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Kisil
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Joined: 23 Dec 2005
Posts: 44
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 Posted: Sun Jul 30, 2006 9:39 pm Post subject: Interrupt conflicts - [SOLVED] |
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For some reason, all my important devices are being assigned irq 11. I dual boot windows, and I don't have the same problem there, so I'd rather not twiddle with bios - I ought to be able to configure linux to spread them better. This thread seems to describe my issue, but I'm having trouble translating that into what I should change. Can anyone give me any insight?
Here's the info I think is relevant; I'm happy to provide more if needed.
| Code: | $ cat /proc/interrupts
CPU0
0: 275211 XT-PIC timer
1: 2272 XT-PIC i8042
2: 0 XT-PIC cascade
7: 0 XT-PIC parport0
8: 0 XT-PIC rtc
9: 0 XT-PIC acpi
11: 107261 XT-PIC ehci_hcd:usb1, ohci_hcd:usb2, ohci_hcd:usb3, EM
U10K1, nvidia
12: 71797 XT-PIC i8042
14: 63034 XT-PIC ide0
15: 42 XT-PIC ide1
NMI: 0
ERR: 0 |
| Code: | $ cat /usr/src/linux/.config | grep -i apic
CONFIG_X86_GOOD_APIC=y
# CONFIG_X86_UP_APIC is not set |
| Code: | $ cat /usr/src/linux/.config | grep -i apm
# Power management options (ACPI, APM)
# APM (Advanced Power Management) BIOS Support
# CONFIG_APM is not set |
| Code: | $ cat /usr/src/linux/.config | grep -i acpi
# Power management options (ACPI, APM)
# ACPI (Advanced Configuration and Power Interface) Support
CONFIG_ACPI=y
CONFIG_ACPI_SLEEP=y
CONFIG_ACPI_SLEEP_PROC_FS=y
# CONFIG_ACPI_SLEEP_PROC_SLEEP is not set
CONFIG_ACPI_AC=y
CONFIG_ACPI_BATTERY=y
CONFIG_ACPI_BUTTON=y
CONFIG_ACPI_VIDEO=y
# CONFIG_ACPI_HOTKEY is not set
CONFIG_ACPI_FAN=y
CONFIG_ACPI_PROCESSOR=y
CONFIG_ACPI_THERMAL=y
# CONFIG_ACPI_ASUS is not set
# CONFIG_ACPI_IBM is not set
# CONFIG_ACPI_TOSHIBA is not set
CONFIG_ACPI_BLACKLIST_YEAR=0
# CONFIG_ACPI_DEBUG is not set
CONFIG_ACPI_EC=y
CONFIG_ACPI_POWER=y
CONFIG_ACPI_SYSTEM=y
# CONFIG_ACPI_CONTAINER is not set
CONFIG_PNPACPI=y
# CONFIG_SERIAL_8250_ACPI is not set |
Thanks for looking 
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Last edited by Kisil on Tue Aug 01, 2006 12:04 am; edited 1 time in total |
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Philantrop
Retired Dev
Joined: 21 Dec 2004
Posts: 1130
Location: Germany
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| Posted: Mon Jul 31, 2006 6:11 am Post subject: |
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If you have a somewhat recent system, try setting these:
| Code: | CONFIG_X86_GOOD_APIC=y
CONFIG_X86_UP_APIC=y
CONFIG_X86_UP_IOAPIC=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
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Especially helpful should be IO_APIC. An example from my system:
| Code: | CPU0
0: 65608625 IO-APIC-edge timer
1: 270533 IO-APIC-edge i8042
8: 2 IO-APIC-edge rtc
9: 0 IO-APIC-level acpi
12: 3733996 IO-APIC-edge i8042
14: 3059977 IO-APIC-edge ide0
15: 3124924 IO-APIC-edge ide1
169: 4595169 IO-APIC-level eth0
177: 46183748 IO-APIC-level aic7xxx, ohci1394, nvidia
185: 31 IO-APIC-level ehci_hcd:usb1, uhci_hcd:usb2, uhci_hcd:usb3, uhci_hcd:usb4
193: 9 IO-APIC-level Bt87x audio, bttv0
201: 140818 IO-APIC-level VIA8233
NMI: 0
LOC: 65610613
ERR: 0
MIS: 0
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Yes, the high IRQs are routed over IRQ 9 but I've never had any issues like that.
One question remains, though: What actual problems is the behaviour on your system causing you?
