go: crypto/tls: linux/arm64 Go 1.8 performance is slow, max 12.5 MB/sec

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version go1.8 linux/arm64

What operating system and processor architecture are you using (go env)?

96-core Cavium ThunderX, Packet type “2A” server

root@docker-build-test:~# go env
GOARCH="arm64"
GOBIN=""
GOEXE=""
GOHOSTARCH="arm64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/root"
GORACE=""
GOROOT="/usr/lib/go-1.8"
GOTOOLDIR="/usr/lib/go-1.8/pkg/tool/linux_arm64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build192910166=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"

What did you do?

root@docker-build-test:~# go test crypto/tls -bench BenchmarkThroughput

What did you expect to see?

TLS performance on my 96-core ARMv8 server faster than my laptop.

What did you see instead?

root@docker-build-test:~# go test crypto/tls -bench BenchmarkThroughput

BenchmarkThroughput/MaxPacket/1MB-96                  10         128291858 ns/op    8.17 MB/s
BenchmarkThroughput/MaxPacket/2MB-96                   5         211866625 ns/op    9.90 MB/s
BenchmarkThroughput/MaxPacket/4MB-96                   3         378852259 ns/op   11.07 MB/s
BenchmarkThroughput/MaxPacket/8MB-96                   2         715603298 ns/op   11.72 MB/s
BenchmarkThroughput/MaxPacket/16MB-96                  1        1387017225 ns/op   12.10 MB/s
BenchmarkThroughput/MaxPacket/32MB-96                  1        2713806130 ns/op   12.36 MB/s
BenchmarkThroughput/MaxPacket/64MB-96                  1        5402023727 ns/op   12.42 MB/s
BenchmarkThroughput/DynamicPacket/1MB-96              10         128462369 ns/op    8.16 MB/s
BenchmarkThroughput/DynamicPacket/2MB-96               5         211779553 ns/op    9.90 MB/s
BenchmarkThroughput/DynamicPacket/4MB-96               3         378591737 ns/op   11.08 MB/s
BenchmarkThroughput/DynamicPacket/8MB-96               2         711548140 ns/op   11.79 MB/s
BenchmarkThroughput/DynamicPacket/16MB-96              1        1385720232 ns/op   12.11 MB/s
BenchmarkThroughput/DynamicPacket/32MB-96              1        2711156682 ns/op   12.38 MB/s
BenchmarkThroughput/DynamicPacket/64MB-96              1        5378659024 ns/op   12.48 MB/s
PASS
ok      crypto/tls      36.894s