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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
  • 16 GiB Ram
  • Realtek RTL8111/8168/8411 Gigabit Network
  • Ubuntu 14.04 (Kernel 3.13.0-63-generic)

VpnCloud version: VpnCloud v0.5.0, protocol version 1, libsodium 1.0.10 (AES256: true)

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 --crypto METHOD is appended.

For increased MTU tests mtu 7000 is used in --ifup.

Throughput

The throughput is measured with the following command:

$> iperf -c DST -t 30

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 923 Mbits/sec -
Unencrypted VpnCloud 877 Mbits/sec 85% / 95%
Encrypted VpnCloud (ChaCha20) 760 Mbits/sec 90% / 90%
Encrypted VpnCloud (AES256) 824 Mbits/sec 85% / 85%
Unencrypted VpnCloud (MTU 7000) 943 Mbits/sec 75% / 75%
Encrypted VpnCloud (ChaCha20, MTU 7000) 922 Mbits/sec 75% / 75%
Encrypted VpnCloud (AES256, MTU 7000) 928 Mbits/sec 75% / 75%

Latency

The latency is measured with the following command:

$> ping DST -c 30000 -i 0.001 -s SIZE -U -q

For all the test, the best average RTT out of 3 runs is selected. The latency is assumed to be half of the RTT.

Payload size 100 bytes 500 bytes 1000 bytes
Without VpnCloud 159 µs 167 µs 174 µs
Unencrypted VpnCloud 220 µs (+61 µs) 228 µs (+61 µs) 238 µs (+64 µs)
Encrypted VpnCloud (ChaCha20) 230 µs (+10 µs) 246 µs (+18 µs) 263 µs (+25 µs)
Encrypted VpnCloud (AES256) 227 µs ( +7 µs) 241 µs (+13 µs) 258 µs (+20 µs)

Conclusion

  • VpnCloud achieves over 850 MBit/s with default MTU settings.
  • In encrypted mode, VpnCloud reaches over 800 MBit/s with default MTU settings.
  • With increased MTU, VpnCloud reaches over 900 Mbit/s, encrypted and unencrypted.
  • VpnCloud adds about 70µs to the latency.
  • Encryption adds an additional latency up to 20µs.