Netstack is a userspace TCP/IP network stack and interfaces with zircon network drivers. Netstack serves as a back-end for fdio socket API.
+-----------+ +-----------+
| FIDL app | | POSIX app |
+--+--------+ +-----+-----+
| |
| |
| |
| |
| |
| |
| +----------------------v---------+
| | BSD socket API |
| | (//sdk/lib/fdio) |
| +---------+----------------------+
| |
+--v-------------v----------------------+
| netstack |
| (//src/connectivity/network/netstack) |
+----------------+----------------------+
|
+----------------v-----------------+
| Ethernet driver |
| (//zircon/system/udev/ethernet) |
+----------------------------------+
To run the benchmarks and obtain profiling data:
fx test -o netstack-bench-gotests -- --test.run - --test.bench - \ && ffx test run --output-directory out/profile fuchsia-pkg://fuchsia.com/netstack-bench-gotests#meta/netstack-bench-gotests.cm \ && fx go tool pprof -http=:8080 out/profile/artifact-0/custom-0/netstack_bench_profile
Example output (astro):
goos: fuchsia goarch: arm64 pkg: netstack/bench BenchmarkWritePacket/checksumOffloadDisabled/len(payload)=2048-4 190443 6513 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadDisabled/len(payload)=1024-4 247176 4831 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadDisabled/len(payload)=512-4 326691 3842 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadDisabled/len(payload)=256-4 364168 3426 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadDisabled/len(payload)=128-4 394536 3282 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadDisabled/len(payload)=64-4 405102 3218 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadDisabled/len(payload)=32-4 423908 2967 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadDisabled/len(payload)=16-4 424617 2931 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadDisabled/len(payload)=8-4 386036 2935 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadDisabled/len(payload)=4-4 404241 2990 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadDisabled/len(payload)=2-4 371358 2887 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadDisabled/len(payload)=1-4 431478 2889 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadEnabled/len(payload)=2048-4 461614 2766 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadEnabled/len(payload)=1024-4 417296 2924 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadEnabled/len(payload)=512-4 474790 2814 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadEnabled/len(payload)=256-4 453231 2832 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadEnabled/len(payload)=128-4 472670 2835 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadEnabled/len(payload)=64-4 469988 2894 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadEnabled/len(payload)=32-4 490627 2614 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadEnabled/len(payload)=16-4 485992 2753 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadEnabled/len(payload)=8-4 492573 2798 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadEnabled/len(payload)=4-4 487836 2923 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadEnabled/len(payload)=2-4 434959 2658 ns/op 112 B/op 3 allocs/op BenchmarkWritePacket/checksumOffloadEnabled/len(payload)=1-4 490470 3010 ns/op 112 B/op 3 allocs/op
Netstack uses Sampler to forward Inspect diagnostics data to the Cobalt telemetry system. See the Sampler configuration for how Inspect counters map to Cobalt metrics and how often Inspect is polled; and the Cobalt configuration for the reports defined for each metric.