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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 7FC05C43603 for ; Wed, 4 Dec 2019 09:15:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3C358206DB for ; Wed, 4 Dec 2019 09:15:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="id/Ecr3j" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727254AbfLDJO7 (ORCPT ); Wed, 4 Dec 2019 04:14:59 -0500 Received: from merlin.infradead.org ([205.233.59.134]:59088 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725922AbfLDJO7 (ORCPT ); Wed, 4 Dec 2019 04:14:59 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Ze/GQOZbaeIXq6JrvkaIDBtmgtEHGOqhn5uCBmHdF9g=; b=id/Ecr3j6GF6mMKEOyen8Zi4c ZQ2Hd5tPDJBwLZc/1pkGYkD+iBSsAQjoAcRHL0meYWETEg+5fAKNzggdRXasllVFYixIUDovMIXlI 9WR5O2fCD1BD7AN4iep+oGGnNwmmO37K2xbq9gVp9QaxjWPdyv6tm6h7Bve4bJxoI6Psi6lxnUoM8 9Wk4r6FmcLxTt/8E6HL9fkWfwKG1+FbPNizYmhb2q5vwFrWaBOVDN50hdzbGzkEk7aVUov0yGByfN PE7hBxHExDrKIZlEIUF9Q9joRxqucpMp1xvSRUHCzGqdOmDcf35Cqm2XGnusm380JRp+0pjlqFqKX bRcBUMAEw==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1icQkH-00042f-Em; Wed, 04 Dec 2019 09:14:53 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id BDFE33006E3; Wed, 4 Dec 2019 10:13:33 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 49078200A908B; Wed, 4 Dec 2019 10:14:50 +0100 (CET) Date: Wed, 4 Dec 2019 10:14:50 +0100 From: Peter Zijlstra To: David Laight Cc: linux-kernel , "x86@kernel.org" , Thomas Gleixner Subject: Re: [PATCH] x86: Optimise x86 IP checksum code Message-ID: <20191204091450.GQ2844@hirez.programming.kicks-ass.net> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 03, 2019 at 11:52:09AM +0000, David Laight wrote: > I did get about 12 bytes/clock using adox/adcx but that would need run-time > patching and some AMD cpu that support the instructions run them very slowly. Isn't that was we have alternative_call() for?