[c-nsp] CPU utilization for handling interrupt

[Waseem]

Hi, TCP adjust-mss is the key, you were right.

Thanks 

Waseem



________________________________
From: Pete Lumbis <alumbis at gmail.com>
To: Nick Hilliard <nick at foobar.org>
Cc: Waseem <waseem_aliraqi at yahoo.com>; NSP <cisco-nsp at puck.nether.net>
Sent: Wednesday, October 5, 2011 4:15 PM
Subject: Re: [c-nsp] CPU utilization for handling interrupt


TCP Adjust-mss causes the 6k to punt the SYN to SW. I'm not sure if this will be process switched or CEF switched (interrupt), but I don't see a reason why we couldn't do it in software CEF.

-Pete


On Wed, Oct 5, 2011 at 8:20 AM, Nick Hilliard <nick at foobar.org> wrote:

On 05/10/2011 12:15, Waseem wrote:
>> It is a regular internet traffic to port 80, from our customers, which should be CEF switched.
>
>Sounds like your router is punting all traffic.  Are you seeing the
>following errors in your logs?
>
>> %CFIB-SP-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched
>
>If this is the case, you need to drop the number of routes that the box is
>handling, and then reboot the system.  Once the FIB limits are exceeded on
>this platform, rebooting is the only way to revert to hardware forwarding.
>
>Nick
>
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