Re: RT linux

[David Kline <dkline@aps.anl.gov>]

hallo,

Emmanuel Mayssat wrote:

Hello,

I was wondering what would justify moving to RT linux?
  

it's free....

I was actually contemplating doing the move to RT myself, but finally
decided against it.

All RT-required feedback/acquisition/etc are implemented in
hardware/electronics. As a result, my IOCs don't have to react
Real-Time.

But could you describe a "real" situation where RT is necessary? 
Maybe if you have an IOC which is connected to a device that generate
hardware interrupts, etc. but so far I never encountered such a device.
  

using the standard linux kernel with the osadl patch addresses interrupt latency issues. i was particularly
interested in that. on the ebrick, i'm using hardware interrupts from the oms pc78-46 module to signal
when a motor is done, and other modules supported by the ebrick.

Thanks,

--
E

On Mon, 2007-09-10 at 05:59 -0500, David Kline wrote:
  

you can use >=2.6.18 linux kernel/w patch from osadl 
(http://www.osadl.org/). that will give you rt behavior.
/david

Heinrich du Toit wrote:
    

Hi

Did somebody else out there use RTLinux for EPICS?

-Heinrich

  
      

-- 

+-------------------------------------------------+
David M. Kline                   dkline@aps.anl.gov
Beamline Controls and Data Acquisition (BCDA)
Argonne National Laboratory, Advanced Photon Source
Argonne IL, 60439                      630.252.8639
   ---------------------------------------------
                   Beamlines R Us
+-------------------------------------------------+