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    SubjectRe: Pin-pointing the root of unusual application latencies
    Date
    On Wednesday 25 July 2007 10:05, John Sigler wrote:

    > # cat /proc/interrupts
    > CPU0
    > 0: 37 XT-PIC-XT timer
    > 1: 2 XT-PIC-XT i8042
    > 2: 0 XT-PIC-XT cascade
    > 7: 0 XT-PIC-XT acpi
    > 10: 175 XT-PIC-XT eth2, Dta1xx
    > 11: 1129 XT-PIC-XT eth0
    > 12: 4 XT-PIC-XT eth1
    > 14: 21482 XT-PIC-XT ide0
    > NMI: 0
    > LOC: 161632
    > ERR: 0
    > MIS: 0
    >
    > IRQ 10 is shared between a NIC and an I/O board.
    >
    > For eth2, the kernel said:
    > ACPI: PCI Interrupt 0000:00:0a.0[A] -> Link [LNKC]
    > -> GSI 10 (level, low) -> IRQ 10
    >
    > For Dta1xx, the kernel said:
    > ACPI: PCI Interrupt 0000:02:0e.0[A] -> Link [LNKC]
    > -> GSI 10 (level, low) -> IRQ 10
    >
    > Is it possible to avoid the two boards sharing IRQ 10?

    Maybe. In this configuration, INTA of the two devices
    is physically connected to the same wire on the device-side
    of the interrupt re-mapper -- so you'd have to change the configuration.
    If you have an IOAPIC and can enable it, that will not hurt --
    though unless something else changes, these devices are still
    tied together on the device-side of the mapper.
    So if you can physically move one of the devices to another slot
    that is your best bet.

    I'd need a bunch of info from your system to tell you what
    you can do ahead of time, including full dmesg, lspci -vv
    and acpidump.

    -Len
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