2 Replies Latest reply on May 20, 2015 3:24 PM by dlowe

    Decrease latency

      I have three identical clusters using


      mlx4_core: Mellanox ConnectX core driver v2.2-1 (Feb, 2014)

      mlx4_en: Mellanox ConnectX HCA Ethernet driver v2.2-1 (Feb 2014)

      <mlx4_ib> mlx4_ib_add: mlx4_ib: Mellanox ConnectX InfiniBand driver v2.2-1 (Feb 2014) 40G


      My cards are single port

      CA 'mlx4_0'

          CA type: MT4099

          Number of ports: 1

          Firmware version: 2.31.5050

          Hardware version: 0

          Node GUID: 0xf45214030057a450

          System image GUID: 0xf45214030057a453

          Port 1:

              State: Active

              Physical state: LinkUp

              Rate: 40

              Base lid: 3

              LMC: 0

              SM lid: 1

              Capability mask: 0x02514868

              Port GUID: 0xf45214030057a451

              Link layer: InfiniBand


      Two of my systems give me an average of .17ms latency. The third system is .38ms. There is no load on any of the systems when I am running the ibping test. Does anyone have an idea on what may be causing this or a suggestion on where/what to look at?