Re: Asynchronous crypto layer.

[Sam Leffler <sam@xxxxxxxxx>]

James Morris wrote:
> On Fri, 29 Oct 2004, Sam Leffler wrote:
>
>
> > And a paper I wrote explains how I fixed many of the problems with the 
> > openbsd code in freebsd.
> >
> > http://www.usenix.org/publications/library/proceedings/bsdcon03/tech/leffler_crypto/leffler_crpto_html/
>
>
> Thanks, that's a useful reference.
>
> For handling overload of crypto hardware, I was thinking of falling back
> to software processing (really, I guess this is just load balancing
> between hardware and software).

I did a prototype scheduler (never committed) that took into account 
per-device performance metrics and outstanding operations.  The s/w 
crypto driver was just part of the mix.  As a result fallback on 
overload and using s/w crypto for small operands (where the setup 
overhead is too costly) just fell out.

        Sam