[c-nsp] 7200s and CEF (Was: No 12.4T for 7500s)

[Gert Doering]

Hi,

On Tue, Oct 04, 2005 at 10:06:59AM -0500, Pete Templin wrote:
> (Circling back to this topic)  Doesn't the NPE handle the switching 
> decision on every packet (NSE w/ PXF excluded)?  CEF may be optimized 
> for high switching rates amidst large routing tables, but isn't the 
> lookup still done on the general-purpose CPU, and therefore still 
> susceptible to sharing the CPU with other tasks?

CEF forwarding runs in the packet interrupt.  No other tasks there.

(And yes, you *can* get problems if the packet rate is too high, and
no CPU is left for "normal" tasks)

gert
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