Re: IRQ (routing ?) problem [was Re: epic100 in current -ac kernels]

From: ARND BERGMANN (std7652@et.FH-Osnabrueck.DE)
Date: Thu Feb 15 2001 - 05:58:44 EST

Sorry for the delay, I could not get physical access to the machine
for the last days.

I was able to do some more testing today and found this:
- The problem is not the IRQ /sharing/, after getting rid of all the
  other PCI cards, the problem was still there.
- The only thing that seems to have any effect on the symptoms is the
  presence of the USB driver, either usb-uhci or uhci. I am not using
  USB at all. As described before, the system behaves is either of those
   * epic100 driver without DMA mapping (e.g. 2.4.0-ac9): normal operation
   * driver with DMA mapping+USB driver loaded: lots of interrupts -> slow
   * driver with DMA mapping, USB driver not loaded: hang after ~2 seconds
- I sometimes get 'spurious interrupt: IRQ7', even though no device is
  connected there. Probably not important.

On Sat, 10 Feb 2001, Francois Romieu wrote:

> The following informations may help:
> - motherboard type
Asus A7V, onboard USB hub and Promise ATA/100 chip

> - bios revision
Can't see right now, system was bought in October 2000
I think it was 1.004, but I am not sure.

> - lspci -x
see attachment, this was when I ripped out sound, tv and scsi

> - 2.4.2pre3 + whatever recent ac epic100 = ?
Still no improvement until latest -ac (2.4.1-ac13)

Arnd <><

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This archive was generated by hypermail 2b29 : Thu Feb 15 2001 - 21:00:26 EST