[Xenomai-help] Xenomai patched SMP kernel and "nosmp" kernel parameter

[Xenomai-help] Xenomai patched SMP kernel and "nosmp" kernel parameter

[M. Koehrer]

Hi everybody,

I have a SMP kernel 2.6.17.7 on a Dual Core Pentium 4 running.
SMP is enabled at the kernel configuration.
This works fine.
However, I want to compare UP with SMP operation, that's why
I want to boot the system with the "nosmp" kernel parameter.
However, booting of the PC with  nosmp does not work.
First it starts fine, however when trying to access hdb (which is the CD ROM
drive in my system) to get info about it, the message
"hdb: lost interrupt"
appears, and booting is stopped. 

Does the nosmp parameter work with a Xenomai patched kernel?
Or what could be wrong with it....

I am using the latest Xenomai SVN #1948.
The kernel patch is adeos-ipipe-2.6.17-i386-1.5-02.patch

Any ideas on this?

Thanks for any response

Regards

Mathias


-- 
Mathias Koehrer
mathias_koehrer@domain.hid


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Re: [Xenomai-help] Xenomai patched SMP kernel and "nosmp" kernel parameter

[Jan Kiszka]

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M. Koehrer wrote:
> Hi everybody,
> 
> I have a SMP kernel 2.6.17.7 on a Dual Core Pentium 4 running.
> SMP is enabled at the kernel configuration.
> This works fine.
> However, I want to compare UP with SMP operation, that's why
> I want to boot the system with the "nosmp" kernel parameter.
> However, booting of the PC with  nosmp does not work.
> First it starts fine, however when trying to access hdb (which is the CD ROM
> drive in my system) to get info about it, the message
> "hdb: lost interrupt"
> appears, and booting is stopped. 
> 
> Does the nosmp parameter work with a Xenomai patched kernel?
> Or what could be wrong with it....
> 
> I am using the latest Xenomai SVN #1948.
> The kernel patch is adeos-ipipe-2.6.17-i386-1.5-02.patch
> 
> Any ideas on this?

Same for maxcpus=0? I'm asking as this configures the system more
aggressively smp-less on x86 (patching spinlock alternatives for UP,
configuring LAPIC mode etc.).

Jan


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Re: Re: [Xenomai-help] Xenomai patched SMP kernel and "nosmp" kernel

[M. Koehrer]

Hi Jan,

I tried the kernel parameter maxcpus=0 on my SMP enabled, Xenomai-patched kernel (same as in mails below).
The kernel does not boot.
It stops after a couple of messages:
IOAPIC[0]: Invalid reference to IRQ 0

Regards

Mathias
> M. Koehrer wrote:
> > Hi everybody,
> > 
> > I have a SMP kernel 2.6.17.7 on a Dual Core Pentium 4 running.
> > SMP is enabled at the kernel configuration.
> > This works fine.
> > However, I want to compare UP with SMP operation, that's why
> > I want to boot the system with the "nosmp" kernel parameter.
> > However, booting of the PC with  nosmp does not work.
> > First it starts fine, however when trying to access hdb (which is the CD
> ROM
> > drive in my system) to get info about it, the message
> > "hdb: lost interrupt"
> > appears, and booting is stopped. 
> > 
> > Does the nosmp parameter work with a Xenomai patched kernel?
> > Or what could be wrong with it....
> > 
> > I am using the latest Xenomai SVN #1948.
> > The kernel patch is adeos-ipipe-2.6.17-i386-1.5-02.patch
> > 
> > Any ideas on this?
> 
> Same for maxcpus=0? I'm asking as this configures the system more
> aggressively smp-less on x86 (patching spinlock alternatives for UP,
> configuring LAPIC mode etc.).


-- 
Mathias Koehrer
mathias_koehrer@domain.hid


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Re: [Xenomai-help] Xenomai patched SMP kernel and "nosmp" kernel

[Jan Kiszka]

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M. Koehrer wrote:
> Hi Jan,
> 
> I tried the kernel parameter maxcpus=0 on my SMP enabled, Xenomai-patched kernel (same as in mails below).
> The kernel does not boot.
> It stops after a couple of messages:
> IOAPIC[0]: Invalid reference to IRQ 0

OK, a few things more to verify:

 - kernel boots fine with your scenario except CONFIG_IPIPE disabled?
 - problem persists with 2.6.19-ipipe-1.6-02?

And could you post your .config and the boot log?

Jan


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Re: Re: [Xenomai-help] Xenomai patched SMP kernel and "nosmp" kernel

[M. Koehrer]

Hi Jan,

I have used an standard vanilla kernel without any patches and this delivered the same results. 
It seems to be an issue that is not related to Xenomai or Adeos.
When I pass the kernel parameter hdb=noprobe
the kernel boots fine (however, I can not access the CD-ROM drive anymore...).
I think the reason for that could be, that my hard disk is a SATA drive and the only IDE
device is the CD ROM on hdb, I do not have a hda device.
There are many entries on that somewhere in the internet...
I'll try the same on a 2.6.19.1 kernel to see if this solves the issue.

Thanks for the hints!

Regards

Mathias


> M. Koehrer wrote:
> > Hi Jan,
> > 
> > I tried the kernel parameter maxcpus=0 on my SMP enabled, Xenomai-patched
> kernel (same as in mails below).
> > The kernel does not boot.
> > It stops after a couple of messages:
> > IOAPIC[0]: Invalid reference to IRQ 0
> 
> OK, a few things more to verify:
> 
>  - kernel boots fine with your scenario except CONFIG_IPIPE disabled?
>  - problem persists with 2.6.19-ipipe-1.6-02?
> 
> And could you post your .config and the boot log?
> 
> Jan
> 
> 

-- 
Mathias Koehrer
mathias_koehrer@domain.hid


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