Re: Why is Linux not RTOS?

["K.R. Foley" <kr@cybsft.com>]

Rodrigo Rubira Branco wrote:
> Ok, let's clarify somethings ;)

Please don't top post.

> 
> 
> First of all I really recommend this links:
> http://www.linuxjournal.com/article/9361
> http://rt.wiki.kernel.org/
> 
> The real-time implementations previously commented in the list relies on
> "interrupt shielding" (forcing interrupts to run on a reserved CPU) and
> "CPU pinning" (forcing real-time tasks to only run on a CPU which
> doesn't run any other tasks), so we can't say it's a 'real' real-time ;)
> (it does not take the best advantage of multiple cpu's for example and
> needs more than just one in anyway).

The above description is inaccurate when talking about about Ingo
Molnar's PREEMPT_RT or Real-Time patch. The -rt patchset, as it is also
called, takes full advantage of SMP capabilities for both interrupts and
Real-Time tasks.

> 
> Legal notice: It's just my personal contribution.
> 
> 
> P.S.:  Sorry my delay to answer that ;)
> 
> 
> On Thu, 2007-04-05 at 15:37 +0530, Raseel Bhagat wrote:
>> Hi Tzahi,
>>
>> On 4/5/07, Tzahi Fadida <Tzahi.ML2@gmail.com> wrote:
>>> What is this i hear about PREEMT_RT from VirtualLogix:
>>> http://www.wirelessiq.com/content/newsfeed/9867.html
>> I think the author is trying to mention the different innovative
>> solutions to the latency issue in the GPOS Linux Kernel. PREEMPT_RT ,
>> IIRC  was a Real Time patch by Ingo Molar.
>> VirtualLogix's Virtual OS is another such solution, etc.
>>
>> Thanks,
>> Raseel
>> -
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-- 
	kr

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