[PR #6775] [client,relay] Reduce per-packet overhead on the relay data path #26992

New Issue

saavagebueno · 2026-08-05T07:08:04-04:00

saavagebueno commented

2026-08-05 07:08:04 -04:00

📋 Pull Request Information

Original PR: https://github.com/netbirdio/netbird/pull/6775
Author: @Silex
Created: 7/15/2026
Status: 🔄 Open

Base: main ← Head: relay-datapath-perf

📝 Commits (10+)

a318cf1 [client] Size relay data-path socket buffers for throughput
b7211ae [client] Apply bounded backpressure before dropping inbound relayed messages
823ee82 [client] Size relay conn inbound channel for the path bandwidth-delay product
e15cc5b [client] Expose relay inbound message drops in RelayConnState
674cab0 [relay] Add relay_transport_queue_drops_total metric
598a7e9 [relay] Route relayed messages through a per-peer write queue
b7b7517 [relay] Add peer forwarding unit tests
bfb34e2 [relay] Add a benchmark harness for the relayed data path
af0c9a7 [relay] Add ReadBatch to the relay client connection
2af24fc [client] Batch WireGuard inject syscalls via sendmmsg

📊 Changes

19 files changed (+1772 additions, -45 deletions)

View changed files

📝 client/iface/wgproxy/ebpf/proxy.go (+89 -1)
📝 client/iface/wgproxy/ebpf/wrapper.go (+131 -0)
📝 client/iface/wgproxy/udp/proxy.go (+62 -0)
➕ client/net/sockbuffer.go (+68 -0)
➕ client/net/sockbuffer_linux.go (+73 -0)
➕ client/net/sockbuffer_linux_test.go (+73 -0)
➕ client/net/sockbuffer_others.go (+13 -0)
➕ client/net/sockbuffer_test.go (+78 -0)
📝 relay/metrics/realy.go (+32 -17)
📝 relay/server/peer.go (+112 -17)
➕ relay/server/peer_test.go (+286 -0)
➕ shared/relay/client/bench_pipe_test.go (+332 -0)
📝 shared/relay/client/client.go (+96 -9)
📝 shared/relay/client/conn.go (+46 -0)
➕ shared/relay/client/conn_container_test.go (+259 -0)
📝 shared/relay/client/dialer/capability.go (+10 -0)
📝 shared/relay/client/dialer/quic/conn.go (+4 -0)
📝 shared/relay/client/dialer/quic/quic.go (+4 -0)
📝 shared/relay/client/manager.go (+4 -1)

📄 Description

Describe your changes

Second slice of the relay-throughput work from #6021 (first slice: #6774). Everything in this PR is wire-compatible — no protocol change, an old client and a new relay (or vice versa) interoperate unchanged.

Four independent layers, bottom of the stack first:

1. Client: bounded backpressure on the inbound relay path. Instead of dropping a relayed message the moment the per-peer channel is full, the reader applies bounded backpressure before giving up, and the channel is sized for the path's bandwidth-delay product rather than a fixed small constant. Drops that do happen are now visible: RelayConnState exposes an InboundMsgDrops counter instead of losing packets silently.

2. Relay server: per-peer write queue. Forwarding used to write synchronously into the destination peer's connection, so one slow receiver could stall the shared forwarding path. Writes now go through a bounded per-peer queue with a drop counter exported as relay_transport_queue_drops_total on the metrics endpoint. Unit tests included.

3. Batch I/O on the data path (opt-in). Three syscall-batching levers, each gated by an env var and off by default:

NB_RELAY_BATCH_READ — drain the local WG proxy socket with recvmmsg instead of one read per packet,
NB_RELAY_INJECT_BATCH — inject received packets into WireGuard with sendmmsg,
plus a ReadBatch on the relay client connection feeding the inject path.

4. A benchmark harness (TestPipe... in shared/relay/client) that exercises the full client→relay→client data path in-process, so data-path changes can be measured without a lab setup.

Measured effect on the same pair as #6774 (two 1 Gbit Linux hosts, ~5 ms RTT via a dedicated relay, single iperf3 flow, cubic, stock sysctls, receiver-side Mbit/s), with the batch gates enabled and the WebSocket transport (NB_RELAY_TRANSPORT=ws):

	up	down
#6774 alone	180	150
+ this PR	227	184

(Stock 0.74.2 baseline was 97.6/96.5.) A side observation from the same runs: once buffers are sized, the WS transport consistently outperformed QUIC on this path (227 vs 183 up) — QUIC datagram queues drop silently under bursts.

The batch gates ship off exactly as they were tested; happy to flip any of them default-on if that's the direction you prefer after your own validation.

