Interrupt storm detected on "irq7: lpt0"

Willem Jan Withagen wjw at
Fri Sep 10 02:25:59 PDT 2004

I think I tried that one, but it did not work. I still have that flag 
Now that is a long time ago, and this could be done without rebooting 
the server.

ppc0: using extended I/O port range
ppc0 port 0x778-0x77b,0x378-0x37b irq 7 drq 3 on acpi0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/9 bytes threshold
ppbus0: <Parallel port bus> on ppc0
ppbus0: IEEE1284 device found /NIBBLE/ECP/NIBBLE_ID/ECP_ID/Extensibility 
Probing for PnP devices on ppbus0:
ppbus0: <Hewlett-Packard HP LaserJet 2100 Series> 
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port

I'll give it a shot for the next reboot.

Major difference I see is that you've got the device on isa0 whereas 
mine is on acpi0


Ian FREISLICH wrote:

>Willem Jan Withagen wrote:
>>I've uped  the limit for what the max of interrupts could be....
>>In  /etc/sysctl.conf
>>Bit I've seen my lpt intr go as high as 60.000
>Why not force ECP?
>/boot/device.hints: hint.ppc.0.flags="0x8"
>ppc0: <Parallel port> at port 0x378-0x37f irq 7 flags 0x8 on isa0
>ppc0: SMC-like chipset (ECP-only) in ECP mode
>ppc0: FIFO with 16/16/16 bytes threshold
>ppbus0: <Parallel port bus> on ppc0
>lpt0: <Printer> on ppbus0
>lpt0: Interrupt-driven port
>Ian Freislich

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