linux-kernel - Re: Minimum time slice for relaible Linux execution

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Message-ID: <BANLkTimoubhOk3tDwzgAek644C0AUCxN4w@mail.gmail.com>
Date:	Fri, 1 Apr 2011 09:57:12 -0500
From:	Rafael Fernandez <rafaelefernandez@...il.com>
To:	limp <johnkyr83@...mail.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Minimum time slice for relaible Linux execution

Also, how is this different than placing a starvation limit around the
RT set of tasks?

On Fri, Apr 1, 2011 at 9:19 AM, Rafael Fernandez
<rafaelefernandez@...il.com> wrote:
> Hi,
>
> This is pretty interesting to me. How would your framework handle an
> RT application that does quite a bit of I/O? Does it block and go to
> Linux, get serviced, and come back?
>
> Thank you,
> Rafael
>
> On Thu, Mar 31, 2011 at 7:13 AM, limp <johnkyr83@...mail.com> wrote:
>> Dear all,
>>
>> I have developed a framework similar to a hypervisor that switches between
>> Linux and a RT domain.
>> As RT priority is of highest importance, I want to give more time to the RT
>> domain *but* I also want to give Linux adequate time for being able to
>> operate.
>>
>> Could anyone advise me on how to determine the minimum possible time slice
>> that I can give to Linux so that it doesn't crash?
>>
>> That is, if I periodically execute my RT domain every ms and then I switch
>> to Linux, what's the minimum time that should be given to Linux, until the
>> next RT domain execution?
>>
>> NOTE: The RT domain and Linux are not executed concurrently, i.e. the RT
>> domain is executed first and then Linux executes until the next RT domain
>> execution.
>>
>> Thank you all in advance.
>>
>> John K.
>>
>>
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>



-- 
Rafael E. Fernández
B.S. Computer Science
University of Illinois at Urbana-Champaign
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