Supplemental Kernel Patch vs. Generic Kernel

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1.RTAI vs RTLinuxFree vs 2.6 Kernel + RT Pre-emption patch

So, which one is best? :)
I am new to RT development, and have been assigned the task of
determining the "best" RT on Linux strategy for an embedded control
system on an industrial machine - we are definitely wanting to use an
"On Linux" method, as there are several other, non-RT tasks/services
that this system will do/provide - the RT task, while it is the *most*
important thing that this system will be doing (triggering/capturing
data samples via serial port), will be one of the *least* system
resource-intensive processes that run on this embedded system. Other
services (all non-RT) will include database, live video stream
capture/re-package/re-transmit, UDP broadcasting of custom data
packets, and TCP/IP network routing between an external network and the
machine-internal network.

I have been researching all 3 options for about 1 week (full time) now,
and I have not found any comprehensive, *recent*
comparisons/testimonials/benchmarks that involve the latest
versions/capabilities of the 3 possibilities.

Thanks for the assistance!

-James

2.self compiled kernels vs vendor kernels

On Thu, 17 Jul 2003 14:53:47 +1200, max barwell wrote:

> I am using Debian but I think this is probably relevant to all distros.
> 
> Lately I wanted to add a patch to the kernel, so I got the 2.4.21 source
> added my patch, copied the same .config as supplied with the debian kernel
> I was already using, and off I went.
> 
> Well would this kernel compile? no it would not, it always balked
> somewhere, usually at things I've never heard of or need luckily, the
> ambassador atm driver etc.
> 
> So after a few tries and a few things removed it compiled, So my question
> is, obviously a vendor distributed kernel needs everything under the sun
> in there to support a wide variety of hardware configurations, but why can
> I not compile a kernel myself using their .config, do they do some
magic?

Well, for one they did not use the patch you applied.  That may be the
cause, but also that "ambassador atm driver" is rather mysterious.  

But _why_ would you compile a kernel to match a distribution kernel that
has support for everything ever invented?  Read the README and run "make
menuconfig" or your preference.  That will walk you through the process of
compiling a kernel for your needs.

-- 

David L. Johnson

   __o   | Become MicroSoft-free forever.  Ask me how.  
 _`\(,_  | 
(_)/ (_) | 
           

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