Re: High interrupt cpu usage on 7206...

Wow Carlos, nice dig and feedback. I9m sure we all can use this
information.
Appreciate the follow-up bro.

Best Regards,
Joe Sanchez

On 7/24/14, 8:13 AM, "Carlos G Mendioroz" <tron_at_huapi.ba.ar> wrote:

>Well, it seems that it's just that my expectations on the capacity of
>the box were above the real power of it.
>I ended up removing all the NBAR classification and we are back in
>business (CPU on 20-25% for ~50Mbps).
>
>In the process, I learned something about the new 15.x CEF
>implementation: PBR default NH was not supported by CEF before,
>so default PBR (default route) flows were punted to the RP.
>Now it is, but with a requirement that was not there:
>NH has to be real NH, i.e., it will not be recursivelly determined.
>(recursive worked before, now its optional for specific routes)
>
>The problem with that is that it creates a single point of failure. If
>the NH goes down, your PBR creates a black hole.
>So I used to use "recursive" NH with a static route that was tracked.
>No joy in 15.x, so I went back to 12.4.
>
>Thanks for tunning :)
>-Carlos
>
>Carlos G Mendioroz @ 23/07/2014 10:56 -0300 dixit:
>> Andrew,
>> thanks. As most of the CPU is being chewed at interrupt time, there is
>> no process in the process list that has any significant portion of it.
>>
>> That document (and many others) redirect to
>>
>>
>>http://www.cisco.com/c/en/us/support/docs/routers/7500-series-routers/411
>>20-highcpu-interrupts.html
>>
>> Which I'm starting to memorize already :-/
>>
>> -Carlos
>>
>> Andrew LaPorte @ 23/07/2014 10:51 -0300 dixit:
>>> Carlos,
>>>
>>> I typical start out with a " show proc cpu" or " show proc cpu sorted"
>>>to
>>> figure out which process is eating up the cpu. I then normally try to
>>> figure out what the process is responsible for.
>>>
>>> Here is a doc that may help:
>>>
>>>http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/1
>>>5095
>>> -highcpu.html?referring_site=bodynav
>>>
>>> I know it is not specific to the 7200 but it's a good read.
>>>
>>> Andy
>>>
>>> -----Original Message-----
>>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>>> Carlos G Mendioroz
>>> Sent: Wednesday, July 23, 2014 9:27 AM
>>> To: Cisco certification
>>> Subject: OT: High interrupt cpu usage on 7206...
>>>
>>> is driving me nuts :(
>>>
>>> I'm trying to nail down what is taking a 7206 with G1 to its knees
>>>with just
>>> about 50Mbps (75%/72% cpu).
>>>
>>> The config has many things, like WCCP, QoS, PBR, NBAR and OSPF + BGP,
>>>but
>>> still, 50Mbps for a G1 should be a breeze, shouldn't it ?
>>>
>>> I'm seeing some SPD flushes, trying to make sense of them.
>>> But I would not mind advice on what to look after.
>>> (I was hoping CSCtg42179 would save my day, but upgraded to 12.4.24T8
>>>and
>>> same thing...)
>>>
>>> TIA,
>>> --
>>> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
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>>>
>>>
>>>
>>>
>>>
>>
>
>--
>Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>
>
>Blogs and organic groups at http://www.ccie.net
>
>_______________________________________________________________________
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Received on Thu Jul 24 2014 - 10:01:05 ART