Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262656AbTE0GAD (ORCPT ); Tue, 27 May 2003 02:00:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262671AbTE0GAD (ORCPT ); Tue, 27 May 2003 02:00:03 -0400 Received: from pizda.ninka.net ([216.101.162.242]:19601 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id S262656AbTE0GAC (ORCPT ); Tue, 27 May 2003 02:00:02 -0400 Date: Mon, 26 May 2003 23:11:20 -0700 (PDT) Message-Id: <20030526.231120.26504389.davem@redhat.com> To: andrea@suse.de Cc: akpm@digeo.com, davidsen@tmr.com, haveblue@us.ibm.com, habanero@us.ibm.com, mbligh@aracnet.com, linux-kernel@vger.kernel.org Subject: Re: userspace irq balancer From: "David S. Miller" In-Reply-To: <20030527012617.GH3767@dualathlon.random> References: <20030527010903.GF3767@dualathlon.random> <20030526.181309.02272953.davem@redhat.com> <20030527012617.GH3767@dualathlon.random> 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: 760 Lines: 18 From: Andrea Arcangeli Date: Tue, 27 May 2003 03:26:17 +0200 I argue with that, NAPI needs to poll somehow, either you hook into the kernel slowing down every single schedule, or you need to offload this work to a kernel thread. You've never shown what this "offloading work to a kernel thread" actually accomplishes. What I've seen it do is decrease the amount of total softirq work that cpu can get done. And avoiding ksoftirqd actually running makes performance get better. - 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/