From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752757Ab1H2Hce (ORCPT ); Mon, 29 Aug 2011 03:32:34 -0400 Received: from mail-ww0-f44.google.com ([74.125.82.44]:61338 "EHLO mail-ww0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751894Ab1H2Hc0 (ORCPT ); Mon, 29 Aug 2011 03:32:26 -0400 Message-ID: <4E5B4083.6050001@gnutls.org> Date: Mon, 29 Aug 2011 09:32:19 +0200 From: Nikos Mavrogiannopoulos User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.20) Gecko/20110820 Icedove/3.1.12 MIME-Version: 1.0 To: David Miller CC: cryptodev-linux-devel@gna.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: comparison of the AF_ALG interface with the /dev/crypto References: <4E5A3FCC.2030504@gnutls.org> <20110828.163554.2024158531156183815.davem@davemloft.net> In-Reply-To: <20110828.163554.2024158531156183815.davem@davemloft.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/28/2011 10:35 PM, David Miller wrote: >> 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. However, I'll update the comparison page to include the splice version as well. regards, Nikos