/proc/interrupts has non-printable chars in kernel 3.3.1

/proc/interrupts has non-printable chars in kernel 3.3.1

[Toralf Förster]

[-- Attachment #1: Type: Text/Plain, Size: 354 bytes --]

The interrrupt 47 shows (with powertop) a curious "Description" :

[@^EM-W] <interrupt>

under a stable Gentoo Linux at a Thinkpad T400  - the BIOS is the latest 
available. FWIW I attached the output of the command  $>cat /proc/interrupts

-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: i --]
[-- Type: text/plain; charset="UTF-8"; name="i", Size: 1978 bytes --]

           CPU0       CPU1       
  0:      37165       8908   IO-APIC-edge      timer
  1:        875        862   IO-APIC-edge      i8042
  9:      16865       1071   IO-APIC-fasteoi   acpi
 12:        283        214   IO-APIC-edge      i8042
 16:          0          0   IO-APIC-fasteoi   uhci_hcd:usb6
 17:          0          0   IO-APIC-fasteoi   uhci_hcd:usb7
 18:          0          0   IO-APIC-fasteoi   uhci_hcd:usb8
 19:          0          0   IO-APIC-fasteoi   ehci_hcd:usb2
 20:      14517      14706   IO-APIC-fasteoi   uhci_hcd:usb3
 21:        142         36   IO-APIC-fasteoi   uhci_hcd:usb4
 22:          0          0   IO-APIC-fasteoi   uhci_hcd:usb5
 23:     403168          2   IO-APIC-fasteoi   ehci_hcd:usb1
 40:          0          0   PCI-MSI-edge      PCIe PME
 41:          0          0   PCI-MSI-edge      PCIe PME
 42:          0          0   PCI-MSI-edge      PCIe PME
 43:          0          0   PCI-MSI-edge      PCIe PME
 44:    1033332      61889   PCI-MSI-edge      ahci
 45:      65326      84792   PCI-MSI-edge      eth0
 46:      36422      36519   PCI-MSI-edge      iwlwifi
 47:     289270     468524   PCI-MSI-edge      @\x05Ç×
 48:        297        413   PCI-MSI-edge      snd_hda_intel
NMI:          0          0   Non-maskable interrupts
LOC:   28761071   28149530   Local timer interrupts
SPU:          0          0   Spurious interrupts
PMI:          0          0   Performance monitoring interrupts
IWI:          6          6   IRQ work interrupts
RTR:          0          0   APIC ICR read retries
RES:     259912     403208   Rescheduling interrupts
CAL:        538        528   Function call interrupts
TLB:     166554     187899   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
MCE:          0          0   Machine check exceptions
MCP:         72         72   Machine check polls
ERR:          0
MIS:          0

Re: /proc/interrupts has non-printable chars in kernel 3.3.1

[Jiri Slaby]

On 04/10/2012 07:34 PM, Toralf Förster wrote:
> The interrrupt 47 shows (with powertop) a curious "Description" :
> 
> [@^EM-W] <interrupt>
> 
> under a stable Gentoo Linux at a Thinkpad T400  - the BIOS is the latest 
> available. FWIW I attached the output of the command  $>cat /proc/interrupts
...
>  47:     289270     468524   PCI-MSI-edge      @\x05��

It would be great if you could dig out of dmesg, who is bound to the
interrupt.

regards,
-- 
js
suse labs

Re: /proc/interrupts has non-printable chars in kernel 3.3.1

[Toralf Förster]

Jiri Slaby wrote at 20:19:57
> On 04/10/2012 07:34 PM, Toralf Förster wrote:
> > The interrrupt 47 shows (with powertop) a curious "Description" :
> > 
> > [@^EM-W] <interrupt>
> > 
> > under a stable Gentoo Linux at a Thinkpad T400  - the BIOS is the latest
> > available. FWIW I attached the output of the command  $>cat
> > /proc/interrupts
> 
> ...
> 
> >  47:     289270     468524   PCI-MSI-edge      @\x05��
> 
> It would be great if you could dig out of dmesg, who is bound to the
> interrupt.
> 
> regards,
n22 /etc # dmesg | grep 'irq 47'
snd_hda_intel 0000:00:1b.0: irq 47 for MSI/MSI-X


-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

Re: /proc/interrupts has non-printable chars in kernel 3.3.1

[Clemens Ladisch]

Toralf Förster wrote:
> Jiri Slaby wrote at 20:19:57
>> On 04/10/2012 07:34 PM, Toralf Förster wrote:
>>>  47:     289270     468524   PCI-MSI-edge      @\x05��
>>>  48:        297        413   PCI-MSI-edge      snd_hda_intel
>>
>> It would be great if you could dig out of dmesg, who is bound to the
>> interrupt.
>
> snd_hda_intel 0000:00:1b.0: irq 47 for MSI/MSI-X

Two HDA controllers are typically for the on-board codec and for the
GPU's HDMI outputs.

snd-hda-intel uses KBUILD_MODNAME for this string, so in theory, it
should not be possible for garbage to appear if the same string for
irq 48 is OK.

Which device is 0:1b.0 (see lspci)?  And does the high number of
interrupts indicate that you did play sounds through it?


Regards,
Clemens