From owner-freebsd-small Wed Jul 19 22:18:50 2000 Delivered-To: freebsd-small@freebsd.org Received: from wireless.net (wireless.net [207.137.156.159]) by hub.freebsd.org (Postfix) with ESMTP id B906437BB1A for ; Wed, 19 Jul 2000 22:18:46 -0700 (PDT) (envelope-from dbutter@wireless.net) Received: from db.wireless.net (db.wireless.net [209.75.70.101]) by wireless.net (8.9.3/8.9.3) with ESMTP id WAA04280; Wed, 19 Jul 2000 22:15:40 -0700 (PDT) Received: from wireless.net (dbm.wireless.net [192.168.0.2]) by db.wireless.net (8.9.3/8.9.3) with ESMTP id VAA35322; Wed, 19 Jul 2000 21:42:19 -0700 (PDT) (envelope-from dbutter@wireless.net) Message-ID: <3976856E.C83121E2@wireless.net> Date: Wed, 19 Jul 2000 21:51:58 -0700 From: Devin Butterfield X-Mailer: Mozilla 4.73 [en] (X11; I; Linux 2.2.12 i386) X-Accept-Language: en MIME-Version: 1.0 To: Andrzej Bialecki Cc: Brandon Fosdick , freebsd-small@FreeBSD.ORG Subject: Re: Real Time FreeBSD ?? References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-small@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > What kind of RT do you need? Just firm RT scheduling. >You are aware, I suppose, that general > purpose *nix system (such as *BSD an Linux) will never be a real RT > without major changes.... So, the only thing you can get from it is > modified scheduler and interrupt handling, but this buys you oonly so > called "soft-RT"... Yes, for hard realtime we should look at something like QNX. I am mainly interested in having the ability to give a specific process priority scheduling. Something like modified scheduler for Linux by MontaVista Software inc, which does "preemptive" realtime scheduling. You can check it out and download the source from: http://www.mvista.com/realtime/rtsched.html Something like this for FreeBSD would be great. >As I understand, that's what the RTLinux project is > about. And no, there is nothing exactly like this for BSDs, although you > can find a couple of diffrent variations for scheduling algorithms. Well, the RTLinux guys claim to support "Hard" realtime. Do you have any pointers to where to find these algorithms? -- Regards, Devin. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-small" in the body of the message