Stacked on #6774 — the first commit here is that PR's commit; review the rest.

Issue ticket number and link

#6021

Stack

Checklist

Is it a bug fix
Is a typo/documentation fix
Is a feature enhancement
It is a refactor
Created tests that fail without the change (if possible)
This change does not modify the public API, gRPC protocols, functionality behavior, CLI / service flags, or introduce a new feature — OR I have discussed it with the NetBird team beforehand (link the issue / Slack thread in the description). See CONTRIBUTING.md. — discussion anchor: #6021

By submitting this pull request, you confirm that you have read and agree to the terms of the Contributor License Agreement.

Documentation

Select exactly one:

I added/updated documentation for this change
Documentation is not needed for this change (explain why)

The default-on parts (backpressure, write queue, metric) need no operator action; the batch env vars are advanced opt-in tuning knobs, consistent with other undocumented NB_* tunables. Can add docs for the metric name if desired.

Summary by CodeRabbit

New Features
- Added optional packet batching to improve relay throughput and reduce processing overhead.
- Added configurable UDP socket buffer sizing, including an option to disable it.
- Added inbound message drop reporting and transport queue drop metrics.
Bug Fixes
- Improved backpressure handling so slow destinations no longer block message intake.
- Added bounded queues and safer cleanup to prevent stalls during congestion or connection closure.
Performance
- Improved bidirectional relay performance with batched reads and writes.
- Added support for detecting datagram-capable connections.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/netbirdio/netbird/pull/6775 **Author:** [@Silex](https://github.com/Silex) **Created:** 7/15/2026 **Status:** 🔄 Open **Base:** `main` ← **Head:** `relay-datapath-perf` --- ### 📝 Commits (10+) - [`a318cf1`](https://github.com/netbirdio/netbird/commit/a318cf1519d81900fa815fa967656f665cf6543a) [client] Size relay data-path socket buffers for throughput - [`b7211ae`](https://github.com/netbirdio/netbird/commit/b7211ae7e6be7323fcb3d5f57a43dc225f25d299) [client] Apply bounded backpressure before dropping inbound relayed messages - [`823ee82`](https://github.com/netbirdio/netbird/commit/823ee82f5451e3edacbea9a41b991b7784ff3e87) [client] Size relay conn inbound channel for the path bandwidth-delay product - [`e15cc5b`](https://github.com/netbirdio/netbird/commit/e15cc5b8a98469d561c3c3a409fa5472044cd0e4) [client] Expose relay inbound message drops in RelayConnState - [`674cab0`](https://github.com/netbirdio/netbird/commit/674cab0d6baa5109bf57969c863eb59d8dd80d8d) [relay] Add relay_transport_queue_drops_total metric - [`598a7e9`](https://github.com/netbirdio/netbird/commit/598a7e96b01245100ff65b7ec035c0f76a333877) [relay] Route relayed messages through a per-peer write queue - [`b7b7517`](https://github.com/netbirdio/netbird/commit/b7b7517665958e76b69f0d31606a6025da08cb97) [relay] Add peer forwarding unit tests - [`bfb34e2`](https://github.com/netbirdio/netbird/commit/bfb34e214d2751ccd97f3b5c98af1f07c2fae8a1) [relay] Add a benchmark harness for the relayed data path - [`af0c9a7`](https://github.com/netbirdio/netbird/commit/af0c9a767b2c88bd8b675009d1384df8405c9dca) [relay] Add ReadBatch to the relay client connection - [`2af24fc`](https://github.com/netbirdio/netbird/commit/2af24fce7186d5e4c9f16688907eba922d700846) [client] Batch WireGuard inject syscalls via sendmmsg ### 📊 Changes **19 files changed** (+1772 additions, -45 deletions) <details> <summary>View changed files</summary> 📝 `client/iface/wgproxy/ebpf/proxy.go` (+89 -1) 📝 `client/iface/wgproxy/ebpf/wrapper.go` (+131 -0) 📝 `client/iface/wgproxy/udp/proxy.go` (+62 -0) ➕ `client/net/sockbuffer.go` (+68 -0) ➕ `client/net/sockbuffer_linux.go` (+73 -0) ➕ `client/net/sockbuffer_linux_test.go` (+73 -0) ➕ `client/net/sockbuffer_others.go` (+13 -0) ➕ `client/net/sockbuffer_test.go` (+78 -0) 📝 `relay/metrics/realy.go` (+32 -17) 📝 `relay/server/peer.go` (+112 -17) ➕ `relay/server/peer_test.go` (+286 -0) ➕ `shared/relay/client/bench_pipe_test.go` (+332 -0) 📝 `shared/relay/client/client.go` (+96 -9) 📝 `shared/relay/client/conn.go` (+46 -0) ➕ `shared/relay/client/conn_container_test.go` (+259 -0) 📝 `shared/relay/client/dialer/capability.go` (+10 -0) 📝 `shared/relay/client/dialer/quic/conn.go` (+4 -0) 📝 `shared/relay/client/dialer/quic/quic.go` (+4 -0) 📝 `shared/relay/client/manager.go` (+4 -1) </details> ### 📄 Description ## Describe your changes Second slice of the relay-throughput work from #6021 (first slice: #6774). Everything in this PR is **wire-compatible** — no protocol change, an old client and a new relay (or vice versa) interoperate unchanged. Four independent layers, bottom of the stack first: **1. Client: bounded backpressure on the inbound relay path.