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    SubjectRe: intel 82571EB gigabit fails to see link on 2.6.20-rc5 in-tree e1000 driver (regression)
    On 1/16/07, Allen Parker <parker@isohunt.com> wrote:
    > Allen Parker wrote:
    > > I have a PCI-E pro/1000 MT Quad Port adapter, which works quite well
    > > under 2.6.19.2 but fails to see link under 2.6.20-rc5. Earlier today I
    > > reported this to e1000-devel@lists.sf.net, but thought I should get the
    > > word out in case someone else is testing this kernel on this nic chipset.

    Upon some further investigation with Allen, I got this info, and it
    appears that his system is not freeing MSI irq's correctly.

    from our discussion:
    > Allen wrote:
    >> Jesse Brandeburg wrote:
    >> I believe you may have an interrupt delivery problem, due to kernel
    >> changes. When you don't get interrupts delivered correctly, you may
    >> not achieve link up.
    >>
    >> you can try disabling CONFIG_PCI_MSI in the kernel, as another
    >> trouble shooting step. Also, what model motherboard/machine are you
    >> using, and please check to make sure your BIOS is up to date.
    >
    > CONFIG_PCI_MSI seems to fix it as well, however, i'm not sure about
    > possible performance implications with leaving it turned off.
    >
    > Tyan S2927G2NR w/ 2x Opteron 2210 bios rev 1.02 iirc

    Also, here is an excerpt of his his proc/interrupts
    Allen Parker wrote:
    CPU0 CPU1 CPU2 CPU3
    498: 1 8 129 8723 PCI-MSI-edge eth3
    499: 0 42 122 17135 PCI-MSI-edge eth2
    500: 0 19 275 1418326 PCI-MSI-edge eth1
    501: 0 0 0 0 PCI-MSI-edge eth1
    502: 0 414 26 25227 PCI-MSI-edge eth1
    503: 0 37 264 1418695 PCI-MSI-edge eth0
    504: 0 0 0 139 PCI-MSI-edge eth0
    505: 0 6 714 22806 PCI-MSI-edge eth0
    NMI: 275 207 225 262
    LOC:3531851 3531829 3531805 3531778
    ERR: 0

    The disturbing bit is that on this Hypertransport to PCIe system, his
    interrupts appear to be getting registered multiple times on different
    IRQ numbers.

    help?
    -
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