From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262570AbVFLNkc (ORCPT ); Sun, 12 Jun 2005 09:40:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262596AbVFLNkc (ORCPT ); Sun, 12 Jun 2005 09:40:32 -0400 Received: from vms044pub.verizon.net ([206.46.252.44]:37291 "EHLO vms044pub.verizon.net") by vger.kernel.org with ESMTP id S262570AbVFLNkY (ORCPT ); Sun, 12 Jun 2005 09:40:24 -0400 Date: Sun, 12 Jun 2005 09:40:11 -0400 From: Gene Heskett Subject: Re: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00 In-reply-to: <20050612103513.GA10808@elte.hu> To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Peter Zijlstra , "Eugeny S. Mints" , Daniel Walker Message-id: <200506120940.11698.gene.heskett@verizon.net> Organization: None, usuallly detectable by casual observers MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit Content-disposition: inline References: <20050608112801.GA31084@elte.hu> <200506120502.01752.gene.heskett@verizon.net> <20050612103513.GA10808@elte.hu> User-Agent: KMail/1.7 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sunday 12 June 2005 06:35, Ingo Molnar wrote: >* Gene Heskett wrote: >> Glitch reports as they develop of course. >> >> Q: Whats the diff between turning on hardirq's in mode 3, and mode >> 4? > >well, "mode 3" is PREEMPT_DESKTOP - normal CONFIG_PREEMPT on the >mainstream kernel. If you turn on hardirq/softirq threading then you > can e.g. chprio your sound IRQ to have better audio latencies. It > will cause runtime overhead though. On "mode 4" (PREEMPT_RT) > hardirq/softirq threading is mandatory (due to the processing > model). > > Ingo I think I see. Do you have a swag as to how much runtime overhead using softirq's only might cause? My normal seti production is about 7 per day, and it seems to have dropped to about 6 while running the RT versions. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) 99.35% setiathome rank, not too shabby for a WV hillbilly Yahoo.com and AOL/TW attorneys please note, additions to the above message by Gene Heskett are: Copyright 2005 by Maurice Eugene Heskett, all rights reserved.