[c-nsp] RE: Unknown reason for High CPU 3620

Alex Foster afoster at gammatelecom.com
Wed Nov 3 12:19:54 EST 2004


Thanks Rodney - find config attached - the collisions were historical -
the interface is running full-duplex - here is the current interface
stats - the input errors are being investigated - but shouldn't be
responsible for the high CPU. Have also included sh vers and sh int
stat.

#sh int e1/0
Ethernet1/0 is up, line protocol is up
  Hardware is AmdP2, address is 0005.3245.e070 (bia 0005.3245.e070)
  Description: 
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 39/255, rxload 39/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 03:03:41
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 1/75, 790 drops
  5 minute input rate 1531000 bits/sec, 1935 packets/sec
  5 minute output rate 1532000 bits/sec, 2170 packets/sec
     21533985 packets input, 2108844947 bytes, 0 no buffer
     Received 62660 broadcasts, 0 runts, 0 giants, 0 throttles
     130659 input errors, 1608 CRC, 1272 frame, 0 overrun, 129051
ignored
     0 input packets with dribble condition detected
     23817320 packets output, 2045363543 bytes, 0 underruns(0/0/0)
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

#sh vers
Cisco Internetwork Operating System Software
IOS (tm) 3600 Software (C3620-IS-M), Version 12.2(3), RELEASE SOFTWARE
(fc1)
Copyright (c) 1986-2001 by cisco Systems, Inc.
Compiled Wed 18-Jul-01 13:45 by pwade
Image text-base: 0x600089A8, data-base: 0x6116A000

ROM: System Bootstrap, Version 11.1(20)AA2, EARLY DEPLOYMENT RELEASE
SOFTWARE (fc1)

xxxxxxxx uptime is 1 year, 29 weeks, 5 days, 1 hour, 48 minutes
System returned to ROM by power-on
System image file is "flash:c3620-is-mz.122-3.bin"

cisco 3620 (R4700) processor (revision 0x81) with 41984K/7168K bytes of
memory.
Processor board ID 25121827
R4700 CPU at 80Mhz, Implementation 33, Rev 1.0
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
4 Ethernet/IEEE 802.3 interface(s)
1 ATM network interface(s)
DRAM configuration is 32 bits wide with parity disabled.
29K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102


#sh int stat
ATM0/0
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor      60671    5098714     161118   15856770
             Route cache   25347153 2543070267   22778769 2540265463
                   Total   25407824 2548168981   22939887 2556122233
Ethernet1/0
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor      43533    2674126       7176     430560
             Route cache   22903843 2234233191   25355781 2188907917
                   Total   22947376 2236907317   25362957 2189338477
Interface Ethernet1/1 is disabled

Interface Ethernet1/2 is disabled

Interface Ethernet1/3 is disabled

Building configuration...

Current configuration : 1868 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname xxxxxxxxxx
!
logging buffered 4096 debugging
enable secret 
!
ip subnet-zero
!
!
no ip domain-lookup
!
call rsvp-sync
!
bridge crb
!
interface ATM0/0
 no ip address
 atm uni-version 3.1
 no atm ilmi-keepalive
 pvc 0/5 qsaal
 !
 pvc 0/16 ilmi
 !
!
interface ATM0/0.1 multipoint
 ip address xxxxxxx
 lane server-atm-address C5.777777777777777777777777.777777777777.77
 lane client ethernet xxxxxxx
 no cdp enable
!
interface ATM0/0.2 multipoint
 pvc 0/103
  encapsulation aal5snap
 !
 bridge-group 1
!
interface Ethernet1/0
 description 
 no ip address
 no ip mroute-cache
 full-duplex
 no cdp enable
 bridge-group 1
!
no ip http server
!
no cdp run
!
bridge 1 protocol ieee
!
dial-peer cor custom
!
!

-----Original Message-----
From: Rodney Dunn [mailto:rodunn at cisco.com] 
Sent: 03 November 2004 16:08
To: Alex Foster
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] RE: Unknown reason for High CPU 3620

CPU load at interrupt level is almost always packet
switching/features or alignment/spurious access corrections.

This CPU sounds high for that amount of traffic.

Can you list the full configuration /*taking out
any confidential stuff*/ so we can see the features
enabled?

2nd, you really need to clean up that ethernet
segement with all the collisions.  Can you convert
it to full-duplex?  I don't recall if you can do it
with the 3620 in later code.

Most likely it's not an issue with the ATM side.

