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    SubjectIRQ (routing ?) problem [was Re: epic100 in current -ac kernels]
    ARND BERGMANN <std7652@et.FH-Osnabrueck.DE> écrit :
    [...]
    > > > > > Working epic100 drivers:
    > > > > > - 2.4.0
    > > > > > - 2.4.0-ac9
    > > > >
    > > > > Could you give a look at ac12 (fine here) ?
    > > > >
    > > > No, does not work, same problem.
    > >
    > > The modifications between ac9 and ac12 come from the new DMA
    > > mapping.
    > What about 2.4.0-ac5? That had the same problem as -ac12. Did it also have
    > the new DMA mapping?

    Yes. For completness (though irrelevant):
    2.4.0-ac2 -> ac6 : DMA mapping + rev9 fixes from Andreas Steinmetz
    2.4.0-ac7 -> ac10: Merge becker version 1.11 + pci_enable. No DMA mapping
    2.4.0-ac11 : Merge becker version 1.11 + pci_enable + DMA mapping

    [...]
    > > They added a bug for the (already buggy ?) big-endian
    > > machines. I would be surprised that something has *always* been
    > > missing in the driver and your hardware triggers it*. IMHO the culprit
    > > is to be found elsewhere.
    > Yes, I'm pretty sure the problem is not only the epic100 driver, now that
    > I have done some more investigation. With the broken drivers (I tried
    > 2.4.0-ac12 and 2.4.1-ac5), something generates an enourmous amount of
    > interrupts as soon as I run 'ifconfig eth0 up'. Within 10 seconds, I got
    > roughly 950000 interrupts on IRQ11, instead of 30!
    ^^^^^^
    No wonder the system feels sluggish.

    > After disabling the usb-uhci (I was using the JE driver) in the BIOS
    > setup, the system reproducibly locked up hard a few seconds after
    > 'ifconfig eth0 up' instead of just getting slow.

    The following informations may help:
    - motherboard type
    - bios revision
    - lspci -x
    - 2.4.2pre3 + whatever recent ac epic100 = ?

    --
    Ueimor
    -
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