From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264770AbUEKOoY (ORCPT ); Tue, 11 May 2004 10:44:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264772AbUEKOoY (ORCPT ); Tue, 11 May 2004 10:44:24 -0400 Received: from terra.inf.ufsc.br ([150.162.60.10]:53730 "EHLO terra.inf.ufsc.br") by vger.kernel.org with ESMTP id S264770AbUEKOoW (ORCPT ); Tue, 11 May 2004 10:44:22 -0400 Message-ID: <40A0E808.2020602@inf.ufsc.br> Date: Tue, 11 May 2004 11:49:44 -0300 From: Thiago Robert User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040113 X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Write-combining Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello there! Is there an easy way to be sure about wether the PCI write-combining is enabled or not for a given memory region? I'm writting user-level communication software for a Myrinet network. I use Write PIO and I'm aware that WPIO performance is greatly influencied by the presence of write combining. Based on the performance I measured I can only conclude that Write Combining is enabled but I would like to be sure about it (since I'm planning to publish my research). Is the default behaviour of the Linux kernel to enable write-combining? How can I be sure if it is enabled or not? Thanks in advance. __________________________ Thiago Robert