2013-07-15 16:40:55 -06:00
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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2014-09-18 04:17:55 -06:00
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// +build darwin dragonfly freebsd linux netbsd openbsd solaris windows
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2013-07-15 16:40:55 -06:00
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package net
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import (
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"os"
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"syscall"
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)
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2013-07-27 20:18:06 -06:00
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func setNoDelay(fd *netFD, noDelay bool) error {
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net: add special netFD mutex
The mutex, fdMutex, handles locking and lifetime of sysfd,
and serializes Read and Write methods.
This allows to strip 2 sync.Mutex.Lock calls,
2 sync.Mutex.Unlock calls, 1 defer and some amount
of misc overhead from every network operation.
On linux/amd64, Intel E5-2690:
benchmark old ns/op new ns/op delta
BenchmarkTCP4Persistent 9595 9454 -1.47%
BenchmarkTCP4Persistent-2 8978 8772 -2.29%
BenchmarkTCP4ConcurrentReadWrite 4900 4625 -5.61%
BenchmarkTCP4ConcurrentReadWrite-2 2603 2500 -3.96%
In general it strips 70-500 ns from every network operation depending
on processor model. On my relatively new E5-2690 it accounts to ~5%
of network op cost.
Fixes #6074.
R=golang-dev, bradfitz, alex.brainman, iant, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/12418043
2013-08-09 11:43:00 -06:00
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if err := fd.incref(); err != nil {
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2013-07-15 16:40:55 -06:00
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return err
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}
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defer fd.decref()
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2013-07-27 20:18:06 -06:00
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return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_NODELAY, boolint(noDelay)))
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2013-07-15 16:40:55 -06:00
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}
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