin_conf']['tmpfs_opts']['required_ram_mb'] = 2048
config_opts['plugin_conf']['tmpfs_opts']['max_fs_size'] = '4g'
config_opts['plugin_conf']['tmpfs_opts']['mode'] = '0755'
config_opts['plugin_conf']['tmpfs_opts']['keep_mounted'] = True

Set tmpfs size to 4GB
Set tmpfs size to 4GB

The current instance at ci.centos.org might suffer memory pressure
if all 6 workers use a 6GB tmpfs at once, so let's reduce it and
see the result.
