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tailscale/net/tstun
Jordan Whited 7bc2ddaedc
go.mod,net/tstun,wgengine/netstack: implement gVisor TCP GSO for Linux (#12869)
This commit implements TCP GSO for packets being read from gVisor on
Linux. Windows support will follow later. The wireguard-go dependency is
updated in order to make use of newly exported GSO logic from its tun
package.

A new gVisor stack.LinkEndpoint implementation has been established
(linkEndpoint) that is loosely modeled after its predecessor
(channel.Endpoint). This new implementation supports GSO of monster TCP
segments up to 64K in size, whereas channel.Endpoint only supports up to
32K. linkEndpoint will also be required for GRO, which will be
implemented in a follow-on commit.

TCP throughput from gVisor, i.e. TUN read direction, is dramatically
improved as a result of this commit. Benchmarks show substantial
improvement through a wide range of RTT and loss conditions, sometimes
as high as 5x.

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 GSO.

Starting Test: protocol: TCP, 1 streams, 131072 byte blocks
- - - - - - - - - - - - - - - - - - - - - - - - -
Test Complete. Summary Results:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  2.51 GBytes  2.15 Gbits/sec  154 sender
[  5]   0.00-10.00  sec  2.49 GBytes  2.14 Gbits/sec      receiver

The second result is from this commit with TCP GSO.

Starting Test: protocol: TCP, 1 streams, 131072 byte blocks
- - - - - - - - - - - - - - - - - - - - - - - - -
Test Complete. Summary Results:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  12.6 GBytes  10.8 Gbits/sec    6 sender
[  5]   0.00-10.00  sec  12.6 GBytes  10.8 Gbits/sec      receiver

Updates #6816

Signed-off-by: Jordan Whited <jordan@tailscale.com>
3 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 7 months ago
tun.go net/tstun: implement env var for disabling UDP GRO on Linux (#11924) 6 months ago
tun_features_linux.go net/tstun: implement env var for disabling UDP GRO on Linux (#11924) 6 months ago
tun_features_notlinux.go net/tstun: implement env var for disabling UDP GRO on Linux (#11924) 6 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 GSO for Linux (#12869) 3 months ago
wrap_test.go wgengine/filter: support FilterRules matching on srcIP node caps [capver 100] 5 months ago