You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

Go to file

Avery Pennarun a92b9647c5 wgengine/bench: speed test for channels, sockets, and wireguard-go. This tries to generate traffic at a rate that will saturate the receiver, without overdoing it, even in the event of packet loss. It's unrealistically more aggressive than TCP (which will back off quickly in case of packet loss) but less silly than a blind test that just generates packets as fast as it can (which can cause all the CPU to be absorbed by the transmitter, giving an incorrect impression of how much capacity the total system has). Initial indications are that a syscall about every 10 packets (TCP bulk delivery) is roughly the same speed as sending every packet through a channel. A syscall per packet is about 5x-10x slower than that. The whole tailscale wireguard-go + magicsock + packet filter combination is about 4x slower again, which is better than I thought we'd do, but probably has room for improvement. Note that in "full" tailscale, there is also a tundev read/write for every packet, effectively doubling the syscall overhead per packet. Given these numbers, it seems like read/write syscalls are only 25-40% of the total CPU time used in tailscale proper, so we do have significant non-syscall optimization work to do too. Sample output: $ GOMAXPROCS=2 go test -bench . -benchtime 5s ./cmd/tailbench goos: linux goarch: amd64 pkg: tailscale.com/cmd/tailbench cpu: Intel(R) Core(TM) i7-4785T CPU @ 2.20GHz BenchmarkTrivialNoAlloc/32-2 56340248 93.85 ns/op 340.98 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivialNoAlloc/124-2 57527490 99.27 ns/op 1249.10 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivialNoAlloc/1024-2 52537773 111.3 ns/op 9200.39 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivial/32-2 41878063 135.6 ns/op 236.04 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivial/124-2 41270439 138.4 ns/op 896.02 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivial/1024-2 36337252 154.3 ns/op 6635.30 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkBlockingChannel/32-2 12171654 494.3 ns/op 64.74 MB/s 0 %lost 1791 B/op 0 allocs/op BenchmarkBlockingChannel/124-2 12149956 507.8 ns/op 244.17 MB/s 0 %lost 1792 B/op 1 allocs/op BenchmarkBlockingChannel/1024-2 11034754 528.8 ns/op 1936.42 MB/s 0 %lost 1792 B/op 1 allocs/op BenchmarkNonlockingChannel/32-2 8960622 2195 ns/op 14.58 MB/s 8.825 %lost 1792 B/op 1 allocs/op BenchmarkNonlockingChannel/124-2 3014614 2224 ns/op 55.75 MB/s 11.18 %lost 1792 B/op 1 allocs/op BenchmarkNonlockingChannel/1024-2 3234915 1688 ns/op 606.53 MB/s 3.765 %lost 1792 B/op 1 allocs/op BenchmarkDoubleChannel/32-2 8457559 764.1 ns/op 41.88 MB/s 5.945 %lost 1792 B/op 1 allocs/op BenchmarkDoubleChannel/124-2 5497726 1030 ns/op 120.38 MB/s 12.14 %lost 1792 B/op 1 allocs/op BenchmarkDoubleChannel/1024-2 7985656 1360 ns/op 752.86 MB/s 13.57 %lost 1792 B/op 1 allocs/op BenchmarkUDP/32-2 1652134 3695 ns/op 8.66 MB/s 0 %lost 176 B/op 3 allocs/op BenchmarkUDP/124-2 1621024 3765 ns/op 32.94 MB/s 0 %lost 176 B/op 3 allocs/op BenchmarkUDP/1024-2 1553750 3825 ns/op 267.72 MB/s 0 %lost 176 B/op 3 allocs/op BenchmarkTCP/32-2 11056336 503.2 ns/op 63.60 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTCP/124-2 11074869 533.7 ns/op 232.32 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTCP/1024-2 8934968 671.4 ns/op 1525.20 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkWireGuardTest/32-2 1403702 4547 ns/op 7.04 MB/s 14.37 %lost 467 B/op 3 allocs/op BenchmarkWireGuardTest/124-2 780645 7927 ns/op 15.64 MB/s 1.537 %lost 420 B/op 3 allocs/op BenchmarkWireGuardTest/1024-2 512671 11791 ns/op 86.85 MB/s 0.5206 %lost 411 B/op 3 allocs/op PASS ok tailscale.com/wgengine/bench 195.724s Updates #414. Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>		3 years ago
.github	.github/workflows: add --race tests on Linux and Windows	3 years ago
atomicfile	atomicfile: don't Chmod on windows	4 years ago
client/tailscale	ipn/ipnlocal, etc: require file sharing capability to send/recv files	3 years ago
cmd	net/dns: don't use NM+resolved for NM >=1.26.6.	3 years ago
control/controlclient	control/controlclient: fix signRegisterRequest log suppression check on Windows	3 years ago
derp	derp/derpmap: add São Paulo (derp11)	3 years ago
disco	Added 2 fuzzers	3 years ago
health	health, wgenegine: fix receive func health checks yet again	3 years ago
internal	wgengine: move DNS configuration out of wgengine/router.	3 years ago
ipn	ipn/ipnlocal: add file sharing to windows shell	3 years ago
log	log/filelogger: move our Windows disk file writing+rotation package here	4 years ago
logpolicy	logpolicy: set log target on windows based on a registry key (#1542 )	3 years ago
logtail	logtail: reduce PublicID.UnmarshalText from 2 allocs to 0	3 years ago
metrics	metrics: add LabelMap.GetFloat	4 years ago
net	wgengine/bench: speed test for channels, sockets, and wireguard-go.	3 years ago
paths	ipn, paths, cmd/tailscaled: remove LegacyConfigPath, relaynode migration	3 years ago
portlist	portlist: de-dup services on same (proto, port) on both IPv4/IPv6	3 years ago
safesocket	safesocket: remove/update some old TODOs	3 years ago
scripts	Allow 2021 in LICENSE header.	3 years ago
smallzstd	smallzstd: new package that constructs zstd small encoders/decoders.	4 years ago
syncs	syncs: disable TestWatchMultipleValues on Windows CI builds	3 years ago
tailcfg	control/controlclient, tailcfg: add Debug.SleepSeconds (mapver 19)	3 years ago
tempfork	tempfork/wireguard-windows/firewall: add.	3 years ago
tsconst	net/netns: add windows support.	4 years ago
tstest	tstest/natlab: use net.ErrClosed	3 years ago
tstime	tstime: add RandomDurationBetween helper	3 years ago
tsweb	tsweb: add num_goroutines expvar	3 years ago
types	types/netmap: remove some old TODOs	3 years ago
util	util/cmpver: move into OSS from corp repo.	3 years ago
version	version: simplify iOS detection now that we require Go 1.16	3 years ago
wgengine	wgengine/bench: speed test for channels, sockets, and wireguard-go.	3 years ago
.gitattributes	.gitattributes: add a smudge filter for go.mod.	4 years ago
.gitignore	Revert "cmd/tailscaled: split package main into main shim + package"	3 years ago
AUTHORS	Move Linux client & common packages into a public repo.	4 years ago
CODE_OF_CONDUCT.md	Add a code of conduct.	4 years ago
Dockerfile	build_docker.sh, Dockerfile: fix bug with shell quoting	3 years ago
LICENSE	LICENSE: Reformat for Github	3 years ago
Makefile	wgengine/netstack: fix 32-bit build broken from prior commit	3 years ago
PATENTS	Move Linux client & common packages into a public repo.	4 years ago
README.md	Switch to Go 1.16.	3 years ago
SECURITY.md	Add a SECURITY.md for vulnerability reports.	4 years ago
VERSION.txt	VERSION.txt: this is 1.7.0.	3 years ago
api.md	api.md: clarify response behaviour for ACL POST endpoint	3 years ago
build_dist.sh	build_dist: fix after version refactor.	4 years ago
build_docker.sh	build_docker.sh, Dockerfile: fix bug with shell quoting	3 years ago
go.mod	go.mod: upgrade to latest wireguard-go	3 years ago
go.sum	go.mod: upgrade to latest wireguard-go	3 years ago
shell.nix	add nix-shell boilerplate (#1028 )	3 years ago

