mirror of https://github.com/dswd/vpncloud.git
92 lines
2.1 KiB
Markdown
92 lines
2.1 KiB
Markdown
Performance Tests
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-----------------
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### Test setup
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Two nodes with:
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* 2x Intel(R) Xeon(R) CPU L5420
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* 16 GiB Ram
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* Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Kernel driver e1000e)
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* Debian Linux 7.0 (Kernel 2.6.32-26-pve)
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* Connected by Cisco Catalyst 4506 switch
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VpnCloud version: `VpnCloud v0.1.0 (without crypto support, protocol version 1)`
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### Test 1: Unencrypted throughput
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Node 1:
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```
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$> ./vpncloud -t tap -l NODE1:3210 -c NODE2:3210 \
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--ifup 'ifconfig $IFNAME 10.2.1.1/24 mtu MTU up' &
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```
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Node 2:
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```
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$> ./vpncloud -t tap -l NODE2:3210 -c NODE1:3210 \
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--ifup 'ifconfig $IFNAME 10.2.1.2/24 mtu MTU up' &
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$> iperf -s &
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$> top
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```
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First, the test is run **without VpnCloud**:
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```
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$> iperf -c NODE2 -t 60
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```
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and then **via VpnCloud**:
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```
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$> iperf -c 10.2.1.2 -t 60
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```
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**Results:**
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* Throughput without VpnCloud: 938 Mbits/sec
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* Throughput via VpnCloud (MTU=1400): 461 Mbits/sec
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* CPU usage for VpnCloud (MTU=1400): maxed out at ~105% of one core
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* Throughput via VpnCloud (MTU=16384): 949 Mbits/sec (no idea why this is higher)
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* CPU usage for VpnCloud (MTU=16384): ~68% of one core
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### Test 2: Unencrypted ping
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Node 1:
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```
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$> ./vpncloud -t tap -l NODE1:3210 -c NODE2:3210 \
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--ifup 'ifconfig $IFNAME 10.2.1.1/24 mtu 1400 up' &
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```
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Node 2:
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```
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$> ./vpncloud -t tap -l NODE2:3210 -c NODE1:3210 \
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--ifup 'ifconfig $IFNAME 10.2.1.2/24 mtu 1400 up' &
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```
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Each test is first run without VpnCloud:
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```
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$> ping NODE2 -c 1000 -i 0.01 -s SIZE -U -q
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```
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and then with VpnCloud:
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```
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$> ping 10.2.1.2 -c 1000 -i 0.01 -s SIZE -U -q
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```
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SIZE: 50 bytes
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* Without VpnCloud: Ø= 200 µs, stddev= 28 µs
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* With VpnCloud: Ø= 318 µs, stddev= 26 µs
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SIZE: 500 bytes
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* Without VpnCloud: Ø= 235 µs, stddev= 29 µs
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* With VpnCloud: Ø= 351 µs, stddev= 26 µs
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SIZE: 1400 bytes
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* Without VpnCloud: Ø= 303 µs, stddev= 32 µs
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* With VpnCloud: Ø= 421 µs, stddev= 31 µs
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### Conclusion
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* VpnCloud achieves about 460 MBit/s with default MTU settings.
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* At increased MTU, VpnCloud is able to saturate a Gigabit link.
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* VpnCloud adds about 120µs to the round trip times, i.e. 60µs latency increase.
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