Internal timer on the Mellanox card runs significantly faster than the default one obtained via CLOCK_REALTIME while using real-time kernel

Solution Verified - Updated -

Issue

On the real-time kernel the PHC timer on the Mellanox card ticks significantly faster than the system clock obtained via CLOCK_REALTIME. Changing the timer frequency with the phc_ctl tool does not help.

Environment

  • Red Hat Enterprise MRG Realtime
  • Kernel version 3.10.0-327.rt56.198.el6rt.x86_64
  • Mellanox IB/10G card: HP 2P 4X FDR VPI/2P 40GbE CX-3 HCA 649281-B21

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