http2: increase default window sizes by mcollina · Pull Request #64623 · nodejs/node · GitHub

Increase the default HTTP/2 stream window from 64KB (65535) to 4MB
(4194304) and the default local connection window to 32MB (33554432).

The default 64KB window limits throughput on high-latency connections
to window_size / RTT. With a 250ms RTT, throughput is limited to
256KB/s. The new defaults improve throughput to 16MB/s (128Mbps)
for the stream window and 128MB/s (1Gbps) for the connection window.

Fixes #38426

Review requested:

@nodejs/http
@nodejs/http2
@nodejs/net
@nodejs/sqlite

There's a pre-existing issue that this exposes: you can't configure this in advance. You can only control the connection window with session.setLocalWindowSize once you have a session, but at that point this initial WINDOW_UPDATE has already been sent, and shrinking the window isn't effective as shown in the tests here (it just blocks further updates, it can't reduce what's already been sent). The stream window is configurable in advance (it's a SETTINGS parameter) but this connection window isn't.

That already existed implicitly but it was kind of OK when the initial window was small, but it's a real problem with a very large initial window I think, since there's basically no way to override this to make it any smaller again if you need to.

Can we add client & server options for this, so it can be configured before the first WINDOW_UPDATE is sent somehow?

Nit: would be nicer to extract this as a constant

Codecov Report

❌ Patch coverage is 55.55556% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.16%. Comparing base (c8e2a82) to head (f399373).
⚠️ Report is 90 commits behind head on main.

Files with missing lines	Patch %	Lines
src/stream_pipe.cc	0.00%	4 Missing and 1 partial ⚠️
src/stream_base.cc	0.00%	0 Missing and 2 partials ⚠️
src/node_http2.cc	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #64623      +/-   ##
==========================================
- Coverage   90.16%   90.16%   -0.01%     
==========================================
  Files         746      746              
  Lines      242760   242773      +13     
  Branches    45765    45766       +1     
==========================================
+ Hits       218875   218885      +10     
+ Misses      15375    15368       -7     
- Partials     8510     8520      +10

Files with missing lines	Coverage Δ
lib/internal/http2/core.js	95.07% <100.00%> (+0.01%)	⬆️
src/node_http2.h	92.26% <ø> (ø)
src/node_http2.cc	81.66% <0.00%> (-0.09%)	⬇️
src/stream_base.cc	79.74% <0.00%> (-0.30%)	⬇️
src/stream_pipe.cc	56.48% <0.00%> (-3.06%)	⬇️

... and 31 files with indirect coverage changes

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

Both addressed:

Extracted DEFAULT_SETTINGS_LOCAL_CONNECTION_WINDOW_SIZE = 33554432 as a named constant in src/node_http2.h and used it in src/node_http2.cc.
The pre-existing issue about not being able to configure the connection window in advance is noted — the initial WINDOW_UPDATE is sent at session creation before setLocalWindowSize can be called. This is a known limitation of the current API.

Wouldn't it be semver-major PRs that contain breaking changes and should be released in the next major version. ?

yes

The pre-existing issue about not being able to configure the connection window in advance is noted — the initial WINDOW_UPDATE is sent at session creation before setLocalWindowSize can be called. This is a known limitation of the current API.

I do think this would be useful, but doesn't need to block this - I'll open a separate PR.

CI failure seems related to the change here; test-http2-respond-with-file-connection-abort is failing across multiple systems and that isn't a known flake. Leaving a request changes to this gets fixed before landing.

Increase the default HTTP/2 stream window from 64KB (65535) to 4MB (4194304) and the default local connection window to 32MB (33554432). The default 64KB window limits throughput on high-latency connections to window_size / RTT. With a 250ms RTT, throughput is limited to 256KB/s. The new defaults improve throughput to 16MB/s (128Mbps) for the stream window and 128MB/s (1Gbps) for the connection window. Fixes: nodejs#38426 Signed-off-by: Matteo Collina <hello@matteocollina.com>

When a stream is destroyed while a synchronous write is in flight from StreamPipe::ProcessData, ReportWritesToJSStreamListener:: OnStreamAfterReqFinished can be called with a null stream_ or a null req_wrap, causing a null pointer dereference. This race becomes more likely with larger HTTP/2 windows (e.g., nodejs#38426) because more data is in flight during session teardown. Add early-return guards for both cases to prevent the crash. Refs: nodejs#38426 Refs: nodejs#56825 Signed-off-by: Matteo Collina <hello@matteocollina.com>

With the default window size increase, the server sends an additional WINDOW_UPDATE frame during session setup, increasing the frames received by the client from 7 to 8 on some platforms. Relax the assertion to check >= 7 instead of strict equality. Refs: nodejs#38426 Signed-off-by: Matteo Collina <hello@matteocollina.com>

