* xenomai supported_cpus
@ 2021-07-29 8:51 John Ho
2021-07-29 9:01 ` Jan Kiszka
0 siblings, 1 reply; 3+ messages in thread
From: John Ho @ 2021-07-29 8:51 UTC (permalink / raw)
To: xenomai
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
yours sincerely,
John
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: xenomai supported_cpus
2021-07-29 8:51 xenomai supported_cpus John Ho
@ 2021-07-29 9:01 ` Jan Kiszka
2021-07-30 11:22 ` John Ho
0 siblings, 1 reply; 3+ messages in thread
From: Jan Kiszka @ 2021-07-29 9:01 UTC (permalink / raw)
To: John Ho, xenomai
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: xenomai supported_cpus
2021-07-29 9:01 ` Jan Kiszka
@ 2021-07-30 11:22 ` John Ho
0 siblings, 0 replies; 3+ messages in thread
From: John Ho @ 2021-07-30 11:22 UTC (permalink / raw)
To: Jan Kiszka, xenomai
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
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-07-30 11:22 UTC | newest]
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2021-07-29 8:51 xenomai supported_cpus John Ho
2021-07-29 9:01 ` Jan Kiszka
2021-07-30 11:22 ` John Ho
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