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Subject2.6.5-rc2-mm4 (and 3) IRQ problem
Date
I'm seeing a problem with ethernet driver (e1000) on 2.6.5-rc2-mm4, here the 
syslog excerpt:

========================
Mar 27 18:39:23 kefk kernel: e1000: eth0 NIC Link is Up 100 Mbps Full Duplex
Mar 27 18:39:23 kefk kernel: irq 18: nobody cared!
Mar 27 18:39:23 kefk kernel: Call Trace:
Mar 27 18:39:23 kefk kernel: [<c010882b>] __report_bad_irq+0x2a/0x8b
Mar 27 18:39:23 kefk kernel: [<c0108937>] note_interrupt+0x91/0xaf
Mar 27 18:39:23 kefk kernel: [<c0108c4a>] do_IRQ+0x151/0x19a
Mar 27 18:39:23 kefk kernel: [<c034b4c8>] common_interrupt+0x18/0x20
Mar 27 18:39:23 kefk kernel: [<c0104c2e>] default_idle+0x0/0x2c
Mar 27 18:39:23 kefk kernel: [<c0104c57>] default_idle+0x29/0x2c
Mar 27 18:39:23 kefk kernel: [<c0104cbb>] cpu_idle+0x2e/0x3c
Mar 27 18:39:23 kefk kernel: [<c0430a02>] start_kernel+0x196/0x1c5
Mar 27 18:39:23 kefk kernel: [<c0430436>] unknown_bootoption+0x0/0x126
Mar 27 18:39:23 kefk kernel:
Mar 27 18:39:23 kefk kernel: handlers:
Mar 27 18:39:23 kefk kernel: [<c02a7b0b>] (ata_interrupt+0x0/0x173)
Mar 27 18:39:23 kefk kernel: [<c02d2f9c>] (usb_hcd_irq+0x0/0x67)
Mar 27 18:39:23 kefk kernel: Disabling IRQ #18
===========================

I've seen the same problem on -mm3, but that version has other problems that
prevents me to do more tests.

A similar issue was present in earlier kernel when I've tried to use SATA
driver compiled as modules, same behaviour, solved by compiling SATA driver
as built-in, not as module. (I've both normal ATA and SATA controllers active
on my mb)

under 2.6.5-rc2-mm1, this is the output of cat /proc/interrupts; as you can
see there is also a nvidia module, but the problem arises event without that
module. irq 18 is shared between eth0,libata and uhci_hcd.

[root@kefk root]# cat /proc/interrupts
CPU0 CPU1
0: 1002506 0 IO-APIC-edge timer
1: 4722 0 IO-APIC-edge i8042
2: 0 0 XT-PIC cascade
9: 0 0 IO-APIC-level acpi
12: 8826 0 IO-APIC-edge i8042
14: 11920 0 IO-APIC-edge ide0
15: 23 0 IO-APIC-edge ide1
16: 278123 0 IO-APIC-level uhci_hcd, uhci_hcd, nvidia
17: 2337 0 IO-APIC-level Intel ICH5
18: 56240 0 IO-APIC-level libata, uhci_hcd, eth0
19: 55 0 IO-APIC-level uhci_hcd
22: 279 0 IO-APIC-level aic7xxx
23: 0 0 IO-APIC-level ehci_hcd
NMI: 0 0
LOC: 1002427 1002439
ERR: 0
MIS: 0

The MB is a ABIT IC7-G (i875p) ICH5, the kernel is compiled with SMP/SMT
support active.

Please let me know if more details are needed.

A small question, not related to the above issue:
reverting 4k-stacks-always-on.patch can lead to problems or it's safe? I've to
run nvidia binary driver so I've to use 8k instead of 4k; it would be better
(for my standpoint) to have the possibility to disable 4k from config, but to
do so I've to revert this patch. Apart from losing time to do a patch -R :),
using 8k can be a problem?

Many thanks for any answer.

--
Fabio Coatti http://www.ferrara.linux.it/members/cova
Ferrara Linux Users Group http://ferrara.linux.it
GnuPG fp:9765 A5B6 6843 17BC A646 BE8C FA56 373A 5374 C703
Old SysOps never die... they simply forget their password.
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