[c-nsp] cat6500/fwsm performance

[Matlock, Kenneth L]

Well, technically if you can have all your tables/lookups
pre-populated....

1Gb/sec = 125MB/sec
Or 125KB/msec
Or 125B/usec

A 64 byte packet will then take about 0.5usec to send or receive. That
means receiving the packet, and sending it takes 1usec of time. That
leaves 29usec of time to process the packet, and get it ready to
forward. While I don't know the details on HOW it does it internally, I
could see how it *could* get it passed through in 30usec.

Now, real-world performance, with ACL's, NAT, etc I doubt you'd come
close. But from a theoretical perspective I can see that latency :)


Ken Matlock
Network Analyst
Exempla Healthcare
(303) 467-4671
matlockk at exempla.org


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jeff Bacon
Sent: Friday, June 03, 2011 2:30 PM
To: dwhitejr at cisco.com
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] cat6500/fwsm performance

I am, however, left with one mystery. 


How can the Cisco docs on a FWSM claim a 30-usec latency when clearly it
isn't capable of that, at least not in any configuration that I'm aware
of? Granted that it's all lies, damn lies, and marketing material, but
putting that number in the main data sheet on the main product page for
the card is a pretty ballsy lie even for Cisco. 

 

From: David White, Jr. (dwhitejr) [mailto:dwhitejr at cisco.com] 
Sent: Friday, June 03, 2011 12:04 AM
To: Jeff Bacon
Cc: Pete Templin; Peter Rathlev; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] cat6500/fwsm performance

 

And here is a great doc TAC wrote up on single flow TCP performance
which should answer all your questions:

https://supportforums.cisco.com/docs/DOC-12668

Sincerely,

David.




 
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