mirror of https://github.com/golang/go.git
89b26760d7
This CL adds minimal support of Happy Eyeballs-like TCP connection setup to Dialer API. Happy Eyeballs and derivation techniques are described in the following: - Happy Eyeballs: Success with Dual-Stack Hosts http://tools.ietf.org/html/rfc6555 - Analysing Dual Stack Behaviour and IPv6 Quality http://www.potaroo.net/presentations/2012-04-17-dual-stack-quality.pdf Usually, the techniques consist of three components below. - DNS query racers, that run A and AAAA queries in parallel or series - A short list of destination addresses - TCP SYN racers, that run IPv4 and IPv6 transport in parallel or series This CL implements only the latter two. The existing DNS query component gathers together A and AAAA records in series, so we don't touch it here. This CL just uses extended resolveInternetAddr and makes it possible to run multiple Dial racers in parallel. For example, when the given destination is a DNS name and the name has multiple address family A and AAAA records, and it happens on the TCP wildcard network "tcp" with DualStack=true like the following: (&net.Dialer{DualStack: true}).Dial("tcp", "www.example.com:80") The function will return a first established connection either TCP over IPv4 or TCP over IPv6, and close the other connection internally. Fixes #3610. Fixes #5267. Benchmark results on freebsd/amd64 virtual machine, tip vs. tip+12416043: benchmark old ns/op new ns/op delta BenchmarkTCP4OneShot 50696 52141 +2.85% BenchmarkTCP4OneShotTimeout 65775 66426 +0.99% BenchmarkTCP4Persistent 10986 10457 -4.82% BenchmarkTCP4PersistentTimeout 11207 10445 -6.80% BenchmarkTCP6OneShot 62009 63718 +2.76% BenchmarkTCP6OneShotTimeout 78351 79138 +1.00% BenchmarkTCP6Persistent 14695 14659 -0.24% BenchmarkTCP6PersistentTimeout 15032 14646 -2.57% BenchmarkTCP4ConcurrentReadWrite 7215 6217 -13.83% BenchmarkTCP6ConcurrentReadWrite 7528 7493 -0.46% benchmark old allocs new allocs delta BenchmarkTCP4OneShot 36 36 0.00% BenchmarkTCP4OneShotTimeout 36 36 0.00% BenchmarkTCP4Persistent 0 0 n/a% BenchmarkTCP4PersistentTimeout 0 0 n/a% BenchmarkTCP6OneShot 37 37 0.00% BenchmarkTCP6OneShotTimeout 37 37 0.00% BenchmarkTCP6Persistent 0 0 n/a% BenchmarkTCP6PersistentTimeout 0 0 n/a% BenchmarkTCP4ConcurrentReadWrite 0 0 n/a% BenchmarkTCP6ConcurrentReadWrite 0 0 n/a% benchmark old bytes new bytes delta BenchmarkTCP4OneShot 2500 2503 0.12% BenchmarkTCP4OneShotTimeout 2508 2505 -0.12% BenchmarkTCP4Persistent 0 0 n/a% BenchmarkTCP4PersistentTimeout 0 0 n/a% BenchmarkTCP6OneShot 2713 2707 -0.22% BenchmarkTCP6OneShotTimeout 2722 2720 -0.07% BenchmarkTCP6Persistent 0 0 n/a% BenchmarkTCP6PersistentTimeout 0 0 n/a% BenchmarkTCP4ConcurrentReadWrite 0 0 n/a% BenchmarkTCP6ConcurrentReadWrite 0 0 n/a% R=golang-dev, bradfitz, nightlyone, rsc CC=golang-dev https://golang.org/cl/12416043 |
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README
This is the source code repository for the Go programming language.
For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install.html in your web browser.
After installing Go, you can view a nicely formatted
doc/install.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install.html.
Unless otherwise noted, the Go source files are distributed
under the BSD-style license found in the LICENSE file.
--
Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set
the environment variable $GOROOT to the full path of the go
directory (the one containing this README). You can omit the
variable if you unpack it into /usr/local/go, or if you rebuild
from sources by running all.bash (see doc/install.html).
You should also add the Go binary directory $GOROOT/bin
to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might
put the following in your .profile:
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin
See doc/install.html for more details.