Re: [dm-devel] [PATCH] DM-CRYPT: Scale to multiple CPUs

Andi Kleen
2010-05-31T19:04:10Z

> I mean how it is implemented now in crypto API, and I was almost
> sure that aes-ni acceleration code uses cryptd (iow real asynchronous processing)
> and also that not all CPU cores can run these instruction in parallel.

I think you can configure it to use cryptd (or pcrypt), but it's not default
and usually higher overhead.

Each CPU core has its own support for AES-NI (it's part
of the SSE units), there's no shared crypto hardware between cores.

There are other systems with separate AES units, but they are
considerably more obscure.

-Andi
--
ak@linux.intel.com -- Speaking for myself only.