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Subject: Re: FreeBSD as a real-time solution?
In-Reply-To: <3916FE19.DF7E47C4@tdnet.com.br> from Gustavo Vieira Goncalves Coelho Rios at "May 8, 2000 05:49:13 pm"
To: kernel@tdnet.com.br (Gustavo Vieira Goncalves Coelho Rios)
Date: Mon, 8 May 2000 18:00:36 -0300 (EST)
Cc: clabrown@granitepost.com (Clarence Brown),
	freebsd-questions@freebsd.org
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Maybe that will be better discussed in advocacy...

Ata.

> Clarence Brown wrote:
> > 
> > I'm not a FreeBSD expert, but in "Dr. Dobb's Journal" #310 March 2000
> > (www.ddj.com) there is an article title "Real-Time Linux" that discusses 2
> > projects to bring real time to Linux. Perhaps these might also be applied to
> > FreeBSD?
> > 
> > Also, define "precise time measurements". What is the rate and granularity
> > that you need? If your DOS system is "working", why do you want to "fix" it?
> > <grin>
> > 
> > Mentioned in the article:
> > 
> > RTLinux
> > at http://www.rtlinux.org,
> > 
> > Real Time Application Interface, (an offshoot of RTLinux with better
> > timers?)
> > at http://www.aero.polimi.it/projects/rtai
> > 
> > Cla.
> 
> 
> The solutions for real-time needs should be design from scratch!
> Where linux designed to be  real time OS? I guess no! Real Time solution
> requires a total different approach than the classic kernel model used
> by Free/Open/Linux, etc......
> 
> That's not only the point! What about the correctness of the code? How
> can prove that it kernel is full deterministc ? Is FreeBSD/Linux Full
> deterministc? If Linux/BSD do manage garbage collection, it's not full
> deterministc. What happens if you have to service to a serial port
> request and the kernel is performming memory related actions! Garbage
> collection cannot be interruped! You lose the information that's
> arriving at the serial port........
> 
> linux were not desgined to be reail time! So, don't use it.
> Again: try something like QNX/Neutrino (http://www.qnx.com)
> 
> 
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