On Wed, Jun 29, 2016 at 07:59:22AM -0700, Andy Lutomirski wrote:

quoted

I suspect that, if you compare a synchronous implementation that can

use virtual addresses to a DMA based implementation that can't, you'll
find that, for short messages like tcp md5 uses, the synchronous
implementation would win every time.  I'm wondering if shash should
gain the ability to use scatterlists and, if it doesn't already have
it, the ability to use synchronous hardware implementations (like
SHA-NI, for example, although I don't think that's useful for MD5).

I don't understand, if you add SGs to shash you get ahash.  So
why wouldn't you just use ahash?

AFAICS tcp md5 already uses ahash in sync mode so there is nothing
asynchronous here at all.

Cheers,
-- 
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