Rodney


On Wed, Nov 03, 2004 at 03:44:07PM -0000, Alex Foster wrote:
> Thanks to the guys who responded - I have managed to narrow down the
> cause to high interrupt utilization and not processor utilization -
but
> Im still a little unclear as to what is causing the high interrupt
util.
> - is the ATM interface causing this ?  Again the traffic load is
little
> over 1.5 meg (in/out) - but constant - so I am wondering if the
> continual SARing is maybe having a negative effect on the CPU ?  If so
-
> is there a workaround or am I looking at a bigger platform to solve
the
> issue - if so any recommendations (I have a 3640 available but don't
> know if this will provide much of an improvement).
> 
>  
> 
> Regards
> 
>  
> 
> Alex
> 
>  
> 
>  
> 
> -----Original Message-----
> From: Alex Foster 
> Sent: 03 November 2004 13:37
> To: 'cisco-nsp at puck.nether.net'
> Subject: Unknown reason for High CPU 3620
> 
>  
> 
> I have a 3620 that is currently maxing out its CPU for no apparent
> reason - the traffic load on it at the moment is about 1 to 2 meg -
and
> sh proc cpu doesn't indicate any process that is causing the high CPU
> util.  Most of the traffic is SIP but I wouldn't have thought this
would
> have any bearing.  There are only two interfaces on the box in use -
an
> ATM 155 and a 10bt.  The traffic from the 10bt is bridged to a PVC on
> the ATM interface - nothing complicated.  
> 
>  
> 
> #sh proc cpu
> 
> CPU utilization for five seconds: 96%/93%; one minute: 90%; five
> minutes: 91%
> 
>  PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
> 
>    1      194708       9899756         19    0.00%  0.00%  0.00%   0
> Load Meter
> 
>    2        2008          223                9004  1.41%  0.13%  0.03%
> 66 Virtual Exec
> 
>  
> 
> #sh mem sum
> 
>                 Head    Total(b)     Used(b)     Free(b)   Lowest(b)
> Largest(b)
> 
> Processor   61D70EA0    12120416     6616992     5503424     5303744
> 5305428
> 
>       I/O    2900000     7340032     4387068     2952964     2920520
> 2947260
> 
>  
> 
> #sh int e1/0
> 
> Ethernet1/0 is up, line protocol is up
> 
>   Hardware is AmdP2, address is 0005.3245.e070 (bia 0005.3245.e070)
> 
>   Description: 
> 
>   MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
> 
>      reliability 255/255, txload 34/255, rxload 37/255
> 
>   Encapsulation ARPA, loopback not set
> 
>   Keepalive set (10 sec)
> 
>   ARP type: ARPA, ARP Timeout 04:00:00
> 
>   Last input 00:00:00, output 00:00:00, output hang never
> 
>   Last clearing of "show interface" counters 1y4w
> 
>   Queueing strategy: fifo
> 
>   Output queue 0/40, 0 drops; input queue 0/75, 103522 drops
> 
>   5 minute input rate 1470000 bits/sec, 1984 packets/sec
> 
>   5 minute output rate 1355000 bits/sec, 2166 packets/sec
> 
>      2150894411 packets input, 1646909945 bytes, 0 no buffer
> 
>      Received 88151770 broadcasts, 0 runts, 0 giants, 0 throttles
> 
>      6397644 input errors, 42166 CRC, 32878 frame, 0 overrun, 6355422
> ignored
> 
>      0 input packets with dribble condition detected
> 
>      2681876495 packets output, 1769855380 bytes, 0
> underruns(556991/1663306/0)
> 
>      165 output errors, 2220297 collisions, 50 interface resets
> 
>      0 babbles, 47 late collision, 1067254 deferred
> 
>      118 lost carrier, 0 no carrier
> 
>      0 output buffer failures, 0 output buffers swapped out
> 
>  
> 
> #sh int atm 0/0.2
> 
> ATM0/0.2 is up, line protocol is up
> 
>   Hardware is RS8234 ATMOC3
> 
>   MTU 4470 bytes, BW 155000 Kbit, DLY 80 usec,
> 
>      reliability 255/255, txload 2/255, rxload 2/255
> 
>   Encapsulation ATM
> 
>   3075506957 packets input, 1094442885139 bytes
> 
>   2362546968 packets output,988686523562 bytes
> 
>   0 OAM cells input, 0 OAM cells output
> 
>   AAL5 CRC errors : 81
> 
>   AAL5 SAR Timeouts : 0
> 
>   AAL5 Oversized SDUs : 0
> 
>   AAL5 length violation : 26
> 
>   AAL5 CPI Error : 0
> 
>  
> 
> Thanks 
> 
>  
> 
> Alex
> 
> 
> 
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