kdump to remote host over NFS fails with integrated Broadcom 5719

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux 6.1 and 6.2
  • Broadcom 5719 (tg3 driver) as LOM (integrated)

Issue

  • kdump to remote host over NFS fails with integrated Broadcom 5719

Resolution

  • Add "pci=nomsi" to kernel command line when booting
  • This issue has been addressed in Red Hat Enterprise Linux 6.3

Diagnostic Steps

  • Message Signaled Interrupts (MSI) are another way of generating an interrupt to the CPU. In the past a device would contain a physical interrupt pin to send an interrupt from a device. Newer devices, such as network cards that utilize PCI-X, would lack this physical interrupt pin and would instead rely on the device to determine which interrupt to send to the CPU. During an MSI the data sent to the chipset would used by the device to determine which interrupt to trigger and on which CPU. This has the added benefit of increasing the number of possible interrupts that can be sent to the CPU. When you disable MSI by using the 'pci=nomsi' option it has the affect of disabling MSI across all devices.

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