[c-nsp] 7500 RSP8 Throughput Ability

[Rodney Dunn]

On Thu, Dec 08, 2005 at 10:59:03PM -0500, David Coulson wrote:
> Rodney Dunn wrote:
> > If your packet size is large enough you can get 200 mbps through
> > one of the cards. I've tested that in the lab and at 1400 bytes
> > I think I could get close to 350 Mbps through it IIRC.
> 
> GEIP or GEIP+? I thought I read that the max rate on a GEIP was 400Mbit,
> and a GEIP+ was 800Mbit, although I can't imagine it getting even close
> to that...

They split the rx/tx over the two PCI's for the GEIP+ to get more bw
to/from the CyBus but like I've said you hit the CPU bottleneck first.

> 
> > That was with no features. One of the main problems we hit though
> > was the card doesn't support flow control so we saw overruns
> > when the upstream was bursting.
> 
> Is it even worth running GEIP/GEIP+ on 7500?

I've seen thousands of these cards running without any issues at
all if they are placed correctly in the network.

The best spot for them is connections to the core when they downstream
connections are T3's, T1's etc...such that your uplinks never run that
high.

Really guys, those cards were designed at the customer's request to give
them a physical GIG connectivity solution the core for moderate rates
while they upgraded the edges. If you are looking at GIGE/OC3 type
rates to/from the core don't waste your time with this box or these
cards because as soon as you start turning on features you will most
likely be unhappy.

Just being honest with ya...

> 
> David
> 
> -- 
> David J. Coulson
> email: david at davidcoulson.net
> web: http://www.davidcoulson.net/