IO-APIC works on Windows and FreeBSD but not Linux ?

IO-APIC works on Windows and FreeBSD but not Linux ?

[Frédéric L. W. Meunier]

I never got IO-APIC to work with my ECS K7VTA3 5.0 (KT333) on
Linux 2.4 and 2.6. The first problem was at boot time with my
network. It wouldn't give an IRQ or something to the lan, be it
the onboard Realtek or a 3Com 3C905CX-TXNM.

ACPI with or without it was even worse, but I never needed it.
It worked fine on Windows XP Professional SP1. Some days ago I
installed FreeBSD 5.2 and now noticed it gave me IRQ18 for the
onboard lan, IRQ22 for the onboard sound, and so on, and
there's the following in /var/log/messages:

Jan 23 15:27:07 pervalidus kernel: ioapic0: Assuming intbase of 0
Jan 23 15:27:07 pervalidus kernel: ioapic0 <Version 0.3> irqs 0-23 on motherboard

I'm just surprised IO-APIC works with it but not Linux.

I reported it months ago -
http://www.uwsg.iu.edu/hypermail/linux/kernel/0306.2/1646.html

BTW, the freezes I mentioned are gone. The motherboard may be a
bit buggy, as they appear if I disable the onboard RAID, but...

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Re: IO-APIC works on Windows and FreeBSD but not Linux ?

[Frédéric L. W. Meunier]

I wrote on 2004-01-24 0:57:44:

> I never got IO-APIC to work with my ECS K7VTA3 5.0 (KT333) on
> Linux 2.4 and 2.6. The first problem was at boot time with my
> network. It wouldn't give an IRQ or something to the lan, be
> it the onboard Realtek or a 3Com 3C905CX-TXNM.

Just tested with 2.6.3, and it still happens.

> ACPI with or without it was even worse, but I never needed
> it.

Everything seems to work fine with it now.

> It worked fine on Windows XP Professional SP1. Some days ago
> I installed FreeBSD 5.2 and now noticed it gave me IRQ18 for
> the onboard lan, IRQ22 for the onboard sound, and so on, and
> there's the following in /var/log/messages:

> Jan 23 15:27:07 pervalidus kernel: ioapic0: Assuming intbase
> of 0
> Jan 23 15:27:07 pervalidus kernel: ioapic0 <Version 0.3> irqs
> 0-23 on motherboard

> I'm just surprised IO-APIC works with it but not Linux.

Still surprised, because on it everything works if I use
IO-APIC with or without ACPI.

Here are the differences in /proc/pci (- is ACPI with IO-APIC,
+ IO-APIC):

       I/O at 0xb800 [0xb81f].
   Bus  0, device  16, function  3:
     USB Controller: VIA Technologies, Inc. USB 2.0 (rev 130).
-      IRQ 21.
+      IRQ 19.
       Master Capable.  Latency=32.
       Non-prefetchable 32 bit memory at 0xdd035000 [0xdd0350ff].
   Bus  0, device  17, function  0:
     ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge (rev 0).
   Bus  0, device  17, function  1:
     IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE (rev 6).
-      IRQ 20.
+      IRQ 27.
       Master Capable.  Latency=32.
       I/O at 0xbc00 [0xbc0f].
   Bus  0, device  17, function  5:

And /proc/interrupts:

-  9:          0   IO-APIC-level  acpi
- 14:       1138    IO-APIC-edge  ide0
+ 14:        777    IO-APIC-edge  ide0
- 18:         24   IO-APIC-level  eth0
- 21:        290   IO-APIC-level  ehci_hcd, uhci_hcd, uhci_hcd, uhci_hcd
+ 21:         99   IO-APIC-level  uhci_hcd, uhci_hcd, uhci_hcd

> I reported it months ago -
> http://www.uwsg.iu.edu/hypermail/linux/kernel/0306.2/1646.html

> BTW, the freezes I mentioned are gone. The motherboard may be
> a bit buggy, as they appear if I disable the onboard RAID,
> but...

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