This is a test result example for a working server available: Running 'iperf -y c -c 10.246.72.3 -t 300 -P 5 ' Linux 4.4.0-130-generic (s2lp3) 07/09/2018 _s390x_ (4 CPU) 04:48:05 AM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle 04:49:05 AM all 0.05 0.00 8.44 0.00 0.22 8.46 0.04 0.00 0.00 82.79 04:49:05 AM 0 0.07 0.00 9.45 0.00 0.22 7.87 0.03 0.00 0.00 82.37 04:49:05 AM 1 0.03 0.00 8.65 0.00 0.17 4.05 0.02 0.00 0.00 87.08 04:49:05 AM 2 0.05 0.00 5.32 0.00 0.32 19.46 0.07 0.00 0.00 74.79 04:49:05 AM 3 0.05 0.00 10.36 0.00 0.22 2.43 0.03 0.00 0.00 86.90 04:49:05 AM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle 04:50:05 AM all 0.03 0.00 7.21 0.00 0.22 8.21 0.03 0.00 0.00 84.30 04:50:05 AM 0 0.03 0.00 6.78 0.00 0.18 7.20 0.03 0.00 0.00 85.76 04:50:05 AM 1 0.03 0.00 7.70 0.00 0.17 2.92 0.03 0.00 0.00 89.15 04:50:05 AM 2 0.05 0.00 3.75 0.00 0.32 20.83 0.05 0.00 0.00 75.00 04:50:05 AM 3 0.02 0.00 10.62 0.00 0.20 1.90 0.02 0.00 0.00 87.25 04:50:05 AM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle 04:51:05 AM all 0.05 0.00 6.73 0.00 0.24 9.26 0.03 0.00 0.00 83.69 04:51:05 AM 0 0.05 0.00 6.48 0.00 0.20 6.90 0.02 0.00 0.00 86.35 04:51:05 AM 1 0.02 0.00 6.05 0.00 0.15 3.45 0.02 0.00 0.00 90.32 04:51:05 AM 2 0.05 0.00 4.68 0.00 0.35 24.15 0.05 0.00 0.00 70.71 04:51:05 AM 3 0.05 0.00 9.72 0.00 0.25 2.53 0.02 0.00 0.00 87.43 04:51:05 AM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle 04:52:05 AM all 0.03 0.00 7.77 0.00 0.22 8.02 0.04 0.00 0.00 83.92 04:52:05 AM 0 0.05 0.00 8.98 0.00 0.20 6.03 0.05 0.00 0.00 84.69 04:52:05 AM 1 0.03 0.00 7.90 0.00 0.17 4.03 0.02 0.00 0.00 87.85 04:52:05 AM 2 0.05 0.00 5.00 0.00 0.32 19.80 0.07 0.00 0.00 74.77 04:52:05 AM 3 0.02 0.00 9.15 0.00 0.20 2.23 0.02 0.00 0.00 88.38 04:52:05 AM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle 04:53:05 AM all 0.07 0.00 7.84 0.00 0.24 8.65 0.05 0.00 0.00 83.15 04:53:05 AM 0 0.07 0.00 10.25 0.00 0.20 5.35 0.03 0.00 0.00 84.10 04:53:05 AM 1 0.07 0.00 6.85 0.00 0.17 4.05 0.03 0.00 0.00 88.84 04:53:05 AM 2 0.08 0.00 4.13 0.00 0.37 23.11 0.12 0.00 0.00 72.19 04:53:05 AM 3 0.05 0.00 10.14 0.00 0.22 2.10 0.02 0.00 0.00 87.48 Average: CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle Average: all 0.05 0.00 7.60 0.00 0.23 8.52 0.04 0.00 0.00 83.57 Average: 0 0.05 0.00 8.39 0.00 0.20 6.67 0.03 0.00 0.00 84.65 Average: 1 0.04 0.00 7.43 0.00 0.16 3.70 0.02 0.00 0.00 88.65 Average: 2 0.06 0.00 4.58 0.00 0.33 21.47 0.07 0.00 0.00 73.49 Average: 3 0.04 0.00 10.00 0.00 0.22 2.24 0.02 0.00 0.00 87.49