[nsp] ip verify unicast not logging in ACL

Oliver Boehmer (oboehmer) oboehmer at cisco.com
Thu Nov 13 08:22:47 EST 2003

> > CEF switching can occur in both the interrupt as well as the process
> > path (at least in recent IOS releases like 12.0S/12.2/12.3/etc.),
> > the latter is called "CEF process path". This was mainly added to
> > enable tag/mpls primitives (push/pop/swap) also in the process path
> > (ex: "debug mpls packet" causes the mpls pkts to be
> > "process-cef-switched", "debug ip packet" also prints a "cef
> > process switched" or similar in the debug). 
> > 
> > So in summary: A CEF-switched pkt is not necessarily nterrupt
> > switched..
> Can you provide any perspective on the performance of CEF process
> switching relative to CEF interrupt switching and standard process
> switching?

I don't recall a dedicated "CEF Process Switch" performance test, but an
educated guess is that it "performs" as well (rather: as bad) as the
old-style process switching, so between 5% and 10% of the performance
compared to interrupt switching. Take a look at
nce.pdf for some sample perf figures..


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