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Kisil
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Joined: 23 Dec 2005
Posts: 44
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| Posted: Mon Jul 31, 2006 10:40 am Post subject: |
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The actual problem is audio jittering with my usb audio card - when my usb network card is working, it is even worse, but even normally it is almost unusable. I had the same problem in Windows until I sorted out the IRQ issues there, at which point everything worked fine.
I don't see most of those APIC options in my menuconfig - just GOOD_APIC and UP_APIC - are they hiding somewhere I haven't checked? I'll try setting UP_APIC tonight after work, see what that does. Have no time now.
My system isn't that recent - Biostar Nforce2-based MB, Athlon XP 2600, etc.
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Philantrop
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Joined: 21 Dec 2004
Posts: 1130
Location: Germany
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| Posted: Mon Jul 31, 2006 12:59 pm Post subject: |
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Kisil, I'd still call that system recent. :-)
Which kernel sources and version are you trying to use?
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54834
Location: 56N 3W
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| Posted: Mon Jul 31, 2006 1:08 pm Post subject: |
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Kisil,
Some of those options are permanently hidden and one is a sub option.
Turn on | Code: | | Local APIC support on uniprocessors |
and its sub option | Code: | | IO-APIC support on uniprocessors |
You get the rest automatically. This is one of the places that a single option controls several .config file flags.
You may also need to add lapic to your kernel command line.
The other thing you can try is to increase the audio buffer size setting in your sound applications.
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NeddySeagoon
Computer users fall into two groups:-
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Kisil
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Joined: 23 Dec 2005
Posts: 44
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| Posted: Mon Jul 31, 2006 11:26 pm Post subject: |
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I'm using gentoo sources, 2.6.16-r9. I'm recompiling with those two options enabled as we speak; I have to go, but I'll post the results when I reboot.
What do you mean by "add lapic to your kernel command line" ? Use flag, environmental variable? I'm pretty green with this.
I played a lot with the buffer sizes in jack, but I couldn't get any substantial performance increase, even at latencies that are way slower than I can accept for what I want to do.
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NeddySeagoon
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| Posted: Mon Jul 31, 2006 11:37 pm Post subject: |
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Kisil,
In /boot/grub/grub.conf like this | Code: | title=Kernel 2.6.17-gentoo-r4 (hd0)
root (hd0,0)
kernel (hd0,0)/2.6.17-gentoo-r4 root=/dev/md1 lapic |
you may need to add lapic as a kernel option
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
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Kisil
n00b
Joined: 23 Dec 2005
Posts: 44
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| Posted: Mon Jul 31, 2006 11:38 pm Post subject: |
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Rebooted. | Code: | $ cat /proc/interrupts
CPU0
0: 34391 IO-APIC-edge timer
1: 115 IO-APIC-edge i8042
7: 0 IO-APIC-edge parport0
8: 0 IO-APIC-edge rtc
9: 0 IO-APIC-level acpi
12: 5315 IO-APIC-edge i8042
14: 7228 IO-APIC-edge ide0
15: 42 IO-APIC-edge ide1
16: 0 IO-APIC-level ohci_hcd:usb3
17: 3437 IO-APIC-level ehci_hcd:usb1
18: 14 IO-APIC-level ohci_hcd:usb2
19: 6635 IO-APIC-level nvidia
20: 0 IO-APIC-level EMU10K1
NMI: 0
LOC: 34109
ERR: 0
MIS: 0 |
That looks good to me, although it's odd that the IRQs are above 16 - do you know why that is?
Also, what would the lapic switch do?
I'm going to test my audio gear now.
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NeddySeagoon
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| Posted: Mon Jul 31, 2006 11:46 pm Post subject: |
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Kisil,
The IO-APIC provides up to 255 IRQs.
It stands for Input/Output-Advanced Peripheral Interrupt Controller. In its defualt state, it mimics the two XT-PIC fitted to AT PCs to give the well known 15 IRQs.
When its enabled into its IO-APIC state, you get a lot more IRQs, so things don't share, with the increased latencey that causes.
The lapic on the kernel line, tells the kernel to use it, even if its been disabled by the BIOS.
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NeddySeagoon
Computer users fall into two groups:-
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Kisil
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Joined: 23 Dec 2005
Posts: 44
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| Posted: Tue Aug 01, 2006 12:03 am Post subject: |
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Wyrd.
My problems are gone, at least as far as interrupts (alsa still doesn't seem to like my usx2y card, but Jack does at least.)
Thanks for all the help and info; I know this would have taken me days of twiddling to figure out. Much obliged.
Changing status to solved.
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