[c-nsp] High CPU caused by interupt on 7600 router

[Benjamin Lovell]

ELAM captures only one packet at a time so it's not as useful for figuring out what packets are causing high CPU. An RP-inand SPAN will be much better. Once you find out which packets are going to the CPU and you think that maybe those packets should not have hit the CPU then ELAM could be useful. 

BTW - there is no customer facing docs about ELAM as they are engineering level commands. That said it's pretty easy to capture an IP packet in ELAM. Reading all the fields in the DBUS and RBUS headers is another matter. 


-Ben


On Oct 1, 2010, at 11:31 AM, Rin wrote:

> Hi Ozgur, 
> 
> I saw TAC engineer do ELAM capture once but not understand much. Is there any documentation about ELAM capture?
> For CPU Profiling, do you mean this documentation?
> http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a00801c2af0.shtml#cd
> 
> It seems that CPU Profiling is not supported on 7609 with 12.2(33)SRD. 
> 
> Thanks, 
> 
> -----Original Message-----
> From: Ozgur Guler [mailto:gulerozgur at yahoo.co.uk] 
> Sent: Friday, October 01, 2010 6:36 PM
> To: Rin; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] High CPU caused by interupt on 7600 router
> 
> Try ELAM capture...
> TAC can help with the ELAM or CPU profiling.
> -Ozgur
> 
> 
> 
> 
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