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: [email protected] [mailto:cisco-nsp- > [email protected]] On Behalf Of Jeff Bacon > Sent: Tuesday, April 27, 2010 8:56 AM > To: [email protected] > 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. > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
