Processing Load Percentage = 100

Hello,
Guys I have been working with 3 IPS 2 4260 and a 4270 since yesterday I have noticed that the Inspection LOAD is RED. On the 4260 the inspection load is.
SJDetec1# sh statistics virtual-sensor | inc Load
         Processing Load Percentage = 99
On the 4270!!!!!!!
DCDetect1# sh statistics virtual-sensor | inc Load
         Processing Load Percentage = 100
DCDetect1# sh statistics analysis-engine
Analysis Engine Statistics
   Number of seconds since service started = 174759
   The rate of TCP connections tracked per second = 0
   The rate of packets per second = 4711
   The rate of bytes per second = 8402
   Receiver Statistics
      Total number of packets processed since reset = 823334516
      Total number of IP packets processed since reset = 822979042
   Transmitter Statistics
      Total number of packets transmitted = 823478816
      Total number of packets denied = 0
      Total number of packets reset = 0
   Fragment Reassembly Unit Statistics
      Number of fragments currently in FRU = 0
      Number of datagrams currently in FRU = 0
   TCP Stream Reassembly Unit Statistics
      TCP streams currently in the embryonic state = 0
      TCP streams currently in the established state = 0
      TCP streams currently in the closing state = 0
      TCP streams currently in the system = 0
      TCP Packets currently queued for reassembly = 0
   The Signature Database Statistics.
      Total nodes active = 16115
      TCP nodes keyed on both IP addresses and both ports = 3438
      UDP nodes keyed on both IP addresses and both ports = 29
      IP nodes keyed on both IP addresses = 1715
   Statistics for Signature Events
      Number of SigEvents since reset = 153308490
For example in the 4270 we are passing almost nothing through the sensor... ANd its working in promiscuos mode. Why is the Inspection Load that High? In the 4260 is the same.. It is working in promiscuos mode.. There are alarms for missed packets as well.
I have been seeing several Discutions for the same reason but none has a fix. The Issue with the inspection load is random. DUring the day sometimes it high and sometimes is low.
Cisco Intrusion Prevention System, Version 7.0(2)E4
Signature Update    S499.0
Any advice will be really appreciated.
Diego.

Diego,
What is your traffic profile? Can you provide packet captures during a time of high processing load along with a show tech? What changed in your network when the issue started?
You are seeing quite a few signature events:
Analysis Engine Statistics
   Number of seconds since service started = 174759
   Statistics for Signature Events
      Number of SigEvents since reset = 153308490
From the limited amount of information we have, it appears that you may be experiencing traffic spikes throughout the day that lead to many events firing which cause the IPS to become oversubscribed. There is quite a bit of data that we will need to examine to validate this. Please open a TAC case and we can begin to investigate.
Thank you,
Blayne Dreier
Cisco TAC IDS Team**Please check out our Podcast**
TAC Security Show: http://www.cisco.com/go/tacsecuritypodcast

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