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go.mod,net/tstun,wgengine/netstack: implement gVisor TCP GRO for Linux (#12921)

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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>
This commit is contained in:
Jordan Whited
2024-08-02 10:41:10 -07:00
committed by GitHub
parent cc370314e7
commit f0230ce0b5
8 changed files with 307 additions and 48 deletions
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4
go.mod
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@@ -80,7 +80,7 @@ require (
github.com/tailscale/peercred v0.0.0-20240214030740-b535050b2aa4
github.com/tailscale/web-client-prebuilt v0.0.0-20240226180453-5db17b287bf1
github.com/tailscale/wf v0.0.0-20240214030419-6fbb0a674ee6
github.com/tailscale/wireguard-go v0.0.0-20240724015428-60eeedfd624b
github.com/tailscale/wireguard-go v0.0.0-20240731203015-71393c576b98
github.com/tailscale/xnet v0.0.0-20240729143630-8497ac4dab2e
github.com/tc-hib/winres v0.2.1
github.com/tcnksm/go-httpstat v0.2.0
@@ -104,7 +104,7 @@ require (
golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2
golang.zx2c4.com/wireguard/windows v0.5.3
gopkg.in/square/go-jose.v2 v2.6.0
gvisor.dev/gvisor v0.0.0-20240306221502-ee1e1f6070e3
gvisor.dev/gvisor v0.0.0-20240722211153-64c016c92987
honnef.co/go/tools v0.4.6
k8s.io/api v0.30.3
k8s.io/apimachinery v0.30.3