I want to support 9000 byes jumbo frames and want to create clusters with 9000 byte buffers.

Is setting mclbytes to 9000 the right way to do this?

What value should pagesize be set to for optimum performance?

In the Core Networking Guide the jumbo frames example should both parameters set to 8192 to support a jumbo MTU of 8100 
but does not explain the significance of the pagesize value or its relationship to mclbytes.