Bernhard Kuhn wrote:
>
> al lykken wrote:
>
> > The problem is that when another process is started, any access to disk,
> > etc I blow my frame, where I get burps out to 10 - 30ms.
>
> IMHO, 30 ms is rather good for a non rt-kernel :-)
>
> If 1 ms is good enough for your application, then
> somewhat like Linux/RT (AKA Linux/RK, see www.timesys.com, Hi Raj!)
> or KU-RT (http://www.ittc.ukans.edu/kurt/, Hi, Douglas!) would fit
> your needs. As these projects (indended for x86, AFAIK) are just
> modifing the kernel-scheduler, there is at least a good chance
> that they could apply to PPC as well ...
>
> Another chance: have a look at
> http://people.redhat.com/mingo/lowlatency-patches/
> http://people.redhat.com/mingo/scheduler-patches/
>
> Sounds good, but don�t ask me what these patches
> are doing :-)
>
> Next posibility: give RTL3.0 a chance, get the source code,
> modifiy it, until it fits you needs and send the patches
> back to Victor :-)
> BTW: is RTL3.0 for PPC ready for SMP?
>
> The last Chance would result in a new real-time project:
>
> A year ago, me and some (former) collegues had
> the following idea: on an SMP machine, Linux could
> run in non-SMP-mode on one processor, while
> RTEMS is using the other processor. Depending
> on the application, the whole RTEMS-stuff would
> fit into 512 KByte of memory, an thus fitting
> completly into the L2-Cache of a Pentium II.
>
> We played around a little bit and succeeded to
> start a simple program (toggling bits on the
> parallel-port) on the second processor,
> while linux was running on the first.
> We just had to modify about 40 lines in the
> Kernel to do so ...
>
> If there are enough people out there, interessted
> in that idea, we could revival the project.
> (AFAIR, RTEMS runs on PPC as well).
I am interested, altough for x86 not PowerPC.
- Erwin
>
> Bernhard
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