What is Intel Flow Director?

Solution Verified - Updated -

Issue

  • What is Intel Flow Director?
  • How does flow director affect the NICs and traffic?
  • Why do I have fdir_miss and fdir_match in ethtool -S ethX?
  • What are "Application Targeted Receive" (ATR) and "Perfect Filter" (PF) receive modes on Intel network cards?
  • What does ethtool -K ethX ntuple [on|off] do to an Intel X520?
  • We need to disable the intel flow director "feature" on our Intel 10Gb NICs, we believe this option is causing network performance issues

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Intel 82598, 82599, X520, X540, X550 or other network interface card using ixgbe driver

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