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TCP_QUICKACK is a setting that allows TCP endpoints to acknowledge the receipt of data instantly in situations where they would normally wait to see if more data would be arriving. https://assets.extrahop.com/whitepapers/TCP-Optimization-Guide-by-ExtraHop.pdf
104 lines
3.6 KiB
Go
104 lines
3.6 KiB
Go
// +build linux
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/*
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* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package http
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import (
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"context"
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"net"
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"syscall"
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"time"
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"golang.org/x/sys/unix"
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)
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func setInternalTCPParameters(c syscall.RawConn) error {
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return c.Control(func(fdPtr uintptr) {
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// got socket file descriptor to set parameters.
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fd := int(fdPtr)
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// Enable TCP fast connect
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// TCPFastOpenConnect sets the underlying socket to use
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// the TCP fast open connect. This feature is supported
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// since Linux 4.11.
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_FASTOPEN_CONNECT, 1)
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// Enable TCP quick ACK, John Nagle says
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// "Set TCP_QUICKACK. If you find a case where that makes things worse, let me know."
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_QUICKACK, 1)
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// The time (in seconds) the connection needs to remain idle before
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// TCP starts sending keepalive probes, set this to 5 secs
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// system defaults to 7200 secs!!!
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPIDLE, 5)
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// Number of probes.
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// ~ cat /proc/sys/net/ipv4/tcp_keepalive_probes (defaults to 9, we reduce it to 5)
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// 9
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPCNT, 5)
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// Wait time after successful probe in seconds.
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// ~ cat /proc/sys/net/ipv4/tcp_keepalive_intvl (defaults to 75 secs, we reduce it to 3 secs)
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// 75
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, 3)
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})
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}
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// DialContext is a function to make custom Dial for internode communications
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type DialContext func(ctx context.Context, network, address string) (net.Conn, error)
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// NewInternodeDialContext setups a custom dialer for internode communication
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func NewInternodeDialContext(dialTimeout time.Duration) DialContext {
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return func(ctx context.Context, network, addr string) (net.Conn, error) {
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dialer := &net.Dialer{
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Timeout: dialTimeout,
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Control: func(network, address string, c syscall.RawConn) error {
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return setInternalTCPParameters(c)
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},
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}
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return dialer.DialContext(ctx, network, addr)
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}
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}
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// NewCustomDialContext setups a custom dialer for any external communication and proxies.
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func NewCustomDialContext(dialTimeout time.Duration) DialContext {
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return func(ctx context.Context, network, addr string) (net.Conn, error) {
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dialer := &net.Dialer{
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Timeout: dialTimeout,
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Control: func(network, address string, c syscall.RawConn) error {
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return c.Control(func(fdPtr uintptr) {
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// got socket file descriptor to set parameters.
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fd := int(fdPtr)
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// Enable TCP fast connect
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// TCPFastOpenConnect sets the underlying socket to use
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// the TCP fast open connect. This feature is supported
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// since Linux 4.11.
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_FASTOPEN_CONNECT, 1)
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// Enable TCP quick ACK, John Nagle says
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// "Set TCP_QUICKACK. If you find a case where that makes things worse, let me know."
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_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_QUICKACK, 1)
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})
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},
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}
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return dialer.DialContext(ctx, network, addr)
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}
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}
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