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

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Message-ID: <BANLkTimpKhzHsZFSVrsZckfDQZ2GFwN1kw@mail.gmail.com>
Date:	Fri, 1 Apr 2011 09:19:28 -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

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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