From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81E40C433E1 for ; Thu, 20 Aug 2020 20:10:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5B730207BB for ; Thu, 20 Aug 2020 20:10:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728252AbgHTUK6 (ORCPT ); Thu, 20 Aug 2020 16:10:58 -0400 Received: from helcar.hmeau.com ([216.24.177.18]:49320 "EHLO fornost.hmeau.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728141AbgHTUK6 (ORCPT ); Thu, 20 Aug 2020 16:10:58 -0400 Received: from gwarestrin.arnor.me.apana.org.au ([192.168.0.7]) by fornost.hmeau.com with smtp (Exim 4.92 #5 (Debian)) id 1k8qtk-0001j7-1U; Fri, 21 Aug 2020 06:10:57 +1000 Received: by gwarestrin.arnor.me.apana.org.au (sSMTP sendmail emulation); Fri, 21 Aug 2020 06:10:55 +1000 Date: Fri, 21 Aug 2020 06:10:55 +1000 From: Herbert Xu To: Ben Greear Cc: Ard Biesheuvel , Linux Crypto Mailing List , Eric Biggers Subject: Re: [PATCH 0/5] crypto: Implement cmac based on cbc skcipher Message-ID: <20200820201055.GA24119@gondor.apana.org.au> References: <20200820070645.GA21395@gondor.apana.org.au> <20200820072910.GA21631@gondor.apana.org.au> <20200820074414.GA21848@gondor.apana.org.au> <20200820075353.GA21901@gondor.apana.org.au> <6bd84823-7dc6-e132-2959-e73d6806d2f1@candelatech.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6bd84823-7dc6-e132-2959-e73d6806d2f1@candelatech.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org On Thu, Aug 20, 2020 at 06:54:58AM -0700, Ben Greear wrote: > > Here's a run on an: Intel(R) Core(TM) i7-7700T CPU @ 2.90GHz > > testing speed of async cmac(aes-aesni) (cmac(aes-aesni)) > > [ 259.397910] tcrypt: test 8 ( 1024 byte blocks, 1024 bytes per update, 1 updates): 8442 cycles/operation, 8 cycles/byte > > testing speed of async cmac(aes-generic) (cmac(aes-generic)) > > [ 294.171530] tcrypt: test 8 ( 1024 byte blocks, 1024 bytes per update, 1 updates): 9022 cycles/operation, 8 cycles/byte > > On my slow apu2 board with processor: AMD GX-412TC SOC > > testing speed of async cmac(aes-aesni) (cmac(aes-aesni)) > > [ 51.751810] tcrypt: test 8 ( 1024 byte blocks, 1024 bytes per update, 1 updates): 18759 cycles/operation, 18 cycle > > testing speed of async cmac(aes-generic) (cmac(aes-generic)) > > [ 97.837497] tcrypt: test 8 ( 1024 byte blocks, 1024 bytes per update, 1 updates): 31365 cycles/operation, 30 cycle So clearly aes-generic is slower than aes-aesni even with saving and restoring for each block. Therefore improving the performance of the latter per se does not make sense. Cheers, -- Email: Herbert Xu Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt