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    SubjectRe: Pin-pointing the root of unusual application latencies
    Len Brown wrote:

    > 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 --

    I believe this board does not provide an IO-APIC.
    Even the LAPIC is disabled in the BIOS.
    (Why would they do that??)

    > 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 will try.

    > 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.

    The motherboard is an Adlink EBC-2000T with 3 on-board Intel 82559 NICs.
    http://www.adlinktech.com/PD/web/PD_detail.php?pid=213

    VIA Pro133T (VT82C694T + VT82C686B) chipset.
    http://www.viaarena.com/default.aspx?PageID=40&STypeID=12

    Kernel config:
    http://linux.kernel.free.fr/latency/config-2.6.20.7-rt8-adlink-latency

    dmesg:
    http://linux.kernel.free.fr/latency/dmesg.adlink

    lspci:
    http://linux.kernel.free.fr/latency/lspci.adlink

    acpidump:
    http://linux.kernel.free.fr/latency/acpidump.adlink

    Regards.
    -
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