Subject: Re: Real Time O.S vs 'conventional' one.
To: Marcin Jessa <>
From: Stefan 'Kaishakunin' Schumacher <>
List: tech-net
Date: 10/26/2005 13:17:52
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Also sprach Marcin Jessa (
> I have embedded boards which I want to use as acess points for WLAN
> infrastructure.
> The choice is between NetBSD and Real Time Linux.
> What I am wondering about is if there is any advantage using real
> time O.S on wireless enviroment.=20

A RTOS is an OS designed to meet time constraints and optimized
prediction of process behaviour. It is not necessarily designed to be
as fast as possible.=20

> Would one gain anything speedwise using RTOS ?

That can't usually be predicted. An RTOS doesn't need to be faster
than a normal one, it just has to meet it's timing constraints.=20

BTW: I had to use RT-Linux in a course on RT programming (scheduling,
semaphores, Dining philosophers problem and so on) and learned that
RTLinux is just a bunch of wild hacks to get some kind of RT into the
Kernel. It was running on a normal Linuxkernel[1] and therefor, it wasn't a
real hard RTOS. As what I know from electrical engineering, all hard
RTOS are specifically designed for a task or device. Bringing hard
RTOS to a Unix is IMHO almost unsolvable.=20

So my advice is NetBSD, don't forget, it holds the Internet2 Land
Speed Record[2] :-)

[1] at least in our Lab
PGP FPR: CF74 D5F2 4871 3E5C FFFE 0130 11F4 C41E B3FB AE33
Der Geist des Kriegers sollte mit Beginn des Neujahrstages bis zum Ende=20
des Jahres vom Gedanken an seinen Tod beherrscht werden.

Daijouji Shigesuke in "Budo Shoshin Shuu"

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