From owner-freebsd-realtime@FreeBSD.ORG Thu Sep 21 14:17:00 2006 Return-Path: X-Original-To: freebsd-realtime@freebsd.org Delivered-To: freebsd-realtime@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5DBA816A412 for ; Thu, 21 Sep 2006 14:17:00 +0000 (UTC) (envelope-from dave@godseyfamily.com) Received: from godseyfamily.com (cws-web.com [204.3.218.143]) by mx1.FreeBSD.org (Postfix) with ESMTP id 389E843D5C for ; Thu, 21 Sep 2006 14:16:59 +0000 (GMT) (envelope-from dave@godseyfamily.com) Received: from godseyfamily.com (localhost [127.0.0.1]) by godseyfamily.com (8.13.6.20060614/8.13.6) with ESMTP id k8LEGbPe042798; Thu, 21 Sep 2006 08:16:37 -0600 (MDT) Received: from 134.253.26.10 (proxying for 134.253.224.165) (SquirrelMail authenticated user dave) by godseyfamily.com with HTTP; Thu, 21 Sep 2006 08:16:38 -0600 (MDT) Message-ID: <56166.134.253.26.10.1158848198.squirrel@godseyfamily.com> In-Reply-To: <20060921043423.GA83407@duncan.reilly.home> References: <58304.134.253.26.6.1154383337.squirrel@godseyfamily.com> <200609200841.k8K8faiZ003394@fire.jhs.private> <20060921043423.GA83407@duncan.reilly.home> Date: Thu, 21 Sep 2006 08:16:38 -0600 (MDT) From: "David Godsey" To: "Andrew Reilly" User-Agent: SquirrelMail/1.4.5 [CVS] MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal X-Greylist: Sender e-mail whitelisted, not delayed by milter-greylist-1.5.6 (godseyfamily.com [127.0.0.1]); Thu, 21 Sep 2006 08:16:38 -0600 (MDT) Cc: freebsd-realtime@freebsd.org, "Julian H. Stacey" Subject: Re: Point in the right direction X-BeenThere: freebsd-realtime@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Realtime extensions per POSIX 1003.4" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Sep 2006 14:17:00 -0000 Thanks to all who have replied. I was asking because I was reading about the 6.x kernel and how the big mother of kernel locking was removed in this kernel, so I assumed realtime FreeBSD would be ramping up. Sadly, not a lot of activity in the realtime yet. > On Wed, Sep 20, 2006 at 10:41:36AM +0200, Julian H. Stacey wrote: >> "David Godsey" wrote: >> > So I have been combing the internet for information on realtime >> FreeBSD, >> > but the information is limited. So there must be some more >> information >> > out there, but I do not know where to look. Can someone direct me >> please? >> >> I'd guessed there was also an embedded list but can't see it at >> http://docs.freebsd.org/mail/current/ >> Other lists may have related interests, eg freebsd-small & freebsd-ppc >> NanoBSD (& some other small type keyword I can't remember) may be >> worth searching on > > The fine-grain locking and preemption in 6- and -current > *should* be most of what is required to move towards realtime. > Perhaps throw in a different scheduler for good measure. > Having said that, I don't think that anyone is busy doing any > characterisation of worst-case path lengths and lock-holds, > which is the other side of the equation. > > -- > Andrew > A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. If there are no stupid questions, then what kind of questions do stupid people ask? Do they get smart just in time to ask questions? David Godsey