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    SubjectRe: MSI failure on nForce 430 (WAS: intel 82571EB gigabit fails to see link on 2.6.20-rc5 in-tree e1000 driver (regression))
    Adrian Bunk wrote:
    > On Sat, Jan 20, 2007 at 02:34:37PM -0500, Adam Kropelin wrote:
    >> (cc: list trimmed and thread moved to linux-pci)
    >>
    >> I have a PCI-E e1000 card that does not see interrupts on 2.6.20-rc5
    >> unless CONFIG_PCI_MSI is disabled. An e1000 maintainer indicated that
    >> the PHY state is correct, it's just that the interrupt is not getting
    >> thru to the kernel. Interestingly, on 2.6.19 PHY interrupts get thru ok
    >> with MSI enabled (link status responds appropriately) but packet tx
    >> fails with timeout errors, implying that perhaps MAC interrupts are not
    >> arriving.
    >>
    >> I've attached the contents dmesg, 'lspci -vvv', and 'cat
    >> /proc/interrupts' from 2.6.20-rc5.
    >>
    >> This is an nForce 430 based chipset on a Dell E521 which has had
    >> interrupt routing issues before. Prior to 2.6.19 it had to be booted
    >> with 'noapic' in order to come up at all. It also had USB lockup
    >> problems until I applied the latest BIOS update (v1.1.4). So a BIOS
    >> interrupt routing bug with MSI is not out of the question.
    >>
    >> I'm happy to gather more data or run tests...
    >
    > Was this regression fixed by Eric's patch that is included in -rc7?

    no, this is a different issue afaics. Eric's patch solves a msi vector leak
    where MSI's were no longer recovered after all 256 of them were handed out. The
    issue here seems to be a very different regression (no vector at all or vector
    not setup correctly to begin with).

    I do suggest re-testing the issue with 2.6.20rc7, but it's unlikely it fixes the
    problem for Adam.

    The same issue was reported 2/3 days ago by another user basically too (no
    interrupts at all arriving with MSI enabled).

    Cheers,

    Auke
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