[c-nsp] 6500 latency

[David Prall]

Jeff,
This is an old document. But it gives the numbers.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_
paper0900aecd800c9589.pdf

David

--
http://dcp.dcptech.com


> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Jeff Bacon
> Sent: Tuesday, April 27, 2010 8:56 AM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] 6500 latency
> 
> OK, I know that a 6500 is not a super low latency box. I've seen around
> 17usec, card to card to another switch CFC mode, but due to time
> constraints have done little formal analysis.
> 
> 
> I'm guessing its better in DFC mode, and on 6700 cards, and if your
> traffic is local to a card or to a fabric port such that it doesn't
> have to traverse the fabric.
> 
> I'm also guessing that sup32s and anything on classic bus (including
> the two interfaces on the sup720) aren't super-high latency either.
> 
> Has anyone done any work on what the overall parameters are on a 6500's
> switching latency? Or got a pliable cisco rep who can get me to someone
> who can unlock those documents?
> 
> Clearly Cisco has, to the extent that a cisco exec told me yesterday
> that they see no role for the 6500 in low-latency financial market apps
> except in edge cases where NAT is needed and even then I should
> consider an ASR (of course they need to sell more nexii I imagine - but
> what, am I made of money???). Strangely, though, I find them highly
> reticent to share anything about the actual facts of the matter. Maybe
> they're annoyed that I buy mostly refurb gear. :)
> 
> (Then again, I tend to find that most micro-level-latency talk to be
> half marketing fluff and mantra, and/or an excuse to spend a ton more
> money on product X.)
> 
> It's a shame that most exchanges force me to NAT to talk to them unless
> I want to do Really Stupid Things with my network, or talk ARIN out of
> a /22. Which is why I have 6500s everywhere (and sometimes wonder about
> the wisdom thereof, given the costs).
> 
> OK, I admit I am ranting.
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