Received: with ECARTIS (v1.0.0; list netdev); Fri, 13 Jun 2003 22:40:41 -0700 (PDT) Received: from pizda.ninka.net (IDENT:root@pizda.ninka.net [216.101.162.242]) by oss.sgi.com (8.12.9/8.12.9) with SMTP id h5E5eU2x006015 for ; Fri, 13 Jun 2003 22:40:31 -0700 Received: from localhost (IDENT:davem@localhost.localdomain [127.0.0.1]) by pizda.ninka.net (8.9.3/8.9.3) with ESMTP id WAA03912; Fri, 13 Jun 2003 22:36:34 -0700 Date: Fri, 13 Jun 2003 22:36:34 -0700 (PDT) Message-Id: <20030613.223634.74746570.davem@redhat.com> To: niv@us.ibm.com Cc: anton@samba.org, 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: <3EEAAFA6.9080609@us.ibm.com> References: <20030613223841.GB32097@krispykreme> <20030613.154634.74748085.davem@redhat.com> <3EEAAFA6.9080609@us.ibm.com> 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 X-archive-position: 3230 X-ecartis-version: Ecartis v1.0.0 Sender: netdev-bounce@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com X-original-sender: davem@redhat.com Precedence: bulk X-list: netdev From: Nivedita Singhvi Date: Fri, 13 Jun 2003 22:16:22 -0700 Yep, but it really doesn't have too many options (sic pun ;)).. i.e. The max the options can add are 40 bytes, speaking strictly TCP, not IP. This really should fit into one extra cacheline for most architectures, at most, right? It's what the bottom of the header is aligned to, but we build the packet top to bottom not the other way around.