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f0230ce0b5
This commit implements TCP GRO for packets being written to gVisor on
Linux. Windows support will follow later. The wireguard-go dependency is
updated in order to make use of newly exported IP checksum functions.
gVisor is updated in order to make use of newly exported
stack.PacketBuffer GRO logic.
TCP throughput towards gVisor, i.e. TUN write direction, is dramatically
improved as a result of this commit. Benchmarks show substantial
improvement, sometimes as high as 2x. High bandwidth-delay product
paths remain receive window limited, bottlenecked by gVisor's default
TCP receive socket buffer size. This will be addressed in a follow-on
commit.
The iperf3 results below demonstrate the effect of this commit between
two Linux computers with i5-12400 CPUs. There is roughly ~13us of round
trip latency between them.
The first result is from commit
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| .. | ||
| fake.go | ||
| ifstatus_noop.go | ||
| ifstatus_windows.go | ||
| linkattrs_linux.go | ||
| linkattrs_notlinux.go | ||
| mtu_test.go | ||
| mtu.go | ||
| tap_linux.go | ||
| tap_unsupported.go | ||
| tstun_stub.go | ||
| tun_features_linux.go | ||
| tun_features_notlinux.go | ||
| tun_linux.go | ||
| tun_macos.go | ||
| tun_notwindows.go | ||
| tun_windows.go | ||
| tun.go | ||
| wrap_test.go | ||
| wrap.go | ||