From owner-freebsd-hackers@FreeBSD.ORG Thu Apr 10 07:09:25 2003 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0D78237B401 for ; Thu, 10 Apr 2003 07:09:25 -0700 (PDT) Received: from srv1.cosmo-project.de (srv1.cosmo-project.de [213.83.6.106]) by mx1.FreeBSD.org (Postfix) with ESMTP id 22AC843F85 for ; Thu, 10 Apr 2003 07:09:23 -0700 (PDT) (envelope-from ticso@cicely9.cicely.de) Received: from cicely5.cicely.de (cicely5.cicely.de [IPv6:3ffe:400:8d0:301:200:92ff:fe9b:20e7]) by srv1.cosmo-project.de (8.12.9/8.12.9) with ESMTP id h3AE99cx086394 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=OK); Thu, 10 Apr 2003 16:09:16 +0200 (CEST) (envelope-from ticso@cicely9.cicely.de) Received: from cicely9.cicely.de (cicely9.cicely.de [IPv6:3ffe:400:8d0:301:210:5aff:fe30:1c1a]) by cicely5.cicely.de (8.12.9/8.12.9) with ESMTP id h3AE95Yi009814 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 10 Apr 2003 16:09:06 +0200 (CEST) (envelope-from ticso@cicely9.cicely.de) Received: from cicely9.cicely.de (localhost [127.0.0.1]) by cicely9.cicely.de (8.12.9/8.12.8) with ESMTP id h3AE94i3098846; Thu, 10 Apr 2003 16:09:04 +0200 (CEST) (envelope-from ticso@cicely9.cicely.de) Received: (from ticso@localhost) by cicely9.cicely.de (8.12.9/8.12.9/Submit) id h3AE8vm9098845; Thu, 10 Apr 2003 16:08:57 +0200 (CEST) (envelope-from ticso) Date: Thu, 10 Apr 2003 16:08:56 +0200 From: Bernd Walter To: Terry Lambert Message-ID: <20030410140855.GP96083@cicely9.cicely.de> References: <20030409114957.GN83126@cicely9.cicely.de> <20030409160038.B658@beagle.fokus.fraunhofer.de> <3E94AD3C.B17D2751@mindspring.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3E94AD3C.B17D2751@mindspring.com> X-Operating-System: FreeBSD cicely9.cicely.de 5.0-CURRENT alpha User-Agent: Mutt/1.5.3i cc: hackers@freebsd.org cc: ticso@cicely.de Subject: Re: realtime problem X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: ticso@cicely.de List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Apr 2003 14:09:25 -0000 On Wed, Apr 09, 2003 at 04:31:08PM -0700, Terry Lambert wrote: > Harti Brandt wrote: > I still recommoned shoving HZ up by over a factor of 10, and the > quantum down by a factor of at least 5 less than the precision > required. That will (almost) guaranteed that you are always in a > loose ballpark around your 1mS deadline, which should be less than > 500uS. You may lose out once in a while, but it shouldn't bee too > often (I assume the thing's not going to be exposed to the Internet > ;^)). Well it depends. I have two options: - start from scratch - start with GPL software In the later case I have to expose... But I believe that I will publish it even in the first case. It's not going to be sold, so I don't have to make any garanties. It's just like burning CDRs - it usually works, but you always know that it may fail if you are out of luck. -- B.Walter BWCT http://www.bwct.de ticso@bwct.de info@bwct.de