When the writable sink is destroyed while there are still pending writes, WritableListener::OnStreamDestroy previously reset pending_writes_ to 0. This caused OnStreamAfterWrite to decrement the counter below 0, making the pending_writes_ == 0 completion check fail permanently — the oncomplete callback was never called, causing a timeout. Fix by: 1. Not resetting pending_writes_ in OnStreamDestroy — let OnStreamAfterWrite track completion naturally. 2. Using sink_destroyed_ flag in Unpipe to always remove the writable listener regardless of pending_writes_ count. 3. Using <= 0 (instead of == 0) when sink_destroyed_ is set, and guarding RemoveStreamListener against a null stream. This race became more likely with larger HTTP/2 windows (nodejs#38426) because more writes are in flight when session teardown begins. Refs: nodejs#38426 Refs: nodejs#56825 Signed-off-by: Matteo Collina <hello@matteocollina.com>

Signed-off-by: Matteo Collina <hello@matteocollina.com>

CI: https://ci.nodejs.org/job/node-test-pull-request/75413/

CI: https://ci.nodejs.org/job/node-test-pull-request/75428/

Commit Queue failed

- Loading data for nodejs/node/pull/64623 ✔ Done loading data for nodejs/node/pull/64623 ----------------------------------- PR info ------------------------------------ Title http2: increase default window sizes (#64623) Author Matteo Collina <matteo.collina@gmail.com> (@mcollina) Branch mcollina:increase-http2-window-size -> nodejs:main Labels c++, semver-major, lib / src Commits 5 - http2: increase default window sizes - http2: guard against null stream/req in OnStreamAfterReqFinished - http2: relax framesReceived assertion in perf_hooks test - stream: fix pending_writes underflow in StreamPipe shutdown - style: fix clang-format alignment in CHECK_EQ call Committers 1 - Matteo Collina <hello@matteocollina.com> PR-URL: https://github.com/nodejs/node/pull/64623 Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Tim Perry <pimterry@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day> Reviewed-By: Ethan Arrowood <ethan@arrowood.dev> Reviewed-By: Aviv Keller <me@aviv.sh> Reviewed-By: Robert Nagy <ronagy@icloud.com> Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com> ------------------------------ Generated metadata ------------------------------ PR-URL: https://github.com/nodejs/node/pull/64623 Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Tim Perry <pimterry@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day> Reviewed-By: Ethan Arrowood <ethan@arrowood.dev> Reviewed-By: Aviv Keller <me@aviv.sh> Reviewed-By: Robert Nagy <ronagy@icloud.com> Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com> -------------------------------------------------------------------------------- ℹ This PR was created on Mon, 20 Jul 2026 12:33:00 GMT ✔ Approvals: 8 ✔ - Rafael Gonzaga (@RafaelGSS) (TSC): https://github.com/nodejs/node/pull/64623#pullrequestreview-4737957628 ✔ - Tim Perry (@pimterry): https://github.com/nodejs/node/pull/64623#pullrequestreview-4765202215 ✔ - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/64623#pullrequestreview-4749623762 ✔ - Gürgün Dayıoğlu (@gurgunday): https://github.com/nodejs/node/pull/64623#pullrequestreview-4765616109 ✔ - Ethan Arrowood (@Ethan-Arrowood): https://github.com/nodejs/node/pull/64623#pullrequestreview-4767534645 ✔ - Aviv Keller (@avivkeller): https://github.com/nodejs/node/pull/64623#pullrequestreview-4770440465 ✔ - Robert Nagy (@ronag) (TSC): https://github.com/nodejs/node/pull/64623#pullrequestreview-4838488304 ✔ - Trivikram Kamat (@trivikr): https://github.com/nodejs/node/pull/64623#pullrequestreview-4841424027 ✔ Last GitHub CI successful ℹ Last Full PR CI on 2026-08-03T12:22:08Z: https://ci.nodejs.org/job/node-test-pull-request/75428/ - Querying data for job/node-test-pull-request/75428/ ✔ Build data downloaded ✔ Last Jenkins CI successful -------------------------------------------------------------------------------- ✔ No git cherry-pick in progress ✔ No git am in progress ✔ No git rebase in progress -------------------------------------------------------------------------------- - Bringing origin/main up to date... From https://github.com/nodejs/node * branch main -> FETCH_HEAD ✔ origin/main is now up-to-date - Downloading patch for 64623 From https://github.com/nodejs/node * branch refs/pull/64623/merge -> FETCH_HEAD ✔ Fetched commits as 7e439828de88..f3993733daf8 -------------------------------------------------------------------------------- Auto-merging doc/api/http2.md [main d458cadee7] http2: increase default window sizes Author: Matteo Collina <hello@matteocollina.com> Date: Mon Jul 20 12:09:08 2026 +0000 16 files changed, 78 insertions(+), 61 deletions(-) [main 2e28518bd9] http2: guard against null stream/req in OnStreamAfterReqFinished Author: Matteo Collina <hello@matteocollina.com> Date: Thu Jul 23 14:28:24 2026 +0000 1 file changed, 2 insertions(+) [main 8974b46a94] http2: relax framesReceived assertion in perf_hooks test Author: Matteo Collina <hello@matteocollina.com> Date: Fri Jul 24 08:19:42 2026 +0000 1 file changed, 5 insertions(+), 1 deletion(-) [main 83d3ac6cb0] stream: fix pending_writes underflow in StreamPipe shutdown Author: Matteo Collina <hello@matteocollina.com> Date: Fri Jul 24 11:03:27 2026 +0000 1 file changed, 13 insertions(+), 4 deletions(-) [main 93ebe33adb] style: fix clang-format alignment in CHECK_EQ call Author: Matteo Collina <hello@matteocollina.com> Date: Fri Jul 24 15:10:46 2026 +0000 1 file changed, 3 insertions(+), 5 deletions(-) ✔ Patches applied There are 5 commits in the PR. Attempting autorebase. (node:365) [DEP0190] DeprecationWarning: Passing args to a child process with shell option true can lead to security vulnerabilities, as the arguments are not escaped, only concatenated. (Use `node --trace-deprecation ...` to show where the warning was created) Rebasing (2/10) Executing: git node land --amend --yes --------------------------------- New Message ---------------------------------- http2: increase default window sizes