README.md

Tailscale

https://tailscale.com

Private WireGuard® networks made easy

Overview

This repository contains all the open source Tailscale client code and the tailscaled daemon and tailscale CLI tool. The tailscaled daemon runs primarily on Linux; it also works to varying degrees on FreeBSD, OpenBSD, Darwin, and Windows.

The Android app is at https://github.com/tailscale/tailscale-android

Using

We serve packages for a variety of distros at https://pkgs.tailscale.com .

Other clients

The macOS, iOS, and Windows clients use the code in this repository but additionally include small GUI wrappers that are not open source.

Building

go install tailscale.com/cmd/tailscale{,d}

If you're packaging Tailscale for distribution, use build_dist.sh instead, to burn commit IDs and version info into the binaries:

./build_dist.sh tailscale.com/cmd/tailscale
./build_dist.sh tailscale.com/cmd/tailscaled

If your distro has conventions that preclude the use of build_dist.sh, please do the equivalent of what it does in your distro's way, so that bug reports contain useful version information.

We only guarantee to support the latest Go release and any Go beta or release candidate builds (currently Go 1.16) in module mode. It might work in earlier Go versions or in GOPATH mode, but we're making no effort to keep those working.

Bugs

Please file any issues about this code or the hosted service on the issue tracker.

Contributing

PRs welcome! But please file bugs. Commit messages should reference bugs.

We require Developer Certificate of Origin Signed-off-by lines in commits.

About Us

Tailscale is primarily developed by the people at https://github.com/orgs/tailscale/people. For other contributors, see:

Legal

WireGuard is a registered trademark of Jason A. Donenfeld.