rework Results.tex to include gVisor findings

Listings/tailscale_netstack_overrides.go

@@ -0,0 +1,28 @@
+// values are biased towards higher throughput on high bandwidth-delay
+// product paths, except on memory-constrained platforms.
+tcpRXBufOpt := tcpip.TCPReceiveBufferSizeRangeOption{
+    ...
+    Max: tcpRXBufMaxSize,
+}
+tcpipErr := ipstack.SetTransportProtocolOption(tcp.ProtocolNumber, &tcpRXBufOpt)
+...
+tcpTXBufOpt := tcpip.TCPSendBufferSizeRangeOption{
+    ...
+    Max: tcpTXBufMaxSize,
+}
+tcpipErr = ipstack.SetTransportProtocolOption(tcp.ProtocolNumber, &tcpTXBufOpt)
+...
+sackEnabledOpt := tcpip.TCPSACKEnabled(true) // TCP SACK is disabled by default
+tcpipErr := ipstack.SetTransportProtocolOption(tcp.ProtocolNumber, &sackEnabledOpt)
+...
+// See https://github.com/tailscale/tailscale/issues/9707
+// gVisor's RACK performs poorly. ACKs do not appear to be handled in a
+// timely manner, leading to spurious retransmissions and a reduced
+// congestion window.
+tcpRecoveryOpt := tcpip.TCPRecovery(0)
+tcpipErr = ipstack.SetTransportProtocolOption(tcp.ProtocolNumber, &tcpRecoveryOpt)
+...
+// gVisor defaults to reno at the time of writing. We explicitly set reno
+// See https://github.com/google/gvisor/issues/11632
+renoOpt := tcpip.CongestionControlOption("reno")
+tcpipErr = ipstack.SetTransportProtocolOption(tcp.ProtocolNumber, &renoOpt)