tun/netstack: enable TCP Selective Acknowledgements
Enable TCP SACK for the gVisor Stack used in tun/netstack. This can improve throughput by an order of magnitude in the presence of packet loss. Reviewed-by: James Tucker <james@tailscale.com> Signed-off-by: Jordan Whited <jordan@tailscale.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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@ -65,8 +65,13 @@ func CreateNetTUN(localAddresses, dnsServers []netip.Addr, mtu int) (tun.Device,
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dnsServers: dnsServers,
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mtu: mtu,
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}
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sackEnabledOpt := tcpip.TCPSACKEnabled(true) // TCP SACK is disabled by default
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tcpipErr := dev.stack.SetTransportProtocolOption(tcp.ProtocolNumber, &sackEnabledOpt)
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if tcpipErr != nil {
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return nil, nil, fmt.Errorf("could not enable TCP SACK: %v", tcpipErr)
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}
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dev.ep.AddNotify(dev)
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tcpipErr := dev.stack.CreateNIC(1, dev.ep)
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tcpipErr = dev.stack.CreateNIC(1, dev.ep)
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if tcpipErr != nil {
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return nil, nil, fmt.Errorf("CreateNIC: %v", tcpipErr)
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}
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