From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753409AbXDCGnN (ORCPT ); Tue, 3 Apr 2007 02:43:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753403AbXDCGnN (ORCPT ); Tue, 3 Apr 2007 02:43:13 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:50735 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753309AbXDCGnM (ORCPT ); Tue, 3 Apr 2007 02:43:12 -0400 Date: Tue, 3 Apr 2007 08:43:04 +0200 From: Ingo Molnar To: David Sperry Cc: "'dave_sperry@ieee.org'" , linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Poor UDP performance using 2.6.21-rc5-rt5 Message-ID: <20070403064304.GA17938@elte.hu> References: <20070402190445.GB2081@elte.hu> <001d01c77584$6a92ffe0$7901a8c0@dad> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <001d01c77584$6a92ffe0$7901a8c0@dad> User-Agent: Mutt/1.4.2.2i X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.1.7 -2.0 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * David Sperry wrote: > > > I think there is some kind of bad behavior happening in the Nvidia > > > driver with respect to softirq-net-tx and IRQ-8406. > > > > yes. Part of the problem is that the forcedeth.c driver does not > > fully support NAPI - today i've implemented those bits (see them > > below), based on your testcase. The other part is that the Intel NIC > > uses MSI, while foredeth uses fasteoi, correct? [you can see this in > > /proc/interrupts] > > In my case forcedeth seems to be picking up MSI for eth2 & eth3 > Could this be part of my problem? i dont think it should be a problem. Ingo