Real Time Linux Overview

On Sat, 22 Jan 2000, Alan Locke wrote:

> Dave West wrote:
> >What net traffic? What disk activity? The only thing this box will do is
> >what it needs to do in pursuance of the task of controlling the machine
> >(Anybody that hangs a control system network off the normal day to day
> >office network is a serious idiot and I would not employ them.
>
> I'm not sure that Phil was talking about net activity on an office network.
> There are control systems that use ethernet for HMI comminications as well as
> traffic to lower speed I/O. There's also been on and off discussions about
> using the machine disk for data persistence reasons (I'm not advocating this
> position here though).
>
> On another subject, let's keep a level of courtesy in our discussions please.
> If I were Phil, I might read your post as calling him a serious idiot that
> should not be employed in a field in which he no doubt sucessfully employed
> If you have a point, there is no reason to make it in a potentially offensive
> manner - it only reduces the impact of your point. All of us here are
> volunteers after all and deserve to be respected.

Erm, yes well, It was never my intention to infer anything like that and I apologise for any offence I may have caused (Just a little stress creeping in).

The point I was trying to make regarding net activity and disk activity is that none of it should be unsolicited and should therefore be handleable.

Again I apologise to anyone my style may have offended but it is simply that. My style is somewhat agressive and I find it works best because it provokes people to state their point clearly and then I learn something.

Dave West E-Mail: [email protected]
Semiras Projects Ltd. PGP public key available on request.


_______________________________________________
LinuxPLC mailing list
[email protected]
http://linuxplc.org/mailman/listinfo/linuxplc
 
On Mon Jan 24 09:01:31 2000 Dave West wrote...
>
>Again I apologise to anyone my style may have offended but it is simply
>that. My style is somewhat agressive and I find it works best because it
>provokes people to state there point clearly and then I learn something.
>

It's style like yours that will move this project past the vaporware stage. Keep it up.

--
Stan Brown [email protected] 843-745-3154
Westvaco
Charleston SC.
--

_______________________________________________
LinuxPLC mailing list
[email protected]
http://linuxplc.org/mailman/listinfo/linuxplc
 
J

Johan Bengtsson

Sounds like a good road. We definitely don't need real time to get a basic system going. KURT sounds to me (at the moment) like the road to go when we finally need RT, and most of the coding is probably unaffected by the change.


/Johan Bengtsson

----------------------------------------
P&L, the Academy of Automation
Box 252, S-281 23 H{ssleholm SWEDEN
Tel: +46 451 49 460, Fax: +46 451 89 833
E-mail: [email protected]
Internet: http://www.pol.se/
----------------------------------------


-----Original Message-----
From: MIME :[email protected] [SMTP:MIME :[email protected]]
Sent: Saturday, January 22, 2000 11:04 PM
On Sat Jan 22 05:40:46 2000 Dave West wrote...
>
Excellent synopsis of the position for not needing real time extensions
in V1.0 snipped.
>
>If I have missed something in my scanning of the kernel code that will
>affect this can you please advise me. The worst thing I can see is where
>the kernel may go and sit in the system idle process for 10 msec in which
>case that would be a serious kernel bug.
>

Thanks Dave. You have done a great job of summarizing what I think is the correct position on this. I strongly support this portion.

Now I don;t want to discourage the supporters of real time extensions. here is what I suggest that we do.

1. Make a determination of which version of real time extensions best suits our project (KURT?).

2. Stay on top of the design as it proceeds, keeping an eagle eye out for places where bad decisions are in danger of being made vis a vi adding in the appropriate real time extensions.

If we can agree on this, we can proceed with the design and implementation of the first version of this project.

I would remind people that we have been talking about this project for 2 weeks now, and have not actually started doing any real work. Now people have a pretty limited attention span, without seeing some results. I suspect we are fast approaching that.

Remember, one of the Linux philosophies is "release early and often".

Lets see if we can all agree on a design, and start coding, right?



_______________________________________________
LinuxPLC mailing list
[email protected]
http://linuxplc.org
 
J

Johan Bengtsson

My computer at home will not be dedicated to this project. I do however not have anything against running a hacked kernel...

/Johan Bengtsson

----------------------------------------
P&L, the Academy of Automation
Box 252, S-281 23 H{ssleholm SWEDEN
Tel: +46 451 49 460, Fax: +46 451 89 833
E-mail: [email protected]
Internet: http://www.pol.se/
----------------------------------------


_______________________________________________
LinuxPLC mailing list
[email protected]
http://linuxplc.org/mailman/listinfo/linuxplc
 
Top