Re: [Xenomai-core] ... the rt-preempt patch once been in fusion
Hannes Mayer wrote: Ciao Philippe! Philippe Gerum wrote: [...] Clearly not, it is still on the project's agenda, but PREEMPT_RT has been too much of a moving target recently, not to speak of the vanilla 2.6 kernel itself. Recently ? As for Kernel 2.6 there has always been too much development for a stable release IMO, so I still prefer 2.4, but that's a solely personal opinion. On the other hand, 2.6 has been quite stable for me (desktop and devel-stress-testing). I've not talked about instability for 2.6, but rather significant changes in some low-level layers. Incidentally, some of them were triggered by portion of the PREEMPT_RT infrastructure leaking to the vanilla kernel. Unfortunately, this sometimes causes issues you have to deal with when adapting Adeos to each new release. This combo cannot be done overnight, I was not complaining - just curious :-) This work is likely going to start by a test campaign evaluating PREEMPT_RT's and Xeno's nucleus performances in a series of simple and relevant test cases over different ranges of platforms, so that we could Testing ? FWIW, I've just completed another page about the vanilla vs. preempt_rt thing: http://www.captain.at/howto-linux-real-time-patch.php If you have the one or another additional stress test, I'd be more than happy to add it to the page. Ack. Thanks. Thanks and best regards, Hannes. -- Philippe.
Re: [Xenomai-core] ... the rt-preempt patch once been in fusion
Ciao Philippe! Philippe Gerum wrote: [...] Clearly not, it is still on the project's agenda, but PREEMPT_RT has been too much of a moving target recently, not to speak of the vanilla 2.6 kernel itself. Recently ? As for Kernel 2.6 there has always been too much development for a stable release IMO, so I still prefer 2.4, but that's a solely personal opinion. On the other hand, 2.6 has been quite stable for me (desktop and devel-stress-testing). This combo cannot be done overnight, I was not complaining - just curious :-) This work is likely going to start by a test campaign evaluating PREEMPT_RT's and Xeno's nucleus performances in a series of simple and relevant test cases over different ranges of platforms, so that we could Testing ? FWIW, I've just completed another page about the vanilla vs. preempt_rt thing: http://www.captain.at/howto-linux-real-time-patch.php If you have the one or another additional stress test, I'd be more than happy to add it to the page. Thanks and best regards, Hannes.
Re: [Xenomai-core] ... the rt-preempt patch once been in fusion
Hannes Mayer wrote: Ciao Philippe! Philippe Gerum wrote: [...] Clearly not, it is still on the project's agenda, but PREEMPT_RT has been too much of a moving target recently, not to speak of the vanilla 2.6 kernel itself. Recently ? As for Kernel 2.6 there has always been too much development for a stable release IMO, so I still prefer 2.4, but that's a solely personal opinion. On the other hand, 2.6 has been quite stable for me (desktop and devel-stress-testing). I've not talked about instability for 2.6, but rather significant changes in some low-level layers. Incidentally, some of them were triggered by portion of the PREEMPT_RT infrastructure leaking to the vanilla kernel. Unfortunately, this sometimes causes issues you have to deal with when adapting Adeos to each new release. This combo cannot be done overnight, I was not complaining - just curious :-) This work is likely going to start by a test campaign evaluating PREEMPT_RT's and Xeno's nucleus performances in a series of simple and relevant test cases over different ranges of platforms, so that we could Testing ? FWIW, I've just completed another page about the vanilla vs. preempt_rt thing: http://www.captain.at/howto-linux-real-time-patch.php If you have the one or another additional stress test, I'd be more than happy to add it to the page. Ack. Thanks. Thanks and best regards, Hannes. -- Philippe. ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] ... the rt-preempt patch once been in fusion
Hannes Mayer wrote: Hi all! Well, subject says almost all. I remember there has been an effort to make a fusion/rt-preempt patch conglomerate back then. I'm just curious (as I've just been toying with the Molnar patch) - has that thing been dropped in xeno completely ? Clearly not, it is still on the project's agenda, but PREEMPT_RT has been too much of a moving target recently, not to speak of the vanilla 2.6 kernel itself. Even if Xeno's core has not changed in the same proportions, a large refactoring has taken place for 2.1 though. Additionally, PREEMPT_RT's infrastructure has evolved a lot since Xeno was first ported over such kernel, and the way to interface both sub-systems likely needs to be re-thought. This combo cannot be done overnight, but I think that we are getting close to point where it would be possible to rework on this issue. This work is likely going to start by a test campaign evaluating PREEMPT_RT's and Xeno's nucleus performances in a series of simple and relevant test cases over different ranges of platforms, so that we could measure up to which point (and under which condition) the real-time spectrum would be widened by using a combination of both. -- Philippe.
[Xenomai-core] ... the rt-preempt patch once been in fusion
Hi all! Well, subject says almost all. I remember there has been an effort to make a fusion/rt-preempt patch conglomerate back then. I'm just curious (as I've just been toying with the Molnar patch) - has that thing been dropped in xeno completely ? Thanks and best regards, Hannes.
Re: [Xenomai-core] ... the rt-preempt patch once been in fusion
Ciao Philippe! Philippe Gerum wrote: [...] Clearly not, it is still on the project's agenda, but PREEMPT_RT has been too much of a moving target recently, not to speak of the vanilla 2.6 kernel itself. Recently ? As for Kernel 2.6 there has always been too much development for a stable release IMO, so I still prefer 2.4, but that's a solely personal opinion. On the other hand, 2.6 has been quite stable for me (desktop and devel-stress-testing). This combo cannot be done overnight, I was not complaining - just curious :-) This work is likely going to start by a test campaign evaluating PREEMPT_RT's and Xeno's nucleus performances in a series of simple and relevant test cases over different ranges of platforms, so that we could Testing ? FWIW, I've just completed another page about the vanilla vs. preempt_rt thing: http://www.captain.at/howto-linux-real-time-patch.php If you have the one or another additional stress test, I'd be more than happy to add it to the page. Thanks and best regards, Hannes. ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] ... the rt-preempt patch once been in fusion
Hannes Mayer wrote: Hi all! Well, subject says almost all. I remember there has been an effort to make a fusion/rt-preempt patch conglomerate back then. I'm just curious (as I've just been toying with the Molnar patch) - has that thing been dropped in xeno completely ? Clearly not, it is still on the project's agenda, but PREEMPT_RT has been too much of a moving target recently, not to speak of the vanilla 2.6 kernel itself. Even if Xeno's core has not changed in the same proportions, a large refactoring has taken place for 2.1 though. Additionally, PREEMPT_RT's infrastructure has evolved a lot since Xeno was first ported over such kernel, and the way to interface both sub-systems likely needs to be re-thought. This combo cannot be done overnight, but I think that we are getting close to point where it would be possible to rework on this issue. This work is likely going to start by a test campaign evaluating PREEMPT_RT's and Xeno's nucleus performances in a series of simple and relevant test cases over different ranges of platforms, so that we could measure up to which point (and under which condition) the real-time spectrum would be widened by using a combination of both. -- Philippe. ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
[Xenomai-core] ... the rt-preempt patch once been in fusion
Hi all! Well, subject says almost all. I remember there has been an effort to make a fusion/rt-preempt patch conglomerate back then. I'm just curious (as I've just been toying with the Molnar patch) - has that thing been dropped in xeno completely ? Thanks and best regards, Hannes. ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
