On page 5-10 of the Cisco Telepresence Network Systems 2.0 Design Guide it states:
"The C3560G/3750G/E supports either 4Q3T or 1P3Q3T egress queueing configurations...it is recommended to enable 1P3Q3T egress queueing configuration, with Q1 as the PQ."
In my C3750G I do a 'show int g1/0/7 capabilities' and get this output concerning the queues:
QoS scheduling: rx-(not configurable on per port basis),
tx-(4q3t) (3t: Two configurable values and one fixed.)
The switch is running 12.2(58)SE2
How does one change the queue structure from 4Q3T to 1P3Q3T?
You can take a look at this document:
Hope this helps, please rate if it does.