vpncloud/performance.md

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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
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* 16 GiB Ram
* Realtek RTL8111/8168/8411 Gigabit Network
* Ubuntu 14.04 (Kernel 3.13.0-63-generic)
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VpnCloud version: `VpnCloud v0.2.0 (with crypto support, protocol version 1)`
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The sender runs the following command:
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```
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$> ./vpncloud -t tap -l SENDER:3210 -c RECEIVER:3210 \
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--ifup 'ifconfig $IFNAME 10.2.1.1/24 mtu 1400 up' &
```
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and the receiver runs:
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```
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$> ./vpncloud -t tap -l RECEIVER:3210 -c SENDER:3210 \
--ifup 'ifconfig $IFNAME 10.2.1.2/24 mtu 1400 up' &
$> iperf -s &
$> top
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```
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For encrypted tests, `--shared-key test` is appended.
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### Throughput
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The throughput is measured with the following command:
```
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$> iperf -c DST -t 60
```
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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`)
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| 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% |
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### Latency
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The latency is measured with the following command:
```
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$> ping DST -c 10000 -i 0.001 -s SIZE -U -q
```
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For all the test, the best average RTT out of 5 runs is selected. The latency is
assumed to be half of the RTT.
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| 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 |
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### Conclusion
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* 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.