Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt responses)

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I have the same problem on my Lenovo T500. I think the graphics card is
involved.

This laptop has "hybrid graphics" - one Intel GMA 4500MHD and one ATI
Mobility Radeon HD 3650. When I boot with the Intel card, I get "irq 16:
nobody cared" during boot, not when I boot with the ATI card.

And /proc/interrupts are surely different with the two cards. Look at
the irq 16 line:

$ cat intel-interrupts.txt
           CPU0       CPU1
  0:      23658      22859   IO-APIC-edge      timer
  1:        168        177   IO-APIC-edge      i8042
  8:          1          0   IO-APIC-edge      rtc0
  9:        329        347   IO-APIC-fasteoi   acpi
 12:       3065       3166   IO-APIC-edge      i8042
 16:      49732      50269   IO-APIC-fasteoi   yenta, uhci_hcd:usb6
 17:          1          0   IO-APIC-fasteoi   firewire_ohci, uhci_hcd:usb7
 18:          0          0   IO-APIC-fasteoi   mmc0, uhci_hcd:usb8
 19:        216        204   IO-APIC-fasteoi   ehci_hcd:usb2
 20:          0          0   IO-APIC-fasteoi   uhci_hcd:usb3
 21:        114        103   IO-APIC-fasteoi   uhci_hcd:usb4
 22:          0          0   IO-APIC-fasteoi   uhci_hcd:usb5
 23:          9          9   IO-APIC-fasteoi   i801_smbus, ehci_hcd:usb1
 40:          0          0  DMAR_MSI-edge      dmar2
 41:          0          0  DMAR_MSI-edge      dmar0
 42:          0          0  DMAR_MSI-edge      dmar3
 43:          0          0   PCI-MSI-edge      PCIe PME
 44:          0          0   PCI-MSI-edge      PCIe PME
 45:          0          0   PCI-MSI-edge      PCIe PME
 46:          0          0   PCI-MSI-edge      PCIe PME
 47:      10023      10173   PCI-MSI-edge      ahci
 48:         10          8   PCI-MSI-edge      mei
 49:         22         30   PCI-MSI-edge      eth0
 50:         66         71   PCI-MSI-edge      i915
 51:       2508       2348   PCI-MSI-edge      iwlwifi
 52:        168        169   PCI-MSI-edge      snd_hda_intel
NMI:         17         17   Non-maskable interrupts
LOC:      27988      25243   Local timer interrupts
SPU:          0          0   Spurious interrupts
PMI:         17         17   Performance monitoring interrupts
IWI:          0          0   IRQ work interrupts
RTR:          0          0   APIC ICR read retries
RES:       4584       2746   Rescheduling interrupts
CAL:       6178       7492   Function call interrupts
TLB:        702        651   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
MCE:          0          0   Machine check exceptions
MCP:          1          1   Machine check polls
ERR:          0
MIS:          0

$ cat ati-interrupts.txt
           CPU0       CPU1
  0:      15488      15268   IO-APIC-edge      timer
  1:        182        189   IO-APIC-edge      i8042
  8:          1          0   IO-APIC-edge      rtc0
  9:        328        339   IO-APIC-fasteoi   acpi
 12:       2071       1997   IO-APIC-edge      i8042
 16:         55         47   IO-APIC-fasteoi   yenta, uhci_hcd:usb4
 17:          1          1   IO-APIC-fasteoi   firewire_ohci, uhci_hcd:usb5
 18:          0          0   IO-APIC-fasteoi   uhci_hcd:usb6, mmc0
 19:        219        202   IO-APIC-fasteoi   ehci_hcd:usb8
 20:          0          0   IO-APIC-fasteoi   uhci_hcd:usb1
 21:        112        104   IO-APIC-fasteoi   uhci_hcd:usb2
 22:          0          0   IO-APIC-fasteoi   uhci_hcd:usb3
 23:         10          8   IO-APIC-fasteoi   i801_smbus, ehci_hcd:usb7
 40:          0          0  DMAR_MSI-edge      dmar1
 41:          0          0  DMAR_MSI-edge      dmar0
 42:          0          0  DMAR_MSI-edge      dmar2
 43:          0          0   PCI-MSI-edge      PCIe PME
 44:          0          0   PCI-MSI-edge      PCIe PME
 45:          0          0   PCI-MSI-edge      PCIe PME
 46:          0          0   PCI-MSI-edge      PCIe PME
 47:          0          0   PCI-MSI-edge      PCIe PME
 48:       9733       9932   PCI-MSI-edge      ahci
 49:          9          9   PCI-MSI-edge      mei
 50:       2308       2196   PCI-MSI-edge      iwlwifi
 51:         15         35   PCI-MSI-edge      eth0
 52:        818        815   PCI-MSI-edge      radeon
 53:        167        167   PCI-MSI-edge      snd_hda_intel
NMI:         17         16   Non-maskable interrupts
LOC:      18139      34223   Local timer interrupts
SPU:          0          0   Spurious interrupts
PMI:         17         16   Performance monitoring interrupts
IWI:          0          0   IRQ work interrupts
RTR:          0          0   APIC ICR read retries
RES:       3788       3563   Rescheduling interrupts
CAL:       6303       5894   Function call interrupts
TLB:        711        711   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
MCE:          0          0   Machine check exceptions
MCP:          1          1   Machine check polls
ERR:          0
MIS:          0
-- 
Hilsen Harald
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