Re: comparison of the AF_ALG interface with the /dev/crypto

From: Nikos Mavrogiannopoulos <redacted>
Date: Mon, 29 Aug 2011 09:32:19 +0200

On 08/28/2011 10:35 PM, David Miller wrote:

quoted

quoted

The benchmark idea was to test the speed of initialization, encryption
and deinitiation, as well as the encryption speed alone. These are the
most common use cases of the frameworks (i.e. how they would be used
by a cryptographic library).

Be sure to use splice() with AF_ALG for maximum performance.
For example, see the test program below.  You'll need to replace
"8192" with whatever the page size is on your cpu.

As I understand with splice you can encrypt only page aligned data
that span a multiple of pages. This is a very uncommon case. My
benchmark targets the generic case, i.e., the way this interface will
be used in crypto libraries like gnutls.

Only the buffer you use must have these properties, you can use
whatever lengths you like.