High CPU Utilization in 7603 router with RSP720-10GE

Hi everyone
We have a 7603 router with "RSP720-10GE" and we have high cpu utilization due to high amount of interrupts.
The output of “show cef drop” and “show ip cef switching statistics” commands show lots of packets that have been dropped by CEF.
But CEF is enabled on every physical interfaces and on every GRE tunnel that we have on this router.
As I understand the output of “show ip cef switching statistics” command shows some of the reasons for CEF dropping packets like “Routed to Null0” but I don’t know how to solve them. For example I can’t delete routes to Null0 because it’s going to cause routing loops in our network. Could you please help me

Hey,
The output shows high interrupt to CPU, So collect the last output multiple times to see if the DROP values are incrementing. Also configure NetDr captures to see what packets are punted to CPU. I am adding a link for same:
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/116475-technote-product-00.html
HTH.
Regards,
RS

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    why our interrupt rate is high ,and one thing more the total sum of 5sec in separate rows not equal to cpu utilization for five second 50% 
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      13   374006320  3155162661          0  0.23%  0.26%  0.24%   0 ARP Input
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    static          1           120         0           7620        20812
    connected       0           313         0           18860       53836
    ospf 98         17          4892        0           589020      863984
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      NSSA External-1: 0 NSSA External-2: 4437
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      External: 1 Internal: 0 Local: 0
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      NSSA External-1: 0 NSSA External-2: 0
    internal        137                                             260544
    Total           155         5595        0           631780      1246692
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      1    0  4-subslot SPA Interface Processor-200  7600-SIP-200       
      2    0  4-subslot SPA Interface Processor-400  7600-SIP-400       
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      8    2  Route Switch Processor 720 (Cold)      RSP720-3CXL-GE     
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    1 Ten Gigabit Ethernet interface
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            5 minute tx rate 47394000 bits/sec, 60212 packets/sec
            19879272237 packets input, 4006174536193 bytes
            19835355282 broadcasts received
            19808585787 packets output, 3981305571968 bytes
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            19756362091 Packets CEF Switched, 1320184 Packets Fast Switched
            0 Packets SLB Switched, 0 Packets CWAN Switched
            Label switched pkts dropped: 0    Pkts dropped during dma: 339549
            Invalid pkts dropped: 0    Pkts dropped(not cwan consumed): 0
            IPSEC pkts dropped: 635184
            Xconnect pkts processed: 0, dropped: 0
            Xconnect pkt reflection drops: 0
            Total paks copied for process level 0
            Total short paks sent in route cache 2605317676
            Total throttle drops 265338    Input queue drops 5831090
            total spd packets classified (120217214 low, 174503 medium, 3073 high)
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            spd prio pkts allowed in due to selective throttling (0 med, 0 high)
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       Rx Resource Errors    = 0            Input Drops           = 2488435
       Input Errors           = 194243
       Output Drops          = 0            Giants/Runts          = 0/0
       Dma Mem Error         = 0            Input Overrun         = 0
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            5 minute rx rate 20194000 bits/sec, 30412 packets/sec
            5 minute tx rate 47753000 bits/sec, 60663 packets/sec
            19891125514 packets input, 4007158118761 bytes
            19847185365 broadcasts received
            19820407164 packets output, 3982279276274 bytes
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            19768178233 Packets CEF Switched, 1321008 Packets Fast Switched
            0 Packets SLB Switched, 0 Packets CWAN Switched
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            Invalid pkts dropped: 0    Pkts dropped(not cwan consumed): 0
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            Total short paks sent in route cache 2606549061
            Total throttle drops 265338    Input queue drops 5831090
            total spd packets classified (120252754 low, 174531 medium, 3074 high)
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            spd prio pkts allowed in due to selective throttling (0 med, 0 high)
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      Rx(1)   3461063605      176652699
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     Rx1 0      0      0      3633   0        0    0
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    Hi all,
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    --

    Thanks ak, for the response.
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    if (log.isTraceEnabled()) log.trace("Attempting retrieval: " + i);
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    break;
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    jmsMessage = (BytesMessage) consumer.receive(timeout);
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    if (jmsMessage != null) {
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    ***Ratings Encourages Contributors ***

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    Gilles,
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    On standby CSS,
    fmPeerMsgTas 8a511510 50 16% ( 176) 10% ( 7)
    Your comment would be greatly appreciated.
    Best regards,

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