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## Test configuration
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Performance testing was done on a server with following specifications:
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* **CPU**: Intel Xeon E5-2620@2.00 GHz
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* **RAM**: 32 GB DDR3@1600 Mhz
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* **OS**: Debian, linux kernel 5.4.0
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* **NIC**: Intel X-520-2, 2x 10 Gb
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DNS traffic to this server was generated and sent by Spirent TestCenter SPT-2000A through a 10 Gbps line.
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All DNS traffic was sent over UDP with 33% of queries and responses containing EDNS record.
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DNS Probe was run with default Sysrepo configuration with only `export-format` changed to `cdns` when measuring C-DNS performance and `coremask` changed to correspond with the number of packet processing threads shown in the table in section [Test results](#test-results).
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## Test results
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The following table contains results of the performance tests for DNS Probe. DNS Probe was run in four
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different configurations depending on the packet processing backend and export format used.
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| Probe configuration (pkts/s) / Packet processing threads | 1 | 2 | 4 |
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|----------------------------------------------------------|---|---|---|
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| DPDK - Parquet | 718 000 | 1 441 000 | 2 647 000 |
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| DPDK - C-DNS | 1 420 000 | 2 739 000 | 5 176 000 |
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| AF_PACKET - Parquet | 487 000 | 780 000 | 1 350 000 |
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| AF_PACKET - C-DNS | 805 000 | 1 242 000 | 2 017 000 |
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The following table contains the same measurements as the table above, only with the numbers converted
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to Gbps.
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| Probe configuration (Gbps) / Packet processing threads | 1 | 2 | 4 |
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|--------------------------------------------------------|---|---|---|
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| DPDK - Parquet | 1,20 | 2,42 | 4,44 |
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| DPDK - C-DNS | 2,38 | 4,60 | 8,69 |
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| AF_PACKET - Parquet | 0,81 | 1,31 | 2,26 |
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| AF_PACKET - C-DNS | 1,35 | 2,00 | 3,39 | |
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\ No newline at end of file |