Esben Nielsen schrieb:
On Mon, 2009-01-19 at 21:45 +0100, Jürgen Mell wrote:
Esben,
I am going to suggest that we use preempt_realtime for a _real_ project
(i.e. costumers will depend on it). We will run on standeard x86 (maybe
x86_64) hardware and will only need serial interfaces for realtime
purposes. Security is not an issue. Which version of preempt_realtime
should I pick?
The latest and greatest *and* most stable version is 2.6.24.7-rt26. As
far as I know (but maybe others know better), there are no unresolved
issues with this "Latest Stable". The kernel release 2.6.24 may not
contain sufficient architecture support for PPC and ARM, but the large
majority of x86 based processors and chipsets is well supported.
Please report, if anything does not work as expected.
The only thing which is missing for me from the 2.6.24.7-rt series is
the patch
"x86-fpu-fix-config_preempt-y-corruption-of-application-s-fpu-stack.patch"
, GIT commit
870568b39064cab2dd971fe57969916036982862 from mainline 2.6.25. This
might cause trouble with applications which are using floating point
arithmetics. Otherwise I am using the 2.6.24.7-rt series on a machine
control for a 16 axes machine and it is working mostly well. There are
only some points where I get big delays (up to some milliseconds) with
my timer routine, where normally delays are below 50 microseconds. Up to
now I could not find the application ( X ??) which is causing this.
Bye,
Jürgen
Which GIT-tree are you refering to?
The patch was included in the standard mainline kernel 2.6.25.
Is there at all an up-to-date GIT repository with preempt realtime?
As far as know, the RT tree is maintained now in a GIT repository, but I
do not know whether it is ready to use already.
Jürgen
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