| Estimated prep. time | Estimated runtime |
|---|---|
| 0h 45m | 1h 30m |
Network throughput (iPerf) with Unikraft (baseline), FlexOS w/o isolation, with 2 compartments backed by MPK (-light = shared call stacks, -dss = protected and DSS) and EPT.
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Problem: EPT measurements show very low performance, not achieving more than a few 100Mb/s.
Solution: This is typically due to pinning issues. EPT measurements are not all pinned like MPK measurements for technical reasons, and they use 4 non-isolated cores. If these cores are improperly set (different NUMA node than isolated ones, noise on them), this might result in drastic loss of performance.
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Problem: All measurements are blocked at 1.9-2.0Gb/s (while they should achieve around 3Gb/s).
Solution: This issue seems to happen from time to time even in correct setups, and we do not have a good explanation for it. iPerf is an extremely sensitive benchmark that involves not only two different TCP stacks (guest plus the host) but also very complex TCP behaviors. In this case the solution was generally to restart the machine with
reboot.