Tuning intr_throttling low without a patch for ixgbe bug 15814880 may trigger ixgbe resets and FMA events (Doc ID 1902887.1)

Last updated on JULY 29, 2016

Applies to:

Solaris Operating System - Version 10 3/05 to 11.1 [Release 10.0 to 11.0]
Information in this document applies to any platform.

Symptoms

Systems which have tuned the ixgbe.conf intr_throttling parameter (which controls the maximum "interrupt blanking" period) to a low value - particularly if less than 40 - may experience FMA faults, FMA error reports (ereports) and ixgbe chip resets (the reset_count will increment). 

The overall  impact on the system may vary, from an almost complete loss of network connectivity to only the FMA faults themselves. 

The FMA fault typically would be a PCIEX-8000-MH, although other types of PCIEX have been seen.   The device path would be that of an ixgbe interface.   There also may be a number of ereports noting "downgraded"  and then "restored"  - these might continue for a while after the FMA fault is recorded.  

Cause

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