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Community Member

high CPU utilization

we hv cisco router 2521. it shows 95 to 99% cpu utilization when it recives udp broadcast to declare result of lottery system to all hosts.during that time it give high latency & RTOs for 1 to 2 minutes as our result is broadcasted on every 15 minutes at which router shows latency & high cpu utilization ,,why so ?

11 REPLIES
Community Member

Re: high CPU utilization

Hi,

what is dram and flash memory size and how many host has working via thri router?

Sap

Community Member

Re: high CPU utilization

Below is details of router hardware & the peak time around 700 users connect to the router:

cisco 2520 (68030) processor (revision M) with 14336K/2048K bytes of memory.

Processor board ID 03851311, with hardware revision 00000002

Bridging software.

X.25 software, Version 3.0.0.

Basic Rate ISDN software, Version 1.1.

1 Ethernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

2 Low-speed serial(sync/async) network interface(s)

1 ISDN Basic Rate interface(s)

32K bytes of non-volatile configuration memory.

16384K bytes of processor board System flash (Read ONLY)

below the stat of cpu when result is broadcasted :

CPU utilization for five seconds: 99%/39%; one minute: 90%; five minutes: 74%

23 80768484 14081200 5735 54.29% 52.48% 43.41% 0 IP Input

Re: high CPU utilization

Hi

The best possible fix for ip input crisis is enabling ip cef on global mode.

But i am afraid whether your router's ios can support cef.

Try enabling the command ip cef under global mode and check .

regds

Community Member

Re: high CPU utilization

Dear

U can refer to following links based on your condition

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a00800a70f2.shtml#determ_cause

Regards!!

Mahesh

Re: high CPU utilization

Please paste the full output of " Show proccess CPU " and " Show process memory "

-amit singh

Community Member

Re: high CPU utilization

plz find attaced file of cpu proc.

Re: high CPU utilization

Hi,

Try

conf t

ip cef

Try enabling " ip route-cache " under all the interfaces.

Check the below link:

http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a00801c2af3.shtml

Also, Scan your LAn for any worm/viruses.

HTH

-amit singh

Community Member

Re: high CPU utilization

hi,

as u see in sh proc cp- the ip input is the major thing.

what is the traffic-rate during that time?

(sh int e0).

is this a new application or was it in the past ok ?

a 25xx router has not that performance to handle e.g. 10mb/s -

Community Member

Re: high CPU utilization

check your buffers

if you have a high influx of traffic and your buffers are low/default, you may be causing the router to create memory buffers at the same time it is receiving a high influx of traffic.

do a sho buff and post the results.

Community Member

Re: high CPU utilization

hi,

Below is buffer output: when thr is no much load on the router: Plz tell me what i need to clear & configure. I am attaching router configuration file also

SugalLdh#sh buffers

Buffer elements:

499 in free list (500 max allowed)

8363091 hits, 0 misses, 0 created

Public buffer pools:

Small buffers, 104 bytes (total 50, permanent 50):

49 in free list (20 min, 150 max allowed)

35400 hits, 1 misses, 3 trims, 3 created

0 failures (0 no memory)

Middle buffers, 600 bytes (total 25, permanent 25):

23 in free list (10 min, 150 max allowed)

17942 hits, 0 misses, 0 trims, 0 created

0 failures (0 no memory)

Big buffers, 1524 bytes (total 150, permanent 50):

150 in free list (5 min, 150 max allowed)

821957 hits, 7556 misses, 1180 trims, 1280 created

2280 failures (0 no memory)

VeryBig buffers, 4520 bytes (total 10, permanent 10):

10 in free list (0 min, 100 max allowed)

27525 hits, 0 misses, 0 trims, 0 created

0 failures (0 no memory)

Large buffers, 5024 bytes (total 0, permanent 0):

0 in free list (0 min, 10 max allowed)

0 hits, 0 misses, 0 trims, 0 created

0 failures (0 no memory)

Huge buffers, 18024 bytes (total 0, permanent 0):

0 in free list (0 min, 4 max allowed)

0 hits, 0 misses, 0 trims, 0 created

0 failures (0 no memory)

Interface buffer pools:

Ethernet0 buffers, 1524 bytes (total 32, permanent 32):

8 in free list (0 min, 32 max allowed)

47 hits, 7 fallbacks

8 max cache size, 8 in cache

38286 hits in cache, 27 misses in cache

BRI0 buffers, 1524 bytes (total 4, permanent 4):

3 in free list (0 min, 4 max allowed)

3 hits, 0 fallbacks

1 max cache size, 1 in cache

0 hits in cache, 0 misses in cache

BRI0:1 buffers, 1524 bytes (total 16, permanent 16):

12 in free list (0 min, 16 max allowed)

12 hits, 0 fallbacks

4 max cache size, 4 in cache

0 hits in cache, 0 misses in cache

BRI0:2 buffers, 1524 bytes (total 16, permanent 16):

12 in free list (0 min, 16 max allowed)

12 hits, 0 fallbacks

4 max cache size, 4 in cache

0 hits in cache, 0 misses in cache

Serial0 buffers, 1524 bytes (total 32, permanent 32):

6 in free list (0 min, 32 max allowed)

136216 hits, 552798 fallbacks

8 max cache size, 5 in cache

2272903 hits in cache, 688989 misses in cache

Serial1 buffers, 1524 bytes (total 32, permanent 32):

7 in free list (0 min, 32 max allowed)

14267 hits, 266752 fallbacks

8 max cache size, 8 in cache

2776766 hits in cache, 280994 misses in cache

Serial2 buffers, 1524 bytes (total 8, permanent 8):

6 in free list (0 min, 8 max allowed)

8 hits, 0 fallbacks

0 max cache size, 0 in cache

0 hits in cache, 8 misses in cache

Serial3 buffers, 1524 bytes (total 8, permanent 8):

6 in free list (0 min, 8 max allowed)

6 hits, 0 fallbacks

0 max cache size, 0 in cache

0 hits in cache, 6 misses in cache

CD2430 I/O buffers, 1524 bytes (total 20, permanent 20):

10 in free list (0 min, 20 max allowed)

10 hits, 0 fallbacks

Re: high CPU utilization

Try removing "ip route-cache flow" from "interface Serial1"

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