From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751467AbaCUSwf (ORCPT ); Fri, 21 Mar 2014 14:52:35 -0400 Received: from shards.monkeyblade.net ([149.20.54.216]:35004 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751287AbaCUSwc (ORCPT ); Fri, 21 Mar 2014 14:52:32 -0400 Date: Fri, 21 Mar 2014 14:52:29 -0400 (EDT) Message-Id: <20140321.145229.1026128975151125729.davem@davemloft.net> To: eric.dumazet@gmail.com Cc: andi@firstfloor.org, hpa@zytor.com, kaber@trash.net, herbert@gondor.apana.org.au, hkchu@google.com, mwdalton@google.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC] csum experts, csum_replace2() is too expensive From: David Miller In-Reply-To: <1395406250.9114.142.camel@edumazet-glaptop2.roam.corp.google.com> References: <1395341341.9114.93.camel@edumazet-glaptop2.roam.corp.google.com> <87a9cknwk4.fsf@tassilo.jf.intel.com> <1395406250.9114.142.camel@edumazet-glaptop2.roam.corp.google.com> X-Mailer: Mew version 6.5 on Emacs 24.1 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.7 (shards.monkeyblade.net [149.20.54.216]); Fri, 21 Mar 2014 11:52:32 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Eric Dumazet Date: Fri, 21 Mar 2014 05:50:50 -0700 > It looks like a barrier() would be more appropriate. barrier() == __asm__ __volatile__(:::"memory")