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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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