Configuringrate-limit with empty policy-mapshould result in bandwidth allocation equal to interface bandwidth, achievingline rate.
In earlier releases this was not happening and empty policy map was allocating bandwidth randomly at about 10%. The issue is fixed 5.6, 5.7e, 5.8c and 5.9 with TR000562804Here are the configuration details:
access-list 184 permit ip any any
policy-map RL-NOLIMIT (The policy-map is configured but no CIR values are defined)
interface ethernet 1/1
rate-limit input access-group 184 policy-map rl-nolimit