Christophe -

Am 06.05.2013 um 11:16 schrieb Christophe Grellier <[email protected]>:
> 
> So I installed a Debian Wheezy with the rt_preempt kernel

> So my main question is : what version of LinuxCNC can I install ?
> - the stable 2.5.2 ? From what I understood, it is RTAI-only.

wont help you - as you say: RTAI only

> - master branch ?

same thing

> - rtos-integration-preview3 ?

or its master equivalent rtos-integration-preview3-merged-into-master

> I am looking for something pretty stable, that can work with the 
> rt_preempt kernel.

I think these branches are quite stable.

> 
> Would I gain anything at using a xenomai or rtai kernel that have better 
> latency numbers ?

Yes, RTAI and Xenomai have significantly better latency behaviour than 
RT-PREEMPT. I think this is relevant mostly for software stepgen setups,

> The new version that will run with multiple rt kernels looks like a 
> major step forward. Shouldn't this upcoming version be granted a 
> "LinuxCNC 3.0" name ?

Actually I dont think so, since this work changes internal plumbing, but next 
to nothing at the user level; plus version numbers arent a reward system - at 
least my ego will come out unchanged visavis the version number eventually 
chosen ;)

There will be a more radically reworked version later this year which does away 
with NML and enables a split of RT (HAL/RTAPI/motion) and non-RT (UI, 
interpreter, task) onto different machines and hence possibly different 
architectures; that includes a 'non-PC' option for the non-RT part. That 
probably warrants a major number change.

- Michael


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