Fast MAC algorithms?
Nicolas Williams
Nicolas.Williams at sun.com
Thu Jul 23 11:45:25 EDT 2009
On Thu, Jul 23, 2009 at 05:34:13PM +1200, Peter Gutmann wrote:
> "mheyman at gmail.com" <mheyman at gmail.com> writes:
> >2) If you throw TCP processing in there, unless you are consistantly going to
> >have packets on the order of at least 1000 bytes, your crypto algorithm is
> >almost _irrelevant_.
> >[...]
> >for a Linux 2.2.14 kernel, remember, this was 10 years ago.
>
> Could the lack of support for TCP offload in Linux have skewed these figures
> somewhat? It could be that the caveat for the results isn't so much "this was
> done ten years ago" as "this was done with a TCP stack that ignores the
> hardware's advanced capabilities".
How much NIC hardware does both, ESP/AH and TCP offload? My guess: not
much. A shame, that.
Once you've gotten a packet off the NIC to do ESP/AH processing, you've
lost the opportunity to use TOE.
Nico
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