Performance Tests ----------------- ### Test setup Sender node: * Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz * 8 GiB Ram * Intel 82579LM Gigabit Network * Ubuntu 14.04 (Kernel 3.13.0-65-generic) Receiver node: * Intel(R) Core(TM) i5-3450 CPU @ 3.10GHz * 16 GiB Ram * Realtek RTL8111/8168/8411 Gigabit Network * Ubuntu 14.04 (Kernel 3.13.0-63-generic) VpnCloud version: `VpnCloud v0.2.0 (with crypto support, protocol version 1)` The sender runs the following command: ``` $> ./vpncloud -t tap -l SENDER:3210 -c RECEIVER:3210 \ --ifup 'ifconfig $IFNAME 10.2.1.1/24 mtu 1400 up' & ``` and the receiver runs: ``` $> ./vpncloud -t tap -l RECEIVER:3210 -c SENDER:3210 \ --ifup 'ifconfig $IFNAME 10.2.1.2/24 mtu 1400 up' & $> iperf -s & $> top ``` For encrypted tests, `--shared-key test` is appended. ### Throughput The throughput is measured with the following command: ``` $> iperf -c DST -t 60 ``` The test is run in 3 steps: * Native throughput without VpnCloud (`DST` is the native address of the receiver) * Throughput via VpnCloud (`DST` is `10.2.1.2`) * Encrypted throughput via VpnCloud (`DST` is `10.2.1.2`) | Throughput test | Bandwidth | CPU usage (one core) | | -------------------- | ------------- | -------------------- | | Without VpnCloud | 926 Mbits/sec | - | | Unencrypted VpnCloud | 873 Mbits/sec | 80% / 95% | | Encrypted VpnCloud | 635 Mbits/sec | 100% | ### Latency The latency is measured with the following command: ``` $> ping DST -c 10000 -i 0.001 -s SIZE -U -q ``` For all the test, the best average RTT out of 5 runs is selected. The latency is assumed to be half of the RTT. | Payload size | 100 bytes | 500 bytes | 1000 bytes | | -------------------- | --------- | --------- | ---------- | | Without VpnCloud | 158 µs | 165 µs | 178 µs | | Unencrypted VpnCloud | 210 µs | 216 µs | 237 µs | | Difference | +52 µs | +51 µs | +59 µs | | Encrypted VpnCloud | 225 µs | 252 µs | 262 µs | | Difference | +15 µs | +36 µs | +25 µs | ### Conclusion * VpnCloud achieves over 850 MBit/s with default MTU settings. * In encrypted mode, VpnCloud reaches over 600 MBit/s with default MTU settings. * VpnCloud adds about 60µs to the latency. * Encryption adds an additional latency between 10µs and 35µs depending on the packet size.