Re: [ptxdist] [RFC/PATCH 0/3] cryptodev

[Ladislav Michl <ladis@linux-mips.org>]

On Mon, Jul 03, 2017 at 08:56:42AM +0200, Robert Schwebel wrote:
> On Mon, Jul 03, 2017 at 12:03:26AM +0200, Alexander Dahl wrote:
> > On Sun, Jul 02, 2017 at 10:30:30PM +0200, Clemens Gruber wrote:
> > > I am wondering about the performance improvements when using the
> > > cryptodev openssl engine. There must be some cost for the context
> > > switches, but this is probably outweighed by the offloading.
> > > Did you for example run openssl speed aes-128-cbc before and after?
> > > And on what platform did you try it?
> > 
> > fli4l [1] uses cryptodev and the experience there is, it depends on
> > the platform. Some platforms benefit a lot, especially for OpenVPN,
> > others not so much. Depends on what the CPU offers and how fast the
> > system in general is.
> 
> Do you know why the module is not in mainline? Is there a discussion
> where the kernel maintainers motivate why they don't like this solution?

The module itself is 10+ years old and it is highly unlikely it will be
ever merged as it uses ioctl approach - makes API compatible with OpenBSD.
Meawhile AF_ALG API was introduced without anyone really interested (people
are still using /dev/crypto). Also see this comparsion:
http://cryptodev-linux.org/comparison.html

	ladis

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