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+---
+title: "Performance tests"
+date:  2019-06-22
+draft: false
+---
+
+Below you will find some measurements on the performance of Ouroboros.
+
+### Local IPC performance test
+
+This test uses the *oping* tool to measure round trip time. This tools
+generates traffic from a single thread. The server has a single thread
+that handles ping requests and sends responses.
+
+```
+$ oping -n oping -i 0 -s <sdu size>
+```
+
+The figure below shows the round-trip-time (rtt) in milliseconds (ms)
+for IPC over a local layer for different packet sizes, measured on an
+Intel Core i7 4500U (2 cores @ 2.4GHz). For small payloads (up to 1500
+bytes), the rtt is quite stable at around 30 µs. This will mostly depend
+on CPU frequency and to a lesser extent the OS scheduler.
+
+![Ouroboros local rtt](/images/avgrttlocal.png)
+
+This test uses the *ocbr* tool to measure goodput between a sender and
+receiver. The sender generates traffic from a single thread. The
+receiver handles traffic from a single thread. The performance will
+heavily depend on your system's memory layout (cache sizes etc). This
+test was run on a Dell XPS13 9333 (2013 model).
+
+```
+$ ocbr -n ocbr -f -s <sdu size>
+```
+
+![Ouroboros local pps](/images/throughputlocalpps.png)
+
+The goodput (Mb/s) is shown below:
+
+![ouroboros local mbits](/images/goodputlocalmbits.png)
+
+### Ethernet + Normal test
+
+This connects 2 machines over a Gb LAN using the eth-dix and a normal
+layer. The oping server is registered in the dix as oping.dix and in the
+normal as oping.normal. The machines (dual-socket Intel Xeon E5520) are
+connected over a non-blocking switch.
+
+Latency test:
+
+ICMP ping:
+
+```
+--- 192.168.1.2 ping statistics ---
+1000 packets transmitted, 1000 received, 0% packet loss, time 65ms
+rtt min/avg/max/mdev = 0.046/0.049/0.083/0.002 ms, ipg/ewma 0.065/0.049 ms
+```
+
+oping over eth-dix:
+
+```
+--- oping.dix ping statistics ---
+1000 SDUs transmitted, 1000 received, 0% packet loss, time: 66.142 ms
+rtt min/avg/max/mdev = 0.098/0.112/0.290/0.010 ms
+```
+
+oping over eth-normal:
+
+```
+--- oping.normal ping statistics ---
+1000 SDUs transmitted, 1000 received, 0% packet loss, time: 71.532 ms
+rtt min/avg/max/mdev = 0.143/0.180/0.373/0.020 ms
+```
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