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Set tcp user timeout to clean sockets with data in the buffer (#16887)

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Anis Eleuch 2023-03-24 16:10:58 +01:00 committed by GitHub
parent 2d51e42305
commit c259a8ea38
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1 changed files with 18 additions and 0 deletions
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18
internal/http/dial_linux.go
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@ -51,6 +51,24 @@ func setTCPParameters(network, address string, c syscall.RawConn) error {
// 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
// TCP starts sending keepalive probes
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPIDLE, 15)
// Number of probes.
// ~ cat /proc/sys/net/ipv4/tcp_keepalive_probes (defaults to 9, we reduce it to 5)
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPCNT, 5)
// Wait time after successful probe in seconds.
// ~ cat /proc/sys/net/ipv4/tcp_keepalive_intvl (defaults to 75 secs, we reduce it to 15 secs)
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, 15)
// Set tcp user timeout in addition to the keep-alive - tcp-keepalive is not enough to close a socket
// with dead end because tcp-keepalive is not fired when there is data in the socket buffer.
// https://blog.cloudflare.com/when-tcp-sockets-refuse-to-die/
// This is a sensitive configuration, it is better to set it to high values, > 60 secs
_ = syscall.SetsockoptInt(fd, syscall.IPPROTO_TCP, unix.TCP_USER_TIMEOUT, (15+5*15)*1000)
})
return nil
}