From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750908AbWAaOtt (ORCPT ); Tue, 31 Jan 2006 09:49:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750909AbWAaOtt (ORCPT ); Tue, 31 Jan 2006 09:49:49 -0500 Received: from zproxy.gmail.com ([64.233.162.196]:20682 "EHLO zproxy.gmail.com") by vger.kernel.org with ESMTP id S1750888AbWAaOts convert rfc822-to-8bit (ORCPT ); Tue, 31 Jan 2006 09:49:48 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=A7mf8WIWvBfGVLvd+WwiiiXt3dFqwLrt0GOB/Knw89HgiFUIZvUUcruJQm4MgL/kUX9L00DKljrx/BmEqjOHQJo07YwwMdcwY5j6K02kjan/l9W0DY2MltO/8yfqh3sgrCbCy0NX1ZrKkoTpQxNy+ruRPWPeFvNh+CPl/hJdMNg= Message-ID: Date: Tue, 31 Jan 2006 20:19:47 +0530 From: Vinod KK To: linux-kernel@vger.kernel.org Subject: CONFIG_PREEMPT_SOFTIRQS MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, I am using linux 2.6.10 (with Ingo Molnars real time patches) on my mips board. When I try running high network traffic (10% traffic on a 100Mbps link) on my target board with the CONFIG_PREEMPT_DESKTOP=y and CONFIG_PREEMPT_SOFTIRQS=y options enabled I notice that the console freezes and recovers only after the traffic stops. I do not notice this behaviour with the CONFIG_PREEMPT_SOFTIRQS option disabled. I understand that the CONFIG_PREEMPT_SOFTIRQS option puts all softirq processing to the ksoftirqd daemon, but i do not see why this should stall the console. I believe there should be some task which is starving for CPU, but I do not know which one. The console is on an 16550 serial port. Could someone please give me some pointers on where I should start looking? Thanks, Vinod K.