OSADL QA Farm on Real-time of Mainline Linux
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Round-trip time plot of peer-to-peer UDP duplex link
Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 Special All - All RT - Optimization - Ethernet - Thumbnails |
Real-time Ethernet round-trip-time histogram - no concurrent load (Latency monitoring)

Real-time Ethernet round-trip-time histogram - concurrent load of 10 Mb/s (Latency monitoring)

Real-time Ethernet round-trip-time histogram - concurrent load of 50 Mb/s (Latency monitoring)

Note that at least one system runs a non-RT kernel (x scale expanded to 2000 µs).
Data to construct the above plot have been generated using the RT test utility cyclictest.