Date: Wed, 19 Jul 2000 21:51:58 -0700 From: Devin Butterfield <dbutter@wireless.net> To: Andrzej Bialecki <abial@webgiro.com> Cc: Brandon Fosdick <bfoz@glue.umd.edu>, freebsd-small@FreeBSD.ORG Subject: Re: Real Time FreeBSD ?? Message-ID: <3976856E.C83121E2@wireless.net> References: <Pine.BSF.4.20.0007200149550.8223-100000@mx.webgiro.com>
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> 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
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