mirror of https://github.com/dswd/vpncloud.git
89 lines
2.7 KiB
Markdown
89 lines
2.7 KiB
Markdown
Performance Tests
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-----------------
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### Test setup
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Sender node:
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* Intel(R) Core(TM) i5-2540M CPU @ 2.60GHz
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* 8 GiB Ram
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* Intel 82579LM Gigabit Network
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* Ubuntu 14.04 (Kernel 3.13.0-65-generic)
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Receiver node:
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* Intel(R) Core(TM) i5-3450 CPU @ 3.10GHz
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* 16 GiB Ram
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* Realtek RTL8111/8168/8411 Gigabit Network
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* Ubuntu 14.04 (Kernel 3.13.0-63-generic)
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VpnCloud version: `VpnCloud v0.3.0, 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 $IFNAME 10.2.1.1/24 mtu 1400 up' &
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```
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and the receiver runs:
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```
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$> ./vpncloud -t tap -l RECEIVER:3210 -c SENDER:3210 \
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--ifup 'ifconfig $IFNAME 10.2.1.2/24 mtu 1400 up' &
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$> iperf -s &
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$> top
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```
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For encrypted tests, `--shared-key test --crypto METHOD` is appended.
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### Throughput
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The throughput is measured with the following command:
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```
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$> iperf -c DST -t 60
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```
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The test is run in 3 steps:
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* Native throughput without VpnCloud (`DST` is the native address of the receiver)
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* Throughput via VpnCloud (`DST` is `10.2.1.2`)
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* Encrypted throughput via VpnCloud (`DST` is `10.2.1.2`)
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| Throughput test | Bandwidth | CPU usage (one core) |
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| ----------------------------- | ------------- | -------------------- |
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| Without VpnCloud | 926 Mbits/sec | - |
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| Unencrypted VpnCloud | 873 Mbits/sec | 80% / 95% |
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| Encrypted VpnCloud (ChaCha20) | 770 Mbits/sec | 100% |
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| Encrypted VpnCloud (AES256) | 835 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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```
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$> ping DST -c 100000 -i 0.001 -s SIZE -U -q
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```
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For all the test, the best average RTT out of 5 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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| ----------------------------- | --------- | --------- | ---------- |
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| Without VpnCloud | 158 µs | 164 µs | 171 µs |
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| Unencrypted VpnCloud | 217 µs | 227 µs | 242 µs |
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| Difference | +59 µs | +63 µs | +71 µs |
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| Encrypted VpnCloud (ChaCha20) | 231 µs | 245 µs | 259 µs |
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| Difference | +14 µs | +18 µs | +17 µs |
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| Encrypted VpnCloud (AES256) | 223 µs | 237 µs | 251 µs |
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| Difference | +6 µs | +10 µs | +9 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.
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* VpnCloud adds about 70µs to the latency.
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* Encryption adds an additional latency up to 20µs depending on the packet size.
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