[nsp] NPE-G1

[Roman Sokolov]

Hello David,

Saturday, January 31, 2004, 4:41:54 AM, you wrote:
DS> The limit is the CPU.  Cisco's marketing numbers for the NPE-G1 forwarding
DS> ability is 1Mpps.  So just doing the math means that you can do on the order
DS> of 1Gig unidirectional, but no more.  Given that the real world PPS numbers
DS> are often different, it should be of no surprise that no one has reported
DS> wire-rate.
This is ok, but comparing to competing 7507 we have this situation: even
with RSP16 it can do only half of NPE-G1 performance, and this in plain
CEF. Even more, with so "great" feature as dCEF it can't do more than 15%
of GE at one linecard (in real life, VIP4-80 can do only 50-70kpps). So, on
7507 full-load (dCEF and modern VIPs) we have
560kpps(2xRSP16)+210kpps(3xGEIP+, 70k on each - no more)+300kpps(other 2
VIPs), 2gbps bus (and many issues problems with netflow from VIP's etc.).
Now it looks no so good, isn't it?

DS> Now, that is not to say that the NPE-G1 isn't a useful NPE.  We've got a
DS> large number deployed and they have provided a very useful extension to the
DS> life cycle of the 7200 platform.

DS> David

DS> On 1/30/04 2:24 PM, "Streiner, Justin" <streiner at stargate.net> wrote:

>> On Fri, 30 Jan 2004, Gert Doering wrote:
>> 
>>> On Fri, Jan 30, 2004 at 04:47:30AM -0600, HyunSeog Ryu wrote:
>>> [..]
>>>> Besides, GE usage will be limited from PCI bus speed - 800Mb I believe -,
>>>> so I guess combined bandwidth from 3 GE ports in NPE-G1 can not be exceed
>>>> more than PCI bus speed limit at all.
>>> 
>>> This is not correct!  The 3GEs on the NPE-G1 are NOT connected to any of
>>> the PCI buses in the 7206VXR.
>> 
>> True, though I haven't heard of anyone that's been able to get wire-speed
>> performance on the GE ports directly on the NPE-G1 using real-world
>> traffic/conditions :-)  I'm sure the performance is better than a PA-GE on
>> one of the PCI buses, but I don't know how much better...
>> 
>> jms
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-- 
Best regards,
 Roman
 mailto:rps at cheater.ru

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