Re: NFSv4 and the RPC svcgssd-service
"rpcsvrgssd" is the name of the service.
You need it if you are using a gssapi type of authentication (typically Kerberos_ for NFS. Otherwise you don't.
Stop it in and disable it in the system-config-services tool.
A national political campaign is better than the best circus ever heard of, with a mass baptism and a couple of hangings thrown in. H. L. Mencken