Exempt rate

RouterOS Beginner Basics
1

i have configured thundercache and mikrotik as pppoe server its working 100%but the problem is
How to exempt rate limit for thunder cache
let me explain…
when user connects via pppoe server, dynamic queue is created for that user according to his package, lets say 512k, now the problem is this restriction also embose on thunder cache, and we dont want to limit speed for Thunder cache.
plzz help…
and
sorry for bad english…
here is mangle rule for thunder cache

chain=prerouting action=mark-routing new-routing-mark=thunder_route 
     passthrough=no protocol=tcp src-address=192.168.3.0/24 
     in-interface=!INTERNAL dst-port=80

and here is route for thunder cache

#        DST-ADDRESS        PREF-SRC        GATEWAY-STATE  GATEWAY                DISTANCE  INTERFACE 
1  A S  0.0.0.0/0                                    reachable            10.10.0.100             1              thunder
2

http://wiki.mikrotik.com/wiki/PCQ_and_Hotspots,_and_exempting_upstream_resources_from_rate_limit

the same techniques work for exempting PPPoE users from resource access.