** Instead of dropping a relayed message the moment the per-peer channel is full, the reader applies bounded backpressure before giving up, and the channel is sized for the path's bandwidth-delay product rather than a fixed small constant. Drops that do happen are now visible: `RelayConnState` exposes an `InboundMsgDrops` counter instead of losing packets silently. **2. Relay server: per-peer write queue.** Forwarding used to write synchronously into the destination peer's connection, so one slow receiver could stall the shared forwarding path. Writes now go through a bounded per-peer queue with a drop counter exported as `relay_transport_queue_drops_total` on the metrics endpoint. Unit tests included. **3. Batch I/O on the data path (opt-in).** Three syscall-batching levers, each gated by an env var and **off by default**: - `NB_RELAY_BATCH_READ` — drain the local WG proxy socket with `recvmmsg` instead of one read per packet, - `NB_RELAY_INJECT_BATCH` — inject received packets into WireGuard with `sendmmsg`, - plus a `ReadBatch` on the relay client connection feeding the inject path. **4. A benchmark harness** (`TestPipe...` in `shared/relay/client`) that exercises the full client→relay→client data path in-process, so data-path changes can be measured without a lab setup. Measured effect on the same pair as #6774 (two 1 Gbit Linux hosts, ~5 ms RTT via a dedicated relay, single iperf3 flow, cubic, stock sysctls, receiver-side Mbit/s), with the batch gates enabled and the WebSocket transport (`NB_RELAY_TRANSPORT=ws`): | | up | down | |---|---|---| | #6774 alone | 180 | 150 | | + this PR | 227 | 184 | (Stock 0.74.2 baseline was 97.6/96.5.) A side observation from the same runs: once buffers are sized, the WS transport consistently outperformed QUIC on this path (227 vs 183 up) — QUIC datagram queues drop silently under bursts. The batch gates ship off exactly as they were tested; happy to flip any of them default-on if that's the direction you prefer after your own validation. Stacked on #6774 — the first commit here is that PR's commit; review the rest. ## Issue ticket number and link #6021 ## Stack  ### Checklist - [ ] Is it a bug fix - [ ] Is a typo/documentation fix - [x] Is a feature enhancement - [ ] It is a refactor - [x] Created tests that fail without the change (if possible) - [x] This change does **not** modify the public API, gRPC protocols, functionality behavior, CLI / service flags, or introduce a new feature — **OR** I have discussed it with the NetBird team beforehand (link the issue / Slack thread in the description). See [CONTRIBUTING.md](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTING.md#discuss-changes-with-the-netbird-team-first). — discussion anchor: #6021 > By submitting this pull request, you confirm that you have read and agree to the terms of the [Contributor License Agreement](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT.md). ## Documentation Select exactly one: - [ ] I added/updated documentation for this change - [x] Documentation is **not needed** for this change (explain why) The default-on parts (backpressure, write queue, metric) need no operator action; the batch env vars are advanced opt-in tuning knobs, consistent with other undocumented `NB_*` tunables. Can add docs for the metric name if desired.  ## Summary by CodeRabbit * **New Features** * Added optional packet batching to improve relay throughput and reduce processing overhead. * Added configurable UDP socket buffer sizing, including an option to disable it. * Added inbound message drop reporting and transport queue drop metrics. * **Bug Fixes** * Improved backpressure handling so slow destinations no longer block message intake. * Added bounded queues and safer cleanup to prevent stalls during congestion or connection closure. * **Performance** * Improved bidirectional relay performance with batched reads and writes. * Added support for detecting datagram-capable connections.  --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

