It seems that in 6.3.3 are new OID for CPU/MEM usage.
ghost n9000 # snmpbulkwalk -c XXXXX -v 2c -t 10 -r 3 XXXXX system SNMPv2-MIB::sysDescr.0 = STRING: Cisco IOS XR Software (Cisco ASR9K Series), Version 6.3.3[Default]
Copyright (c) 2018 by Cisco Systems, Inc.
SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-SMI::enterprises.9.1.2390
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (40290) 0:06:42.90
SNMPv2-MIB::sysContact.0 = STRING: XXXXX
SNMPv2-MIB::sysName.0 = STRING: XXXXX
SNMPv2-MIB::sysLocation.0 = STRING: XXXXX
SNMPv2-MIB::sysServices.0 = INTEGER: 78
ghost n9000 # snmpbulkwalk -c XXXXX-v 2c -t 10 -r 3 XXXXX 1.3.6.1.2.1.47.1.1.1.1.7 | grep "module 0/"
SNMPv2-SMI::mib-2.47.1.1.1.1.7.15176092 = STRING: "module 0/6/1"
SNMPv2-SMI::mib-2.47.1.1.1.1.7.28927172 = STRING: "module 0/0/CPU0"
SNMPv2-SMI::mib-2.47.1.1.1.1.7.29992163 = STRING: "module 0/7/1"
SNMPv2-SMI::mib-2.47.1.1.1.1.7.36731525 = STRING: "module 0/RSP1/CPU0"
SNMPv2-SMI::mib-2.47.1.1.1.1.7.37425837 = STRING: "module 0/7/CPU0"
SNMPv2-SMI::mib-2.47.1.1.1.1.7.38645760 = STRING: "module 0/RSP0/CPU0"
SNMPv2-SMI::mib-2.47.1.1.1.1.7.49175796 = STRING: "module 0/6/CPU0"
ghost # snmpbulkwalk -c XXXXX -v 2c -t 10 -r 3 XXXXX 1.3.6.1.4.1.9.9.109.1.1.1.1.2
SNMPv2-SMI::enterprises.9.9.109.1.1.1.1.2 = No Such Instance currently exists at this OID
Same OID on 6.2.3 these OID's works perfect.
