appearance of /proc/interrupts ?

appearance of /proc/interrupts ?

[Steven Scholz]

Hi,

with Linux 2.6.17-rt3 /proc/interrupts looks as described on

	http://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO

           CPU0
  0:      11188  XT-PIC         [........N/  0]-level    pit
  1:          8  XT-PIC         [........./  0]-level    i8042
  2:          0  XT-PIC         [........N/  0]-level    cascade
  4:        131  XT-PIC         [........./ 10]-level    serial
 11:         10  XT-PIC         [........./  0]-level    eth0
 14:       4087  XT-PIC         [........./  0]-level    ide0

But when using a Linux 2.6.19.1-rt15 it looks like

           CPU0
  0:      15499   IO-APIC-edge      timer
  1:          8   IO-APIC-edge      i8042
  4:        161   IO-APIC-edge      serial
  9:          0   IO-APIC-fasteoi   acpi
 12:          3   IO-APIC-edge      i8042
 14:       4082   IO-APIC-edge      ide0
 16:         93   IO-APIC-fasteoi   eth0

which is pretty much the same as a vanilla 2.6.19.

What does it mean? Is RT PREEMPT not working correctly?

Thanks,

Steven

Re: appearance of /proc/interrupts ?

[Ingo Molnar]

* Steven Scholz <steven.scholz@imc-berlin.de> wrote:

> with Linux 2.6.17-rt3 /proc/interrupts looks as described on
> 
> 	http://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO
> 
>            CPU0
>   0:      11188  XT-PIC         [........N/  0]-level    pit
>   1:          8  XT-PIC         [........./  0]-level    i8042
>   2:          0  XT-PIC         [........N/  0]-level    cascade
>   4:        131  XT-PIC         [........./ 10]-level    serial
>  11:         10  XT-PIC         [........./  0]-level    eth0
>  14:       4087  XT-PIC         [........./  0]-level    ide0
> 
> But when using a Linux 2.6.19.1-rt15 it looks like
> 
>            CPU0
>   0:      15499   IO-APIC-edge      timer
>   1:          8   IO-APIC-edge      i8042
>   4:        161   IO-APIC-edge      serial
>   9:          0   IO-APIC-fasteoi   acpi
>  12:          3   IO-APIC-edge      i8042
>  14:       4082   IO-APIC-edge      ide0
>  16:         93   IO-APIC-fasteoi   eth0
> 
> which is pretty much the same as a vanilla 2.6.19.
> 
> What does it mean? Is RT PREEMPT not working correctly?

i restored it to be as compatible with upstream as possible. You have a 
PREEMPT_RT kernel if you have this message in the dmesg:

  Real-Time Preemption Support (C) 2004-2006 Ingo Molnar

	Ingo

Re: appearance of /proc/interrupts ?

[Steven Scholz]

Ingo,

>> What does it mean? Is RT PREEMPT not working correctly?
> 
> i restored it to be as compatible with upstream as possible. You have a 
> PREEMPT_RT kernel if you have this message in the dmesg:
> 
>   Real-Time Preemption Support (C) 2004-2006 Ingo Molnar
> 

Ah. I see. Thanks! Maybe someone could update the wiki then! ;-)

Thanks a million,

Steven

Re: appearance of /proc/interrupts ?

[Robert Schwebel]

On Thu, Jan 11, 2007 at 12:04:17PM +0100, Steven Scholz wrote:
> Ah. I see. Thanks! Maybe someone could update the wiki then! ;-)

Yep; Fu, could you please update the HOWTO?

Btw, if nobody has a good idea how to convert from docbook to the wiki
format, we'll probably put the HOWTO to some place where the HTML
version can be generated from the original docbook automatically. The
way it is done now (with lots of hand-fiddeling) isn't really going to
work.

Robert 
-- 
 Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
 Pengutronix - Linux Solutions for Science and Industry
   Handelsregister:  Amtsgericht Hildesheim, HRA 2686
     Hannoversche Str. 2, 31134 Hildesheim, Germany
   Phone: +49-5121-206917-0 |  Fax: +49-5121-206917-9

Re: appearance of /proc/interrupts ?

[Steven Scholz]

Robert Schwebel wrote:
> On Thu, Jan 11, 2007 at 12:04:17PM +0100, Steven Scholz wrote:
>> Ah. I see. Thanks! Maybe someone could update the wiki then! ;-)
> 
> Yep; Fu, could you please update the HOWTO?

And is it possible that the "command line" mentioned for the "Interval 500
micro seconds" test cases is wrong? "-i 10000" is 10ms, right?

--
Steven

Re: appearance of /proc/interrupts ?

[Luotao Fu]

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Hi,
On Thu, Jan 11, 2007 at 12:50:25PM +0100, Robert Schwebel wrote:
> On Thu, Jan 11, 2007 at 12:04:17PM +0100, Steven Scholz wrote:
> > Ah. I see. Thanks! Maybe someone could update the wiki then! ;-)
> 
> Yep; Fu, could you please update the HOWTO?
> 
The change is obviously made since 2.6.19-rt4, I just added the 
info to the wiki.

cheers
Fu
-- 
     Dipl.-Ing. Luotao Fu | http://www.pengutronix.de
  Pengutronix - Linux Solutions for Science and Industry
    Handelsregister: Amtsgericht Hildesheim, HRA 2686
      Hannoversche Str. 2, 31134 Hildesheim, Germany
    Phone: +49-5121-206917-0 |  Fax: +49-5121-206917-9


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