Do you boot with noapic?
On Wed, 30 Sep 2009, Justin Piszcz wrote:
Hi Hugo,
I use a DG965 board currently with built-in video and a 3ware card in the x16
slot:
$ cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 3241 0 0 0 IO-APIC-edge timer
1: 2 0 0 0 IO-APIC-edge i8042
8: 1 0 0 0 IO-APIC-edge rtc0
9: 0 0 0 0 IO-APIC-fasteoi acpi
12: 3 0 0 0 IO-APIC-edge i8042
16: 4383796 12792529 5711773 5079069 IO-APIC-fasteoi 3w-9xxx,
uhci_hcd:usb3
18: 57977 14740 0 0 IO-APIC-fasteoi
ehci_hcd:usb1, uhci_hcd:usb7
19: 35308 35028 0 0 IO-APIC-fasteoi
uhci_hcd:usb6
21: 57951 77630159 3692228 99277364 IO-APIC-fasteoi
uhci_hcd:usb4, eth1
22: 552076 6937190 17079516 15588018 IO-APIC-fasteoi HDA
Intel, eth2
23: 3448429 13678957 0 0 IO-APIC-fasteoi
ehci_hcd:usb2, uhci_hcd:usb5
30: 455701 209453 0 0 PCI-MSI-edge
i...@pci:0000:00:02.0
31: 861003 3495076 9393 3194492 PCI-MSI-edge ahci
32: 2621566 20858202 5466083 85380656 PCI-MSI-edge eth0
If you play around with the kernel options, I believe there is an option to
move things around so it goes onto its own IRQ (the graphics card). I will
see if I can remember what it was, I had the same issue, i915 was on the same
IRQ as the 3ware card I believe. I do not recall off-hand which option it
was.
Will take a look and report back if I find anything.
Justin.
On Wed, 30 Sep 2009, Jacques, Hugo wrote:
Hi,
I have an Intel 945G-based system on which I installed a custom board
(qhal_host below) into the PCIe x16 slot.
I am running Linux 2.6.29.6, Xorg 1.6.0 and xf86-video-intel 2.7.0.
Is there a way to have the Integrated Graphics Controller
(i...@pci:0000:00:02.0 below) being assigned to an IRQ different than 16?
I am asking this because I want to debug an interrupt issue. At some point
I get ~100000 interrupts a second on IRQ16 despite neither the qhal_host or
the Intel GPU devices report the interrupt is theirs (through respective
IIR registers).
Anybody heard of 945G issues when both the GPU and a card in the PCIe x16
slot are generating interrupts as the same time?
Thanks in advance.
cat /proc/interrupts
CPU0 CPU1
0: 71 0 IO-APIC-edge timer
1: 2 0 IO-APIC-edge i8042
2: 0 0 XT-PIC-XT cascade
4: 10 0 IO-APIC-edge
9: 0 0 XT-PIC-XT acpi
14: 7882 0 IO-APIC-edge ide0
16: 8586 0 IO-APIC-fasteoi
qhal_host,i...@pci:0000:00:02.0
28: 5872 0 PCI-MSI-edge eth0
30: 0 0 PCI-MSI-edge ahci
NMI: 0 0 Non-maskable interrupts
LOC: 2170197 2053944 Local timer interrupts
RES: 754 957 Rescheduling interrupts
CAL: 35 22 Function call interrupts
TLB: 409 421 TLB shootdowns
TRM: 0 0 Thermal event interrupts
SPU: 0 0 Spurious interrupts
ERR: 0
MIS: 0
Hugo Jacques, ing.
Video Tech Leader
Video Intelligence Solutions
Verint Systems Inc.
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