From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 22 May 2002 05:29:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 22 May 2002 05:29:03 -0400 Received: from pluvier.ens-lyon.fr ([140.77.167.5]:41403 "EHLO pluvier") by vger.kernel.org with ESMTP id ; Wed, 22 May 2002 05:29:02 -0400 Date: Wed, 22 May 2002 11:31:40 +0200 From: Eric Lemoine To: linux-kernel@vger.kernel.org Subject: i8259 and IO-APIC Message-ID: <20020522093139.GA390@hookipa> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.28i X-Warning: return path set from From: address Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I already asked this question but did not get any responses. Please condider answering. Using the old i8259 interrupts controller, my 1-way Linux2.4.16 box livelocks when receiving a high rate UDP flow (interrupt rate is so high that the NET_RX_SOFTIRQ never gets the chance to pull the packets off the backlog queue). However, the receive livelock phenomenom completely disappears when making use of the IO-APIC. Does anyone have an explanation for this? TIA -- Eric