Hi,
Both the 6500 and 6800 support service policy in input direction.
This link say it is supported in output direction if you have PFC3, but I have seen the same thing with the 6800 series.
At this point, the QoS policy defined in the policy map still has not taken effect. After you configure a policy map, you must apply it to an interface for it to affect traffic. You use the service-policy command to apply the policy map. Remember that an input service policy can be applied to either a port or to VLAN interfaces, but that an output service policy can only be applied to VLAN interfaces (only the PFC3 supports output policies). In this example, you apply the policy as an input service-policy to each interface that has a PC and IP phone attached. This example uses port-based QoS, which is the default for Ethernet ports.
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/qos.html#wp1727221
HTH
