[PD] [OT] linux preempt kernel vs rt kernel
pedro.lopes at ist.utl.pt
Wed Jun 30 20:46:50 CEST 2010
Of course not. Its a pacth - no compiling needed. But be sure to keep a
generic kernel at the boot (just use grub to preserve a boot without rt, I
never had problems and use the same rt kernel for 1 year, but safety first
Real time (-rt) and Low latency (-lowlatency) kernels
You may want to install the -lowlatency kernel, you can simply do:
sudo apt-get install linux-lowlatency linux-headers-lowlatency
If you still experience Xruns or you have a firewire sound card supported by
the FFADO project, you may want to install the -rt kernel:
sudo apt-get install linux-rt linux-headers-rt
2010/6/30 András Murányi <muranyia at gmail.com>
> 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
>>> Pd-list at iem.at mailing list
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contacto: jazz at radiozero.pt
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