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) |
+----------------------------------+
netstack microbenchmarks are in package netstack/bench; they can be run via the target netstack_bench_test.
To run the benchmarks and obtain profiling data:
REALM=bench PROFILE_PATH=/data/r/sys/r/$REALM/fuchsia.com:netstack-gotests:0#meta:netstack_bench_test.cmx/profile fx build netstack-gotests \ && fx test -o -R=$REALM netstack_bench_test \ && fx scp "[$(fx get-device-addr)]:$PROFILE_PATH" out/profile \ && go tool pprof -http=:8080 out/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