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vpncloud/performance.md

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Performance Tests

Test setup

Two nodes with:

  • 2x Intel(R) Xeon(R) CPU L5420
  • 16 GiB Ram
  • Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Kernel driver e1000e)
  • Debian Linux 7.0 (Kernel 2.6.32-26-pve)
  • Connected by Cisco Catalyst 4506 switch

VpnCloud version: VpnCloud v0.1.0 (without crypto support, protocol version 1)

Test 1: Unencrypted throughput

Node 1:

$> ./vpncloud -t tap -l NODE1:3210 -c NODE2:3210 \
   --ifup 'ifconfig $IFNAME 10.2.1.1/24 mtu MTU up' &

Node 2:

$> ./vpncloud -t tap -l NODE2:3210 -c NODE1:3210 \
   --ifup 'ifconfig $IFNAME 10.2.1.2/24 mtu MTU up' &
$> iperf -s &
$> top

First, the test is run without VpnCloud:

$> iperf -c NODE2 -t 60

and then via VpnCloud:

$> iperf -c 10.2.1.2 -t 60

Results:

  • Throughput without VpnCloud: 938 Mbits/sec
  • Throughput via VpnCloud (MTU=1400): 363 Mbits/sec
  • CPU usage for VpnCloud (MTU=1400): maxed out at ~105% of one core
  • Throughput via VpnCloud (MTU=16384): 946 Mbits/sec (no idea why this is higher)
  • CPU usage for VpnCloud (MTU=16384): ~73% of one core

Test 2: Unencrypted ping

Node 1:

$> ./vpncloud -t tap -l NODE1:3210 -c NODE2:3210 \
   --ifup 'ifconfig $IFNAME 10.2.1.1/24 mtu 1400 up' &

Node 2:

$> ./vpncloud -t tap -l NODE2:3210 -c NODE1:3210 \
   --ifup 'ifconfig $IFNAME 10.2.1.2/24 mtu 1400 up' &

Each test is first run without VpnCloud:

$> ping NODE2 -c 1000 -i 0.01 -s SIZE -U -q

and then with VpnCloud:

$> ping 10.2.1.2 -c 1000 -i 0.01 -s SIZE -U -q

SIZE: 50 bytes

  • Without VpnCloud: Ø= 200 µs, stddev= 28 µs
  • With VpnCloud: Ø= 318 µs, stddev= 26 µs

SIZE: 500 bytes

  • Without VpnCloud: Ø= 235 µs, stddev= 29 µs
  • With VpnCloud: Ø= 351 µs, stddev= 26 µs

SIZE: 1400 bytes

  • Without VpnCloud: Ø= 303 µs, stddev= 32 µs
  • With VpnCloud: Ø= 421 µs, stddev= 31 µs

Conclusion

  • VpnCloud achieves about 360 MBit/s with default MTU settings.
  • At increased MTU, VpnCloud is able to saturate a Gigabit link.
  • VpnCloud adds about 120µs to the round trip times, i.e. 60µs latency increase.