Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754301AbWKICnt (ORCPT ); Wed, 8 Nov 2006 21:43:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753555AbWKICnt (ORCPT ); Wed, 8 Nov 2006 21:43:49 -0500 Received: from dsl027-180-168.sfo1.dsl.speakeasy.net ([216.27.180.168]:56994 "EHLO sunset.davemloft.net") by vger.kernel.org with ESMTP id S1753543AbWKICns (ORCPT ); Wed, 8 Nov 2006 21:43:48 -0500 Date: Wed, 08 Nov 2006 18:43:53 -0800 (PST) Message-Id: <20061108.184353.106435332.davem@davemloft.net> To: jesse.brandeburg@gmail.com Cc: jmerkey@soleranetworks.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: e1000 driver 2.6.18 - how to waste processor cycles From: David Miller In-Reply-To: <4807377b0611081701i26ee7ce0k1f822dbbe52c2c8@mail.gmail.com> References: <45524E3A.7080301@soleranetworks.com> <4807377b0611081701i26ee7ce0k1f822dbbe52c2c8@mail.gmail.com> X-Mailer: Mew version 4.2 on Emacs 21.4 / 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: 572 Lines: 13 From: "Jesse Brandeburg" Date: Wed, 8 Nov 2006 17:01:44 -0800 > If you can show that it is faster to use pci_dma_sync_single_for_cpu > and friends I'd be glad to take a patch. The problem is if you don't recycle the buffer and really unmap, you'll flush twice. That can potentially be expensive. - 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/