High CPU when tranferring data between VLANs on the same subinterface

Question

Hi 
i have Cisco 2821 with 2 subinterfaces on the G0/0, with 2 different VLANs on them.
When i copy about 60 Mb/s between them, the CPU usage increase to 80-90 %, and start to drop the packets.
The CEF is on on all those subinterfaces.
Any recommendations ? 
many thanks
Here is the info about those subinterfaces:
#sh cef interface g0/0.10
GigabitEthernet0/0.10 is up (if_number 5)
  Corresponding hwidb fast_if_number 21
  Corresponding hwidb firstsw->if_number 2
  ICMP redirects are always sent
  Per packet load-sharing is disabled
  IP unicast RPF check is disabled
  Input features: Stateful Inspection, Virtual Fragment Reassembly, Virtual Fragment Reassembly After
  Output features: Stateful Inspection, TCP Adjust MSS
  IP policy routing is disabled
  BGP based policy accounting on input is disabled
  BGP based policy accounting on output is disabled
  Hardware idb is GigabitEthernet0/0
  Fast switching type 1, interface type 27
  IP CEF switching enabled
  IP CEF switching turbo vector
  IP prefix lookup IPv4 mtrie 8-8-8-8 optimized
  Input fast flags 0x400061, Output fast flags 0x10181
  ifindex 2(2)
  Slot  Slot unit 0 VC -1
  IP MTU 1500
#sh cef interface g0/0.117
GigabitEthernet0/0.117 is up (if_number 21)
  Corresponding hwidb fast_if_number 5
  Corresponding hwidb firstsw->if_number 2
  ICMP redirects are always sent
  Per packet load-sharing is disabled
  IP unicast RPF check is disabled
  Input features: Stateful Inspection, Virtual Fragment Reassembly, Virtual Fragment Reassembly After
  Output features: Stateful Inspection
  IP policy routing is disabled
  BGP based policy accounting on input is disabled
  BGP based policy accounting on output is disabled
  Hardware idb is GigabitEthernet0/0
  Fast switching type 1, interface type 27
  IP CEF switching enabled
  IP CEF switching turbo vector
  IP prefix lookup IPv4 mtrie 8-8-8-8 optimized
  Input fast flags 0x400061, Output fast flags 0x10181
  ifindex 2(2)
  Slot  Slot unit 0 VC -1
  IP MTU 1500
sh int g0/0 st
GigabitEthernet0/0
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor   13584490  436643191   27043759 2436202283
             Route cache   70111252 1482061430   60433310  610254739
                   Total   83695742 1918704621   87477069 3046457022

Answer 1

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Posting
Recommendation?  Yes, you may need a faster router.  At 60 Mbps, you might be bumping into the capacity limitations of the 2821.