Messages in this thread |  | | | Date | Thu, 26 Jul 2007 10:35:53 +0200 | | From | John Sigler <> | | Subject | Re: Pin-pointing the root of unusual application latencies |
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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
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