[PD] [OT] linux preempt kernel vs rt kernel

András Murányi muranyia at gmail.com
Wed Jun 30 14:29:29 CEST 2010

Buh, it seems then i'll need to get a kernel from a PPA or compile it
myself. A bit afraid of it, honestly.
Thanks for the explanation!


On Sat, Jun 26, 2010 at 12:50 PM, Ricardo Lameiro
<ricardolameiro at gmail.com>wrote:

> well, AFAIK, the "RT" Kernel is a generic kernel that is modified by a
> special patch, that is made by Ingo Molnár. This patch gives the kernel the
> ability to have a behavior that allows the assignment of time frames and
> allocations to compute "rt" flagged tasks. Maybe this could be translated to
> the scheduler.In the other hand, the preemptive kernel, its a normal Generic
> kernel, that its compiled with different options. At compile time, the
> configuration of the scheduler and company are configured more aggressively
> to give a better response to the "rt" flagged apps.
> As my opinion, that is worth nothing...., the preemptive kernels are
> comming into a very good level, since the main tree ot the generic kernel,
> has absorbing parts of Ingo's patches. But, still, the RT kernel is way more
> accurate on the scheduling etc. problem is that, RT kernels are in nature
> more Power hungry, and by the nature of its working, they could hang easily
> a computer, keeping only processing an high prio task.
> If I said something wrong, please correct me, I have looked at this stuff
> since a year to try to understand it better, so if someone can explain it
> better, please do.
> Ricardo Lameiro
> 2010/6/26 Andre "Osku" Schmidt <andre.osku.schmidt at osku.de>
> On Fri, 2010-06-25 at 22:17 +0200, András Murányi wrote:
>> > Hello people,
>> >
>> > does anyone know what is the real difference between an 'rt' and a
>> > 'preempt' kernel in linux?
>> dunno, but here's a pretty interesting talk about real-time kernel
>> http://lac.linuxaudio.org/2010/recordings/day2_1045_How_the_Real_Time_Kernel_Helps_Audio_and_Video_Applications.ogv
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