Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 25 Aug 2002 18:50:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 25 Aug 2002 18:50:40 -0400 Received: from pizda.ninka.net ([216.101.162.242]:1156 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id ; Sun, 25 Aug 2002 18:50:39 -0400 Date: Sun, 25 Aug 2002 15:49:24 -0700 (PDT) Message-Id: <20020825.154924.104033788.davem@redhat.com> To: alan@lxorguk.ukuu.org.uk Cc: greearb@candelatech.com, linux-kernel@vger.kernel.org Subject: Re: packet re-ordering on SMP machines. From: "David S. Miller" In-Reply-To: <1030286473.16651.7.camel@irongate.swansea.linux.org.uk> References: <3D6884BC.5090004@candelatech.com> <1030286473.16651.7.camel@irongate.swansea.linux.org.uk> X-Mailer: Mew version 2.1 on Emacs 21.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 884 Lines: 18 From: Alan Cox Date: 25 Aug 2002 15:41:13 +0100 > 3) If answer to 2 is no, would you all be interested in a patch that > did allow strict ordering (if indeed I can figure out how to write one)? You should never need it. Ethernet, hubs, switches, routers, internet backbones etc will all cause packet re-ordering. You should also expect the percentage of re-ordered frames on the net to rise and rise. But to be honest, NAPI was meant to dramatically reduce the "SMP specific" causes of packet reordering. When a driver does use NAPI, the reordering due to SMP goes way down. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/