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wgengine/netstack: enable TCP SACK (#6066)

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TCP selective acknowledgement can improve throughput by an order
of magnitude in the presence of loss.

Signed-off-by: Jordan Whited <jordan@tailscale.com>
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Jordan Whited 2022-10-25 16:09:20 -07:00 committed by GitHub
parent d60f7fe33f
commit a471681e28
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1 changed files with 5 additions and 0 deletions
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5
wgengine/netstack/netstack.go
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@ -160,6 +160,11 @@ func Create(logf logger.Logf, tundev *tstun.Wrapper, e wgengine.Engine, mc *magi
NetworkProtocols: []stack.NetworkProtocolFactory{ipv4.NewProtocol, ipv6.NewProtocol}, NetworkProtocols: []stack.NetworkProtocolFactory{ipv4.NewProtocol, ipv6.NewProtocol},
TransportProtocols: []stack.TransportProtocolFactory{tcp.NewProtocol, udp.NewProtocol, icmp.NewProtocol4, icmp.NewProtocol6}, TransportProtocols: []stack.TransportProtocolFactory{tcp.NewProtocol, udp.NewProtocol, icmp.NewProtocol4, icmp.NewProtocol6},
}) })
sackEnabledOpt := tcpip.TCPSACKEnabled(true) // TCP SACK is disabled by default
tcpipErr := ipstack.SetTransportProtocolOption(tcp.ProtocolNumber, &sackEnabledOpt)
if tcpipErr != nil {
return nil, fmt.Errorf("could not enable TCP SACK: %v", tcpipErr)
}
linkEP := channel.New(512, mtu, "") linkEP := channel.New(512, mtu, "")
if tcpipProblem := ipstack.CreateNIC(nicID, linkEP); tcpipProblem != nil { if tcpipProblem := ipstack.CreateNIC(nicID, linkEP); tcpipProblem != nil {
return nil, fmt.Errorf("could not create netstack NIC: %v", tcpipProblem) return nil, fmt.Errorf("could not create netstack NIC: %v", tcpipProblem)