Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265583AbTFMXmz (ORCPT ); Fri, 13 Jun 2003 19:42:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265584AbTFMXmz (ORCPT ); Fri, 13 Jun 2003 19:42:55 -0400 Received: from pizda.ninka.net ([216.101.162.242]:49338 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id S265583AbTFMXmy (ORCPT ); Fri, 13 Jun 2003 19:42:54 -0400 Date: Fri, 13 Jun 2003 16:52:50 -0700 (PDT) Message-Id: <20030613.165250.41635765.davem@redhat.com> To: scott.feldman@intel.com Cc: anton@samba.org, haveblue@us.ibm.com, hdierks@us.ibm.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: References: 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: 1092 Lines: 26 From: "Feldman, Scott" Date: Fri, 13 Jun 2003 16:52:18 -0700 > > 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. > > Rusty and I were wondering why the e1000 didnt do that exact thing. > > Scott: is it possible to enable such a thing? I thought the answer was no, so I double checked with a couple of hardware guys, and the answer is still no. Sigh... So Anton, when the PCI controller gets a set of sub-cacheline word reads from the device, it reads the value from memory once for every one of those words? ROFL, if so... I can't believe they wouldn't put caches on the PCI controller for this, at least a one-behind that snoops the bus :( - 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/