From: Herbert Xu Subject: Re: converting sync driver to async Date: Wed, 17 Feb 2010 08:08:17 +0800 Message-ID: <20100217000817.GA11975@gondor.apana.org.au> References: <311e0d1f1002160806j37c8d358xe3bc83805adee176@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-crypto@vger.kernel.org To: avital sela Return-path: Received: from rhun.apana.org.au ([64.62.148.172]:59402 "EHLO arnor.apana.org.au" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933630Ab0BQAIT (ORCPT ); Tue, 16 Feb 2010 19:08:19 -0500 Content-Disposition: inline In-Reply-To: <311e0d1f1002160806j37c8d358xe3bc83805adee176@mail.gmail.com> Sender: linux-crypto-owner@vger.kernel.org List-ID: On Tue, Feb 16, 2010 at 06:06:37PM +0200, avital sela wrote: > Hello, > > I have written sha and aes HW accelerator drivers for our custom > drivers (thanks for your patient help) and they work great. > To exploit the full potential of the HW I want to port them to the > ASYNC interface and have some questions. > 1. Using my current setup I see the following results (measured with iperf) > no ipsec -85 mbits > ESP in tunnel mode with null algs - 45 mbits > ESP in tunnel mode with aes and sha1 - 32 mbits > Is it reasonable to have the throughput drop so much even without any > actual crypto going on? Can this mostly be attributed to the bigger > packets ? That should be easy to tell. Just disable GSO/SG/checksum offload on the physical interface and retest with no ipsec. > My understanding of the results is that the maximum throughput I can > hope to achieve on this systen by only improving the crypto drivers is > 45 mbits? Yes. > 2. Is there any comparison somewhere between OCF performance and Acrypto? Not that I'm aware unfortunately. > 3. Using drivers/crypto/talitos as a reference I am setting the alg > name to "authenc(hmac(sha1),cbc(aes))",cra_flags to > CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC; > and cra_type to &crypto_aead_type. My existing driver had a > cra_list field. Is that required for this type of driver as well? The cra_list field does not have to be initialised so no you don't need to make it explicit. Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt