[cisco-bba] Cisco 7206VXR running out of steam at 20mbthroughput

Thu May 17 19:53:04 EDT 2007

You have to remember what the value actually means:

62%/62% 

Means 62% of the work is been packet switch 

And the left minus the right is the amount that is been process switched. 

Explaining the low process usage. You want this as much as possible.

Vince 

-----Original Message-----
From: cisco-bba-bounces at puck.nether.net
[mailto:cisco-bba-bounces at puck.nether.net] On Behalf Of Jason Lixfeld
Sent: Thursday, May 17, 2007 1:35 PM
To: cisco-bba at puck.nether.net
Subject: Re: [cisco-bba] Cisco 7206VXR running out of steam at
20mbthroughput

Something seems to be amiss.  How can your CPU utilization be at 62% with no
processes registering high CPU usage.  You've got lots of packets hitting
your FE interfaces, so I would think there would be an IP Input process or
something to justify the usage.

In any event...  Clear the counters on your FastEthernet interfaces.   
Make sure everything is 100/full (on the router and the switch) and let's
see what sort of errors (if any) show up on the interfaces after that.

You may also want to move FE0/0 to GE0/1 and move FE1/0 to GE0/2 or some
variation of that.  The onboard GEs will be able to push far more packets
than your FE PAs can.  If your issues are stemming from your FEs processing
more PPS than they can handle (or getting close to hitting that ceiling),
the move to the GEs will mitigate that and give you a better baseline.

On 17-May-07, at 1:19 PM, Wayne @ CTL wrote:

> Hi Frank, Jason, thanks for your replies.
> The half duplex was set for another test I have reset it to full- 
> duplex.
> Not sure about the implications of Vlan the subnets, and I tried ip 
> route-cache same-interface, it had no effect but I guess it may take 
> time if its a cache.
>
> Here are the results of the show procs and i/f:-
>
> Router#sh proc cpu | exc 0.00.*0.00
> CPU utilization for five seconds: 62%/62%; one minute: 61%; five
> minutes:
> 60%
>  PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
>   29      337020    111884       3012  0.00%  0.03%  0.01%   0 Net
> Background
>
>   32     1613052    468318       3444  0.07%  0.20%  0.17%   0 Per- 
> Second
> Jobs
>
>  123         824       120       6866  0.00%  0.02%  0.06%   0 Exec
>
> Router#show int f0/0
> FastEthernet0/0 is up, line protocol is up
>   Hardware is DEC21140A, address is 0050.2aca.2400 (bia 0050.2aca. 
> 2400)
>   Internet address is 212***/30
>   MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
>      reliability 255/255, txload 63/255, rxload 64/255
>   Encapsulation ARPA, loopback not set
>   Keepalive set (10 sec)
>   Full-duplex, 100Mb/s, 100BaseTX/FX
>   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 04:14:20
>   Input queue: 0/75/0/0 (size/max/drops/flushes); Total output
> drops: 0
>   Queueing strategy: fifo
>   Output queue: 0/40 (size/max)
>   5 minute input rate 25472000 bits/sec, 40880 packets/sec
>   5 minute output rate 24730000 bits/sec, 38624 packets/sec
>      614086423 packets input, 1854036321 bytes
>      Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
>      370 input errors, 0 CRC, 0 frame, 0 overrun, 370 ignored
>      0 watchdog
>      0 input packets with dribble condition detected
>      568907290 packets output, 2654008434 bytes, 0 underruns
>      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
>
>
> Router#show int f1/0
> FastEthernet1/0 is up, line protocol is up
>   Hardware is DEC21140, address is 0050.2aca.241c (bia 0050.2aca.241c)
>   Internet address is 212.***/27
>   MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
>      reliability 253/255, txload 65/255, rxload 63/255
>   Encapsulation ARPA, loopback not set
>   Keepalive set (10 sec)
>   Full-duplex, 100Mb/s, 100BaseTX/FX
>   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 04:15:01
>   Input queue: 0/75/0/0 (size/max/drops/flushes); Total output  
> drops: 56560
>   Queueing strategy: fifo
>   Output queue: 0/40 (size/max)
>   5 minute input rate 24802000 bits/sec, 38766 packets/sec
>   5 minute output rate 25523000 bits/sec, 40978 packets/sec
>      571887898 packets input, 2950256234 bytes
>      Received 60253 broadcasts, 0 runts, 673 giants, 0 throttles
>      9379444 input errors, 9379388 CRC, 0 frame, 0 overrun, 56 ignored
>      0 watchdog
>      4631020 input packets with dribble condition detected
>      617023050 packets output, 2136329926 bytes, 0 underruns
>      0 output errors, 9521056 collisions, 1 interface resets
>      0 babbles, 0 late collision, 0 deferred
>      0 lost carrier, 0 no carrier
>      0 output buffer failures, 0 output buffers swapped out
>
> Thanks,
>
> Wayne
>
>
> ----- Original Message -----
> From: Frank Bulk
> To: 'Wayne @ CTL' ; cisco-bba at puck.nether.net
> Sent: Thursday, May 17, 2007 4:27 PM
> Subject: RE: [cisco-bba] Cisco 7206VXR running out of steam at 20mb
> throughput
>
>
> Please post a copy of "sh proc cpu | exc 0.00.*0.00"
>
> Regards,
>
> Frank
>
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