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 v0.3.1, protocol version 1, libsodium 1.0.7 (AES256: true)`
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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 &
$> top
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```
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For encrypted tests, `--shared-key test --crypto METHOD` is appended.
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### Throughput
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The throughput is measured with the following command:
```
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$> 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 | - |
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| Unencrypted VpnCloud | 875 Mbits/sec | 80% / 95% |
| Encrypted VpnCloud (ChaCha20) | 799 Mbits/sec | 100% |
| Encrypted VpnCloud (AES256) | 837 Mbits/sec | 90% / 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 100000 -i 0.001 -s SIZE -U -q
```
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For all the test, the best average RTT out of 3 runs is selected. The latency is
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assumed to be half of the RTT.
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| Payload size | 100 bytes | 500 bytes | 1000 bytes |
| ----------------------------- | --------- | --------- | ---------- |
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| Without VpnCloud | 158 µs | 164 µs | 171 µs |
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| Unencrypted VpnCloud | 208 µs | 225 µs | 236 µs |
| Difference | +50 µs | +61 µs | +65 µs |
| Encrypted VpnCloud (ChaCha20) | 229 µs | 242 µs | 259 µs |
| Difference | +21 µs | +17 µs | +23 µs |
| Encrypted VpnCloud (AES256) | 223 µs | 232 µs | 249 µs |
| Difference | +15 µs | +7 µs | +13 µs |
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### Conclusion
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* VpnCloud achieves over 850 MBit/s with default MTU settings.
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* In encrypted mode, VpnCloud reaches over 800 MBit/s with default MTU settings.
* VpnCloud adds about 70µs to the latency.
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* Encryption adds an additional latency up to 20µs.