RohanRaghav Running pts/iperf-1.0.0 via the Phoronix Test Suite. iperfguest: Processor: Intel Core @ 2.90GHz (1 Core), Motherboard: QEMU Standard PC (i440FX + PIIX 1996), Chipset: Intel 440FX- 82441FX PMC, Memory: 1024MB, Disk: 21GB QEMU HDD, Graphics: LLVMpipe, Audio: QEMU Generic, Network: Realtek RTL-8100/8101L/8139 OS: Ubuntu 16.04, Kernel: 4.8.0-36-generic (x86_64), Desktop: Unity 7.4.0, Display Server: X Server 1.18.4, Display Driver: modesetting 1.18.4, OpenGL: 3.3 Mesa 12.0.6 Gallium 0.4, Compiler: GCC 5.4.0 20160609, File-System: ext4, Screen Resolution: 1024x768, System Layer: qemu iperfVM6Gigs: Processor: 4 x Intel Core (Broadwell no TSX) @ 2.90GHz (4 Cores), Motherboard: QEMU Standard PC (i440FX + PIIX 1996), Chipset: Intel 440FX- 82441FX PMC, Memory: 8192MB, Disk: 21GB QEMU HDD, Graphics: LLVMpipe, Audio: QEMU Generic, Network: Realtek RTL-8100/8101L/8139 OS: Ubuntu 16.04, Kernel: 4.8.0-36-generic (x86_64), Desktop: Unity 7.4.0, Display Server: X Server 1.18.4, Display Driver: modesetting 1.18.4, OpenGL: 3.3 Mesa 12.0.6 Gallium 0.4, Compiler: GCC 5.4.0 20160609, File-System: ext4, Screen Resolution: 1024x768, System Layer: qemu iperfVM7Gigs: Processor: 4 x Intel Core (Broadwell no TSX) @ 2.90GHz (4 Cores), Motherboard: QEMU Standard PC (i440FX + PIIX 1996), Chipset: Intel 440FX- 82441FX PMC, Memory: 8192MB, Disk: 21GB QEMU HDD, Graphics: LLVMpipe, Audio: QEMU Generic, Network: Realtek RTL-8100/8101L/8139 OS: Ubuntu 16.04, Kernel: 4.8.0-36-generic (x86_64), Desktop: Unity 7.4.0, Display Server: X Server 1.18.4, Display Driver: modesetting 1.18.4, OpenGL: 3.3 Mesa 12.0.6 Gallium 0.4, Compiler: GCC 5.4.0 20160609, File-System: ext4, Screen Resolution: 1024x768, System Layer: qemu iperfVM7Gigs1: Processor: 4 x Intel Core (Broadwell no TSX) @ 2.90GHz (4 Cores), Motherboard: QEMU Standard PC (i440FX + PIIX 1996), Chipset: Intel 440FX- 82441FX PMC, Memory: 8192MB, Disk: 21GB QEMU HDD, Graphics: LLVMpipe, Audio: QEMU Generic, Network: Realtek RTL-8100/8101L/8139 OS: Ubuntu 16.04, Kernel: 4.8.0-36-generic (x86_64), Desktop: Unity 7.4.0, Display Server: X Server 1.18.4, Display Driver: modesetting 1.18.4, OpenGL: 3.3 Mesa 12.0.6 Gallium 0.4, Compiler: GCC 5.4.0 20160609, File-System: ext4, Screen Resolution: 1024x768, System Layer: qemu iPerf 3.1.3 Server Address: 192.168.0.26 - Server Port: 5201 - Duration: 60 Seconds - Test: TCP - Parallel: 1 Mbits/sec > Higher Is Better iperfguest .... 34.05 |========================================== iperfVM6Gigs .. 35.12 |=========================================== iperfVM7Gigs .. 45.80 |======================================================== iperfVM7Gigs1 . 44.60 |=======================================================