serial8250: too much work for irq17
Steven Stern
subscribed-lists at sterndata.com
Wed Jul 4 17:51:49 UTC 2007
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Mikkel L. Ellertson wrote:
> Steven Stern wrote:
>> After upgrading from FC6 to F7, I see the following as I boot
>>
>> Jul 3 22:04:43 sds-desk kernel: serial8250: too much work for irq17
>> Jul 3 22:04:43 sds-desk kernel: serial8250: too much work for irq17
>>
>> Is this serious?
>
> It is definitely strange. Where did you get a card using a 8250 UART
> that is using IRQ 17? I didn't think anybody used them any more, as
> they are a UART without a transmit/receive buffer. Considering that
> it would be generating an interrupt for each character, you would
> not want it on a high IRQ. On the other hand, the device is probably
> not reporting itself correctly. If it does have a 8250 UART on it,
> see if you can change the IRQ to 3 or 4.
>
> Mikkel
>
Here's some possible hardware (from /etc/sysconfig/hwconf)
class: OTHER
bus: PCI
detached: 0
desc: "Intel Corporation FA82537EP 56K V.92 Data/Fax Modem PCI"
vendorId: 8086
deviceId: 1080
subVendorId: 1028
subDeviceId: 1000
pciType: 1
pcidom: 0
pcibus: 4
pcidev: 1
pcifn: 0
Here's /proc/interrupts
$ cat /proc/interrupts
CPU0 CPU1
0: 294 0 IO-APIC-edge timer
1: 2274 2195 IO-APIC-edge i8042
7: 0 0 IO-APIC-edge parport0
8: 3 0 IO-APIC-edge rtc
9: 0 0 IO-APIC-fasteoi acpi
12: 70096 46743 IO-APIC-edge i8042
14: 56827 5962 IO-APIC-edge libata
15: 0 0 IO-APIC-edge libata
16: 48178 504269 IO-APIC-fasteoi wifi0,
radeon at pci:0000:01:00.0
18: 36 17 IO-APIC-fasteoi uhci_hcd:usb1, ehci_hcd:usb5
19: 94 0 IO-APIC-fasteoi uhci_hcd:usb2
20: 86179 232010 IO-APIC-fasteoi uhci_hcd:usb3, snd_ca0106
21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
22: 57133 25898 IO-APIC-fasteoi libata
NMI: 0 0
LOC: 5062797 5198387
ERR: 0
MIS: 0
- --
Steve
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