Threaded interrupts and preemption

Chase Douglas chase.douglas at
Tue Apr 13 18:21:04 UTC 2010

On Tue, Apr 13, 2010 at 11:01 AM, Chase Douglas
<chase.douglas at> wrote:
> 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?

Also, where's the source for the -rt kernel? I'm having a hard time
finding it. The linux-meta-rt package seems to have just some of the
debian packaging, but no source or patches.

-- Chase

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