From owner-freebsd-realtime@FreeBSD.ORG Thu Sep 21 04:35:45 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 23A8016A40F for ; Thu, 21 Sep 2006 04:35:45 +0000 (UTC) (envelope-from andrew@areilly.bpa.nu) Received: from omta05sl.mx.bigpond.com (omta05sl.mx.bigpond.com [144.140.93.195]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5A0DD43D45 for ; Thu, 21 Sep 2006 04:35:43 +0000 (GMT) (envelope-from andrew@areilly.bpa.nu) Received: from areilly.bpa.nu ([141.168.7.22]) by omta05sl.mx.bigpond.com with ESMTP id <20060921043540.BIHU15497.omta05sl.mx.bigpond.com@areilly.bpa.nu> for ; Thu, 21 Sep 2006 04:35:40 +0000 Received: (qmail 86723 invoked by uid 501); 21 Sep 2006 04:34:23 -0000 Date: Thu, 21 Sep 2006 14:34:23 +1000 From: Andrew Reilly To: "Julian H. Stacey" Message-ID: <20060921043423.GA83407@duncan.reilly.home> References: <58304.134.253.26.6.1154383337.squirrel@godseyfamily.com> <200609200841.k8K8faiZ003394@fire.jhs.private> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200609200841.k8K8faiZ003394@fire.jhs.private> User-Agent: Mutt/1.4.2.2i Cc: freebsd-realtime@freebsd.org 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 04:35:45 -0000 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