From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933372AbXDCIvl (ORCPT ); Tue, 3 Apr 2007 04:51:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933307AbXDCIvl (ORCPT ); Tue, 3 Apr 2007 04:51:41 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:42925 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933372AbXDCIvj (ORCPT ); Tue, 3 Apr 2007 04:51:39 -0400 Date: Tue, 3 Apr 2007 10:51:32 +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: <20070403085132.GA15344@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=3.0.3 -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: > > there are a few other things i'm working on to improve this. I've > > uploaded -rt9 which is the current state of affairs. Note that using > > -rt9 you'll likely only see IRQ-8406 overhead in the system, because > > i've added an optimization to do process the softirq-net-tx workload > > in the hardirq thread if the priority of the two is the same (which > > is the default behavior). But -rt9 is still work in progress that is > > not fully finished yet: in some cases i'm seeing 'fluctuating > > performance' problems on forcedeth that werent there before. > > I tried -rt9 and saw some odd 'fluctuating performance'. I'll try it > again tomorrow when I am much closer to the box's power button. could you try -rt10? I've improved hardirq/softirq threading performance some more, and have tuned the forcedeth driver too. Ingo