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Date:      Sat, 10 Jan 2009 11:15:10 +0800
From:      Zhang Weiwu <>
Subject:   Re: newbie: does irq setting in device.hints work?
Message-ID:  <>
In-Reply-To: <>
References:  <> <>

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Lowell Gilbert wrote:
> Zhang Weiwu <> writes:
>> That's strange, I didn't find manual where it say it work in some
>> condition or for some device only.
> "Consult individual device drivers' manual pages for available keywords
> and their possible values."
Thanks. I shouldn't have overlooked this.
>> Is there a way to assign uhci to use an irq differently? seems it is the
>> cause of an interrupt storm problem I am having.
> I'm not really sure if uhci is set up to do that.  You definitely want
> uhci on its own interrupt if you can, not because it necessarily
> generates a lot of them, but because it can spend a lot of time handling
> each one...
> Have you checked what happens if you disable your APIC?
You mean ACPI? When the PC boots, I got a menu looks alike this one:
except my 2nd choice was "with ACPI enabled" instead of ACPI disabled. I
chose 2, result was the same (irq at 11)

I also tried to move other devices occupying irq 11 away (cbb0 and ed1)
by setting so in device.hints and both didn't work.

[zhangweiwu@quasimodo ~]$ vmstat -i
interrupt                          total       rate
irq0: clk                          92204        980
irq1: atkbd0                         188          2
irq6: fdc0                            11          0
irq8: rtc                          11802        125
irq11: cbb0 ed1+                      38          0
irq14: ata0                         1699         18
Total                             105942       1127
[zhangweiwu@quasimodo ~]$ dmesg | grep 'irq 11'
uhci0: <Intel 82371AB/EB (PIIX4) USB controller> port 0x9000-0x901f irq 11 at device 6.2 on pci0
ed1: <IBM Corp. Ethernet> at port 0x100-0x11f iomem 0x88000000-0x88003fff irq 11 function 0 config 1 on pccard0

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