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Add support for TCP_QUICKACK (#11369)

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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
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Harshavardhana 2021-02-02 09:44:18 -08:00 committed by GitHub
parent fe3aca70c3
commit c885777ac6
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1 changed files with 9 additions and 0 deletions
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9
cmd/http/dial_linux.go
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@ -38,6 +38,10 @@ func setInternalTCPParameters(c syscall.RawConn) error {
// since Linux 4.11. // since Linux 4.11.
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_FASTOPEN_CONNECT, 1) _ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_FASTOPEN_CONNECT, 1)
// Enable TCP quick ACK, John Nagle says
// "Set TCP_QUICKACK. If you find a case where that makes things worse, let me know."
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_QUICKACK, 1)
// The time (in seconds) the connection needs to remain idle before // The time (in seconds) the connection needs to remain idle before
// TCP starts sending keepalive probes, set this to 5 secs // TCP starts sending keepalive probes, set this to 5 secs
// system defaults to 7200 secs!!! // system defaults to 7200 secs!!!
@ -52,6 +56,7 @@ func setInternalTCPParameters(c syscall.RawConn) error {
// ~ cat /proc/sys/net/ipv4/tcp_keepalive_intvl (defaults to 75 secs, we reduce it to 3 secs) // ~ cat /proc/sys/net/ipv4/tcp_keepalive_intvl (defaults to 75 secs, we reduce it to 3 secs)
// 75 // 75
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, 3) _ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, 3)
}) })
} }
@ -86,6 +91,10 @@ func NewCustomDialContext(dialTimeout time.Duration) DialContext {
// the TCP fast open connect. This feature is supported // the TCP fast open connect. This feature is supported
// since Linux 4.11. // since Linux 4.11.
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_FASTOPEN_CONNECT, 1) _ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_FASTOPEN_CONNECT, 1)
// Enable TCP quick ACK, John Nagle says
// "Set TCP_QUICKACK. If you find a case where that makes things worse, let me know."
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_QUICKACK, 1)
}) })
}, },
} }