CentOS6
From Leaky
Adjust rate-limiting for rsyslog
These instructions are for rsyslog 5.8.10 that comes with CentOS 6
/etc/rsyslog.conf
# Disable rate-limiting completely $SystemLogRateLimitInterval 0
or
# Set the rate limiting to 500 messages in 5s $SystemLogRateLimitInterval 5 $SystemLogRateLimitBurst 500