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From: John Ho <johnho26@gmail.com>
Date: Fri, 30 Jul 2021 13:22:21 +0200
Message-ID: <CAMjL99KhH4cJPACwcV_DnGWft7Hay9QBvb6ybYmOED=Z40MWog@mail.gmail.com>
Subject: Re: xenomai supported_cpus
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To: Jan Kiszka <jan.kiszka@siemens.com>, xenomai@xenomai.org

thank you Jan,
I will look into it and hopefully create a documentation soon!

yours sincerely,
John

On Thu, Jul 29, 2021 at 11:01 AM Jan Kiszka <jan.kiszka@siemens.com> wrote:

> On 29.07.21 10:51, John Ho via Xenomai wrote:
> > Hi all, I wish to ask about core isolation, and how to define the grub
> > command line with regards to supported_cpus. As of right now, I have done
> > the isolcpus and singled out Core 2-5 for xenomai, however, as for
> > xenomai.supported_cpus, I am unsure what value I am supposed to put into
> > the grub. Is there any documentation on this, so that I can adjust the
> > value to this 4 cores?  Will appreciate any help with this
>
> There is unfortunately no proper documentation. Feel free to add one,
> likely to doc/asciidoc/README.INSTALL.adoc.
>
> supported_cpus is a bitmask (in contrast to isolcpus, unfortunately).
> So, to limit Xenomai to CPU 2-5, you need to specify 0x3c.
>
> Jan
>
> --
> Siemens AG, T RDA IOT
> Corporate Competence Center Embedded Linux
>