High CPU Utlization

Kaushik Ray · ‎08-17-2015

Hello I am using the following router and IOS version

sh inv
NAME: "CISCO3925-CHASSIS", DESCR: "CISCO3925-CHASSIS"
PID: CISCO3925-CHASSIS

"flash:c3900-universalk9-mz.SPA.154-1.T1.bin"

I am seeing high amount of utilization on the router which is as below.

11:45:46 AM Monday Aug 17 2015 UTC

      999999999999999999999999999999999999999999999999999999999999
      111100000111112222211111111113333311111000000000000000000000
100
   90 ************************************************************
   80 ************************************************************
   70 ************************************************************
   60 ************************************************************
   50 ************************************************************
   40 ************************************************************
   30 ************************************************************
   20 ************************************************************
   10 ************************************************************
     0....5....1....1....2....2....3....3....4....4....5....5....6
               0    5    0    5    0    5    0    5    0    5    0
               CPU% per second (last 60 seconds)

      999999999999999999999999999999999999999999999999999999999999
      742222221222334233232433233232223233223322222221222223213233
100 *
   90 ############################################################
   80 ############################################################
   70 ############################################################
   60 ############################################################
   50 ############################################################
   40 ############################################################
   30 ############################################################
   20 ############################################################
   10 ############################################################
     0....5....1....1....2....2....3....3....4....4....5....5....6
               0    5    0    5    0    5    0    5    0    5    0
               CPU% per minute (last 60 minutes)
              * = maximum CPU%   # = average CPU%

       1
      909999999999999999999999999999999999999999999999999999999999999999999999
      408444444433344444444434344444434434444344344443444444345444344334334444
100 **                                                     *
   90 ########################################################################
   80 ########################################################################
   70 ########################################################################
   60 ########################################################################
   50 ########################################################################
   40 ########################################################################
   30 ########################################################################
   20 ########################################################################
   10 ########################################################################
     0....5....1....1....2....2....3....3....4....4....5....5....6....6....7..
               0    5    0    5    0    5    0    5    0    5    0    5    0
                   CPU% per hour (last 72 hours)
                  * = maximum CPU%   # = average CPU%

The traffic on the device is not much expecially with the type of router it is.

5 minute input rate 483000 bits/sec, 176 packets/sec
5 minute output rate 146000 bits/sec, 164 packets/sec

Seeing lots of Check Heaps. any way to find out what may be causing this and how to get it fixed? or if there is a know bug with this IOS version?

CPU utilization for five seconds: 90%/90%; one minute: 91%; five minutes: 91%
PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process
   6    15873688      980875      16183 0.00% 0.25% 0.23%   0 Check heaps
198       41968   281502523          0 0.15% 0.20% 0.21%   0 Ethernet Msec Ti
   2     1298340      448325       2895 0.15% 0.20% 0.20%   0 Load Meter
90      183260     2250111         81 0.07% 0.07% 0.07%   0 Per-Second Jobs
126     1947712     4473488        435 0.07% 0.05% 0.07%   0 BPSM stat Proces
384     3769092      405286       9299 0.15% 0.05% 0.05%   0 Tag Control
185       65744    32368619          2 0.07% 0.05% 0.05%   0 PPP manager
13     6906584       37247     185431 0.00% 0.04% 0.05%   0 Licensing Auto U
303       61696    34848816          1 0.07% 0.03% 0.02%   0 MMA DP TIMER
377     2609004      233381      11179 0.00% 0.03% 0.05%   0 MFI LFD Stats Pr
296       61220    34848696          1 0.07% 0.03% 0.02%   0 MMA DB TIMER
177     1349428     5043005        267 0.07% 0.03% 0.00%   0 IP Input
132       61572    34848748          1 0.00% 0.03% 0.01%   0 VRRS Main thread
173       37164    69144059          0 0.07% 0.02% 0.02%   0 IPAM Manager
109       88788     8944533          9 0.00% 0.02% 0.01%   0 Netclock Backgro
368       40664    22272880          1 0.00% 0.01% 0.00%   0 PMIPV6 Thread
400      931876     2565852        363 0.07% 0.01% 0.00%   0 OSPF-1 Router
417       10176         789      12897 0.00% 0.01% 0.00% 644 Virtual Exec
89     2349148       87313      26904 0.00% 0.01% 0.00%   0 Per-minute Jobs
214      152676     2234524         68 0.00% 0.01% 0.00%   0 ADJ background
408        7640     5162619          1 0.00% 0.01% 0.00%   0 FR Broadcast Out
117     1937100       47173      41063 0.00% 0.01% 0.00%   0 BGP Scanner
308       86920    32445212          2 0.00% 0.01% 0.00%   0 PPP Events
383      169916     2238047         75 0.00% 0.00% 0.00%   0 TDP Hello
16     2477088     2233829       1108 0.00% 0.00% 0.00%   0 Environmental mo
376        4344     2233841          1 0.00% 0.00% 0.00%   0 mLDP Process
263      463648      223574       2073 0.00% 0.00% 0.00%   0 QoS stats proces
190       10268     8742314          1 0.00% 0.00% 0.00%   0 SSS Feature Time
33      300704     3627444         82 0.00% 0.00% 0.00%   0 ARP Input
363        1516     2236819          0 0.00% 0.00% 0.00%   0 fnvRootHubPortSt
366      138088      137206       1006 0.00% 0.00% 0.00%   0 mdns Timer Proce
197        6568    13965313          0 0.00% 0.00% 0.00%   0 Ethernet Timer C
402      204644     1834637        111 0.00% 0.00% 0.00%   0 OSPF-1 Hello
57      148556      362742        409 0.00% 0.00% 0.00%   0 Net Background
60       12168     2233826          5 0.00% 0.00% 0.00%   0 TTY Background
88       19892      449901         44 0.00% 0.00% 0.00%   0 Compute load avg
37           0           1          0 0.00% 0.00% 0.00%   0 CEF MIB API
36           0           1          0 0.00% 0.00% 0.00%   0 ATM ASYNC PROC

sh run | include cef
ip cef
ipv6 cef

ip cef is already enabled.

Reza Sharifi · ‎08-17-2015

Hi,

I think, for this you should open a ticket with TAC and send them the outputs as your CPU is running very high. They probably recommend an upgrade.

HTH

Joseph W. Doherty · ‎08-17-2015

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Posting

For just (about) 500 Kbps, your CPU just seems a tad abnormally high.

I agree with Reza, this is something you could take to TAC, and also agree with Reza they will probably recommend changing the IOS version.