[c-nsp] High interrupt load on 7507

[Bisazza, Chris]

All figures in most Cisco documentation refer to CEF switching - it's
very difficult to get process switching info.

In my experience you see a 3x improvement in process switching
performance from an RSP4 to an RSP8 or RSP16, with no significant
difference between the latter two.

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Joerg Goltermann
Sent: 22 June 2006 07:18
To: Rodney Dunn; cisco-nsp; David Coulson
Subject: Re: [c-nsp] High interrupt load on 7507


Rodney Dunn wrote:
> On Wed, Jun 21, 2006 at 04:12:46PM -0400, David Coulson wrote:
>> Rodney Dunn wrote:
>>> Yes...faster CPU more pps. But it will be no where close to unicast 
>>> switching performance.
>> What level of performance increase am I going to see by moving from 
>> RSP4 to 4+, 8 or RSP16?
> 
> I don't have any raw data. I'd guess probably 3x or 4x. That's a 
> guess.


Really sure?

http://www.cisco.com/en/US/products/hw/routers/ps359/products_data_sheet
09186a0080092013.html 


says "The Route Switch Processor 8 (RSP8) is Cisco Systems' 
new-generation, main system processor for the Cisco 7500 Series Router. 
The RSP8 increases switching performance more than 40 percent compared 
to the RSP4."

and

http://www.cisco.com/en/US/products/hw/routers/ps359/products_data_sheet
09186a008009201c.html

says "The Route Switch Processor 16 (RSP16) is the newest and 
highest-performance main system processor for the Cisco 7500 Series 
Router. The RSP16 supports up to 1 GB of program memory, allowing 
customers to significantly increase their route tables. The RSP16 
provides significant performance enhancements, increasing switching 
performance by 20 percent and 55 percent compared the RSP8 and RSP4+, 
respectively."

I think David would stay in trouble, even with a RSP16. dCEF is the 
solution for this platform.


	- Joerg


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