Threaded interrupts and preemption

Chase Douglas chase.douglas at
Tue Apr 13 18:01:52 UTC 2010

On Mon, Apr 12, 2010 at 11:30 PM, Alessio Igor Bogani
<abogani at> wrote:
> 2010/4/13 Chase Douglas <chase.douglas at>:
> [...]
>>>> I think it would be fun to have an
>>>> RT completely preemptible kernel just so we can try it out and have a
> [...]
>>> sudo apt-get install linux-rt
>> As far as I know, our -rt isn't what everyone else means when they say
>> RT. Our rt flavor just has full preemption and a higher tick rate.
>> That's nothing compared to what is in the RT patch set maintained by
>> tglx at The
>> biggest changes that I'm aware of is the default threaded irq handlers
>> and complete preemption in his patch set. Ubuntu kernels since at
>> least Karmic have had threaded irq handlers, but the driver has to be
>> reworked for it.
> You are wrong.
> The linux-rt package, since Feisty Fawn, contains kernel based on Ingo
> Molnar, Thomas Gleixner and others works (that is

I think I was confusing the -rt kernel with the -preempt flavor of the
ubuntu kernel tree. Unfortunately, I see that the linux-rt kernel is
still 2.6.31 in Lucid. Are there any plans for updating this to .33?

-- Chase

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