How to disable or kill rpciod kernel thread on Red Hat Enterprise Linux ?

Issue

• What is the use of rpciod kernel thread ?
• How to disable rpciod kernel thread ?
• Why I am unable to kill rpciod process(es) using kill command ?
  Eg:

# ps Haxwwo pid,command | grep "rpciod" | grep -v grep
 2649 [rpciod/0]
 2650 [rpciod/1]
 2651 [rpciod/2]
 2652 [rpciod/3]

# kill -9 2649

# ps Haxwwo pid,command | grep "rpciod" | grep -v grep
 2649 [rpciod/0]
 2650 [rpciod/1]
 2651 [rpciod/2]
 2652 [rpciod/3]

• Why ps command is showing rpciod process(es) even though nfs and rpc related packages are not installed on the system ?
  Eg:

# rpm -qa|egrep "rpc|nfs|port"

# ps Haxwwo pid,command | grep "rpciod" | grep -v grep
 4073 [rpciod/0]
 4074 [rpciod/1]