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ipn/{ipnlocal,localapi},net/netkernelconf,client/tailscale,cmd/containerboot: optionally enable UDP GRO forwarding for containers (#12410)

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Add a new TS_EXPERIMENTAL_ENABLE_FORWARDING_OPTIMIZATIONS env var
that can be set for tailscale/tailscale container running as
a subnet router or exit node to enable UDP GRO forwarding
for improved performance.
See https://tailscale.com/kb/1320/performance-best-practices#linux-optimizations-for-subnet-routers-and-exit-nodes
This is currently considered an experimental approach;
the configuration support is partially to allow further experimentation
with containerized environments to evaluate the performance
improvements.

Updates tailscale/tailscale#12295

Signed-off-by: Irbe Krumina <irbe@tailscale.com>
This commit is contained in:
Irbe Krumina
2024-06-10 19:19:03 +01:00
committed by GitHub
parent 6f2bae019f
commit bc53ebd4a0
6 changed files with 140 additions and 19 deletions
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21
client/tailscale/localclient.go
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@@ -699,6 +699,27 @@ func (lc *LocalClient) CheckUDPGROForwarding(ctx context.Context) error {
return nil
}
// SetUDPGROForwarding enables UDP GRO forwarding for the main interface of this
// node. This can be done to improve performance of tailnet nodes acting as exit
// nodes or subnet routers.
// See https://tailscale.com/kb/1320/performance-best-practices#linux-optimizations-for-subnet-routers-and-exit-nodes
func (lc *LocalClient) SetUDPGROForwarding(ctx context.Context) error {
body, err := lc.get200(ctx, "/localapi/v0/set-udp-gro-forwarding")
if err != nil {
return err
}
var jres struct {
Warning string
}
if err := json.Unmarshal(body, &jres); err != nil {
return fmt.Errorf("invalid JSON from set-udp-gro-forwarding: %w", err)
}
if jres.Warning != "" {
return errors.New(jres.Warning)
}
return nil
}
// CheckPrefs validates the provided preferences, without making any changes.
//
// The CLI uses this before a Start call to fail fast if the preferences won't