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tailscale/net/tstun
Jordan Whited f0230ce0b5
go.mod,net/tstun,wgengine/netstack: implement gVisor TCP GRO for Linux (#12921)
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 57856fc without TCP GRO.

Starting Test: protocol: TCP, 1 streams, 131072 byte blocks
- - - - - - - - - - - - - - - - - - - - - - - - -
Test Complete. Summary Results:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  4.77 GBytes  4.10 Gbits/sec   20 sender
[  5]   0.00-10.00  sec  4.77 GBytes  4.10 Gbits/sec      receiver

The second result is from this commit with TCP GRO.

Starting Test: protocol: TCP, 1 streams, 131072 byte blocks
- - - - - - - - - - - - - - - - - - - - - - - - -
Test Complete. Summary Results:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  10.6 GBytes  9.14 Gbits/sec   20 sender
[  5]   0.00-10.00  sec  10.6 GBytes  9.14 Gbits/sec      receiver

Updates #6816

Signed-off-by: Jordan Whited <jordan@tailscale.com>
4 months ago
..
fake.go cmd/tailscaled,net/tstun: fix data race on start-up in TUN mode 1 year ago
ifstatus_noop.go all: update copyright and license headers 2 years ago
ifstatus_windows.go all: update copyright and license headers 2 years ago
linkattrs_linux.go all: update copyright and license headers 2 years ago
linkattrs_notlinux.go all: update copyright and license headers 2 years ago
mtu.go disco,net/tstun,wgengine/magicsock: probe peer MTU 1 year ago
mtu_test.go disco,net/tstun,wgengine/magicsock: probe peer MTU 1 year ago
tap_linux.go go.mod,*: bump gvisor 1 year ago
tap_unsupported.go all: update copyright and license headers 2 years ago
tstun_stub.go cmd/tailscaled, net/tstun: build for aix/ppc64 8 months ago
tun.go net/tstun: implement env var for disabling UDP GRO on Linux (#11924) 7 months ago
tun_features_linux.go net/tstun: implement env var for disabling UDP GRO on Linux (#11924) 7 months ago
tun_features_notlinux.go net/tstun: implement env var for disabling UDP GRO on Linux (#11924) 7 months ago
tun_linux.go all: update copyright and license headers 2 years ago
tun_macos.go all: update copyright and license headers 2 years ago
tun_notwindows.go all: update copyright and license headers 2 years ago
tun_windows.go all: update copyright and license headers 2 years ago
wrap.go go.mod,net/tstun,wgengine/netstack: implement gVisor TCP GRO for Linux (#12921) 4 months ago
wrap_test.go wgengine/filter: support FilterRules matching on srcIP node caps [capver 100] 5 months ago