[ietf-dkim] Comments on -overview document?

[Michael Thomas]

Eliot Lear wrote:

>Bill,
>
>I think what Dave could say is that in I/O intensive environments DKIM
>will have a negligible impact because minimal disk I/O is required.  If
>your environment is not I/O bound then of course DKIM will have a
>marginal impact.  If you're using your CPUs efficiently already, good on
>you!
>  
>
The point that Bill brings up, however, is a good one and I suspect that 
he's
entirely right if one considers the _inbound_ which is very likely to be 
very
CPU bound with anti-spam/virus/malware/etc. Still in that case, it's not 
clear
that the DKIM overhead is likely to be very significant as the main cost for
smallish messages may not even be bound to the RSA and/or SHA overhead
(seeing how RSA verifies are so much cheaper than signing).

In any case, I think he's right that in order to give advise we'd do 
well to
actually state the test cases for which somebody could do their own
experimenting.

       Mike