• SteveTech@programming.devEnglish
      1·
      1 year ago

      Alright, so testing with iperf3 to a 10G host:

      • Single Direction - 7.06 Gbps RX (2.35, 2.35, 1.25, 1.11 Gbps individually), 9.4 Gbps TX (All 2.35 Gbps)
      • Bidirectionally - 8 Gbps Total, 1.538 Gbps RX & 6.55 Gbps TX (315/1220, 232/2080, 256/1520, 735/1730 Mbps individually)

      4x USB NICs on the laptop, 1x Solarflare SFN5122F NIC on the desktop, there were 2 10G switches in between which may have affected the speeds slightly.

      Also I can get 4.6 Gbps total (2.3/2.3) bidirectionally on one interface, so I would have expected ~16 Gbps with 4, so that’s interesting I guess? My desktop can do 18.6 Gbps total (9.55/9.11) to my server so idk.

      Edit: I was using 1500 MTU, I don’t feel like testing again with jumbo frames.

      • AVincentInSpaceEnglish
        2·
        1 year ago

        Fascinating, especially that the RX direction saw such varied speeds across the various NICs. Guess that switch wasn’t too keen on trying to split the packets evenly. Also – 1.5Gbit RX in bidirectional mode? …all I can say is yikes.

        Very good to know.

        @slice@feddit.de – you were interested in this too

        • SteveTech@programming.devEnglish
          2·
          1 year ago

          Guess that switch wasn’t too keen on trying to split the packets evenly.

          Yeah probably, I was just using one of those cheap 2x 10G + 4x 2.5G switches that ServeTheHome recently did a video on, so I would not be surprised if that was the bottle neck here.

          I could maybe try buying a few more SFP+ transceivers and using my more trustworthy switches, but that seems too expensive for a project like this.