Re: Linux 2.6 crypto API and HW accelerators

[James Morris <jmorris@xxxxxxxxxx>]

On Tue, 4 May 2004, Eugene Surovegin wrote:

> In short, my experience showed that without significant changes in current 
> implementation, e.g. adding async crypto, adding hardware crypto is worth only 
> for relatively slow CPUs, e.g. less than 1Ghz, and even with slow processor 
> overhead can be so big, that short packets are better processed by software 
> path.

Yes, have a look at the OpenBSD paper at 
http://www.openbsd.org/papers/ocf.pdf

Their results show marked performance improvements for larger packets
(even though the packets are making multiple trips across the PCI bus),
and they suggest batching smaller packets.


- James
-- 
James Morris
<jmorris@xxxxxxxxxx>



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