saavagebueno added the pull-request label 2026-08-05 07:08:04 -04:00

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traffic-correlation-policy

feature/rest-client-options

feat/events-metrics

feature/buf-cli

test/add-ratelimiter

test/remove-write-lock-on-add-peer

fix/add-peer-semaphore

feature/users-roles-endpoint

mlsmaycon-patch-1

debug-user-role

chore/primary-key-on-networks

feature/update-account-peers-buffer-startup

remove-ubuntu2004-runners

refactor/permissions-no-pat-allowed

ref/logrus-factory

use-conntrack-zone

deploy/permissions-account

feature/lazy-connection-idle

ref/improve-test-cov

restore-pr-3440

test/increase-grpc-timeouts

feat/buffer-account-peers-update

test/networkmapgeneration-changes

feature/base-manager

feature/flow-receiver

chore/benchmark-with-large-runner

refactor/handshake-initiator

client/ui-update-systray-icons

userspace-router

wgwatcher-test

output-if-key-already-exists

fix/relay-reconnection

feature/port-forwarding-client-codecleaning

detached2

test/callbacks-nil-iceconninfo

refactor/optimize-peer-expiration

enable-udp-port-for-docker-template

fix/relay-update

feature/apply-posture-netmap

fix/group-update-existing-resource

conntrack-stats

upgrade-okta-sdk

multi-price

test/conn-stat

set-min-parallel-tests-for-management

dns-interceptor

debug-dns

router-dns

add-static-system-info

debug-0.29.4

debug-0.33.0

account-refactoring

relay/2800_quic

route-get-account-refactoring

test/seed-random-routes

feature/get-account-refactoring

test/reconnect-race-condition

refactor/get-account-usage

feature/add-session-id-to-update-channel

improve-ipv4conn

fix/async-pion-event-handling

debug

add-offload

feature/validate-group-association-debug

fix/limit-conn-for-sqlite

test/engine-iface

test/transaction-for-jwt-sync

fix/engine-stop-in-foreground

feature/add-mysql-support

test-migration

refactor/header-size-values

relay/eliminate-gob

test/signal-dispatcher-with-relay

relay/debug

validate-icon

feature/ipv6-support

use-pre-expanded-peers-map

feature/use-signal-dispatcher

validate/peer-status

add-read-write-times

fix/sync-peer-race

feature/relay-status

netmap

evaluate/network-map-hash

fix/lower-dns-resolve-interval-on-fail

feature/relay

fix/go-mod-version

upgrade-nftables

synology-userspace-mode

fix/use-ip-for-default-routes-on-darwin

fix/proxy_close

enable-release-workflow-on-pr

deploy/peer-performance

feature/permanent-turn

feature/permanent-turn-proxy

deploy/posture-check-sqlite

feature/optimize_sqlite_save

debug-ios-behavior

fix/delete-route-only-after-adding

tshoot/windows-logger

remove-new-routing

refactor/eliminate-repo-dependency

add-arm-to-ci

refactor-demo-account-object

test/abc2

test/abc

send-ssh-rosenpass-config-meta

refactor-demo

ensure-schedule-never-runs-non-positive

feature/peer-validator-groupmgm

feature/peer-validator-fix

fix/include-active-dashboard-users

fix/handle-canceling-schedule

fix/geo-download

debug-google-workspace

yury/resolve-ip-to-location

feature/extend-sysinfo

sqlite-async-peer-status

yury/add-postgresql-store

fix/route

test-build

posture-checks-poc

debug-keycloak-idp

poc/netstack

for-pascal-tmp

peer-logout-management

manual-peer-logout

detached

chore/refactor-management

test/dns-bind

fix/enforce-acl-for-containers

yury/use-sync-map-in-updatechannel

fix/events-key-handling

filter-cache-on-load-account

fix/user-expiration

handle-user-context-cancellation

nb-client-k8s-statefulset

fake-addr

fix/iptables_in_docker

ebpf-debug

update-getting-started-flow-use-postgres

fix/peer_list_notification

feature/device-authentication-with-client-secret

feature/keep_alive

feat-groups-from-jwt

separate_proxy_from_wgconfig

fix/wg_conn

wg_conn_fix

wg_bind_parallel_processing

fix-rollback-get-acls

proxy_cfg_cleanup

performance-improvement-rego

update-lock-log-level

feat-client-side-acl

refactor/move_grpcserver_logic_to_account_manager

feature/event-storage

feature/update-idp-redeeming-invite

feature/api-peer-info

return-groupminimum-setupkey

feature/interface-bind

documentation_enhancement

fix-peer-registration

ssh

users_cache

pass-client-caller

client_caller_type

revert-283-feat-fix-windows-installer

periodic-peer-updates

ebpf

braginini/wasm

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Reference: DYNR/netbird#26992