Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265564AbTFMWgk (ORCPT ); Fri, 13 Jun 2003 18:36:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265567AbTFMWgk (ORCPT ); Fri, 13 Jun 2003 18:36:40 -0400 Received: from pizda.ninka.net ([216.101.162.242]:15802 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id S265564AbTFMWgj (ORCPT ); Fri, 13 Jun 2003 18:36:39 -0400 Date: Fri, 13 Jun 2003 15:46:34 -0700 (PDT) Message-Id: <20030613.154634.74748085.davem@redhat.com> To: anton@samba.org Cc: haveblue@us.ibm.com, hdierks@us.ibm.com, scott.feldman@intel.com, dwg@au1.ibm.com, linux-kernel@vger.kernel.org, milliner@us.ibm.com, ricardoz@us.ibm.com, twichell@us.ibm.com, netdev@oss.sgi.com Subject: Re: e1000 performance hack for ppc64 (Power4) From: "David S. Miller" In-Reply-To: <20030613223841.GB32097@krispykreme> References: <1055521263.3531.2055.camel@nighthawk> <20030613223841.GB32097@krispykreme> X-FalunGong: Information control. 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: 776 Lines: 19 From: Anton Blanchard Date: Sat, 14 Jun 2003 08:38:41 +1000 This is only worth it if most packets will have the same sized header. Networking guys: is this a valid assumption? Not really... one retransmit and the TCP header size grows due to the SACK options. I find it truly bletcherous what you're trying to do here. Why not instead find out if it's possible to have the e1000 fetch the entire cache line where the first byte of the packet resides? Even ancient designes like SunHME do that. - 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/