mlx4_en loses IP connectivity

Solution Unverified - Updated -

Issue

  • There seems to be something wrong with the mlx4_en driver or firmware in RHEL 6 Update 4
  • The symptom is that after a while under high load it stops responding to IP packets but it does see them if you put the card into promiscuous mode.
  • It seems to be tied to multicast and bonding and both of those mess with the the MAC addr table in the card.
  • It just drops off the net and quits responding.
  • We replaced the driver with the one from 6.2 and then tested it all day with no problems.
  • Switching back to the 6.4 driver we had a failure in about 40min.
  • By playing with ethtool and changing some settings we were able to reduce the rate of failure but not completely eliminate it.

Environment

  • Red Hat Enterprise 6 Update 4

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