Nginx 1.6 under load gives a ton of error 403

[dfumagalli]

For future reference:
empyrical observation seems to show that 1.6 is a bit heavier than 1.4.7.
I have raised some php-fpm.conf daemon settings and timeouts and the
situation improved:

emergency_restart_threshold = 10
emergency_restart_interval = 1m
process_control_timeout = 10s

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,249857,249927#msg-249927