lkml.org 
[lkml]   [2007]   [Feb]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: smp and irq conflict
    On Thu, 1 Feb 2007 18:46:00 +0100 "Lapo TIN" <lapolapolapo@tin.it> wrote:

    > Dear all,
    > I have a problem with IRQs.
    >
    > My pc has a CPU PentiumD945 (dual core) and a 2.6.19smp kernel.
    > I have two video acquisition board (four bt8t8 each) in the only two pci
    > slots of my motherboard. Thus I have a total of 8 bttv modules that are
    > working together, and the /proc/interrupts is as follows:
    > # cat /proc/interrupts
    > CPU0 CPU1
    > 0: 13575 0 IO-APIC-edge timer
    > 1: 2 0 IO-APIC-edge i8042
    > 4: 11 0 IO-APIC-edge serial
    > 8: 1 0 IO-APIC-edge rtc
    > 9: 0 0 IO-APIC-fasteoi acpi
    > 12: 4 0 IO-APIC-edge i8042
    > 14: 22286 0 IO-APIC-edge ide0
    > 17: 7073 2097 IO-APIC-fasteoi uhci_hcd:usb5, eth0
    > 18: 2525 0 IO-APIC-fasteoi bttv0, bttv7
    > 19: 2829 0 IO-APIC-fasteoi bttv1, bttv4
    > 20: 2526 0 IO-APIC-fasteoi bttv2, bttv5
    > 21: 2226 0 IO-APIC-fasteoi bttv3, bttv6
    > 22: 2 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb4
    > 23: 86 0 IO-APIC-fasteoi uhci_hcd:usb2
    > 24: 0 0 IO-APIC-fasteoi uhci_hcd:usb3
    > NMI: 0 0
    > LOC: 13484 13502
    > ERR: 0
    > MIS: 0
    > You can see that IRQ18 is shared between bttv0 and bttv7, IRQ19 between
    > bttv1 and bttv4 and so on.
    >
    > Sometimes it crashes. It seems a matter of conflict in IRQ.
    > With only one video board everything is ok, but with two, they shared irq
    > and something goes wrong...
    > How can I tell to the kernel to not to share the IRQ for these boards ?
    > I think (I don't know if I'm right) that this could be the problem.
    >
    > I even tried with another motherboard, and doing cat /proc/interrupts the
    > situation was the same, except for 'eth0' that was together with bttv0 and
    > bttv7... so it was even worst ! it crashes after few minutes.
    >
    > I tried to read IO-APIC.txt in Documentation/i386/ folder, but I didn't
    > understand how to avoid the coupling of IRQ.
    > Thanks

    Should be OK. Can you provide us with any kernel output from these crashes?

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-02-02 05:35    [W:4.591 / U:0.008 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site