Increase the default HTTP/2 stream window from 64KB (65535) to 4MB
(4194304) and the default local connection window to 32MB (33554432).

The default 64KB window limits throughput on high-latency connections
to window_size / RTT. With a 250ms RTT, throughput is limited to
256KB/s. The new defaults improve throughput to 16MB/s (128Mbps)
for the stream window and 128MB/s (1Gbps) for the connection window.

Fixes: #38426
Signed-off-by: Matteo Collina <hello@matteocollina.com>
PR-URL: #64623
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Tim Perry <pimterry@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Ethan Arrowood <ethan@arrowood.dev>
Reviewed-By: Aviv Keller <me@aviv.sh>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

[detached HEAD 221808bb0e] http2: increase default window sizes
Author: Matteo Collina <hello@matteocollina.com>
Date: Mon Jul 20 12:09:08 2026 +0000
16 files changed, 78 insertions(+), 61 deletions(-)
Rebasing (3/10)
Rebasing (4/10)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
http2: guard against null stream/req in OnStreamAfterReqFinished

When a stream is destroyed while a synchronous write is in flight
from StreamPipe::ProcessData, ReportWritesToJSStreamListener::
OnStreamAfterReqFinished can be called with a null stream_ or a
null req_wrap, causing a null pointer dereference. This race
becomes more likely with larger HTTP/2 windows (e.g., #38426)
because more data is in flight during session teardown.

Add early-return guards for both cases to prevent the crash.

Refs: #38426
Refs: #56825
Signed-off-by: Matteo Collina <hello@matteocollina.com>
PR-URL: #64623
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Tim Perry <pimterry@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Ethan Arrowood <ethan@arrowood.dev>
Reviewed-By: Aviv Keller <me@aviv.sh>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

[detached HEAD 83b091065d] http2: guard against null stream/req in OnStreamAfterReqFinished
Author: Matteo Collina <hello@matteocollina.com>
Date: Thu Jul 23 14:28:24 2026 +0000
1 file changed, 2 insertions(+)
Rebasing (5/10)
Rebasing (6/10)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
http2: relax framesReceived assertion in perf_hooks test

With the default window size increase, the server sends an additional
WINDOW_UPDATE frame during session setup, increasing the frames received
by the client from 7 to 8 on some platforms. Relax the assertion to
check >= 7 instead of strict equality.

Refs: #38426
Signed-off-by: Matteo Collina <hello@matteocollina.com>
PR-URL: #64623
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Tim Perry <pimterry@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Ethan Arrowood <ethan@arrowood.dev>
Reviewed-By: Aviv Keller <me@aviv.sh>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

[detached HEAD 4a7c271e8b] http2: relax framesReceived assertion in perf_hooks test
Author: Matteo Collina <hello@matteocollina.com>
Date: Fri Jul 24 08:19:42 2026 +0000
1 file changed, 5 insertions(+), 1 deletion(-)
Rebasing (7/10)
Rebasing (8/10)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
stream: fix pending_writes underflow in StreamPipe shutdown

When the writable sink is destroyed while there are still pending
writes, WritableListener::OnStreamDestroy previously reset
pending_writes_ to 0. This caused OnStreamAfterWrite to decrement
the counter below 0, making the pending_writes_ == 0 completion
check fail permanently — the oncomplete callback was never called,
causing a timeout.

Fix by:

Not resetting pending_writes_ in OnStreamDestroy — let
OnStreamAfterWrite track completion naturally.
Using sink_destroyed_ flag in Unpipe to always remove the
writable listener regardless of pending_writes_ count.
Using <= 0 (instead of == 0) when sink_destroyed_ is set,
and guarding RemoveStreamListener against a null stream.

This race became more likely with larger HTTP/2 windows (#38426)
because more writes are in flight when session teardown begins.

Refs: #38426
Refs: #56825
Signed-off-by: Matteo Collina <hello@matteocollina.com>
PR-URL: #64623
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Tim Perry <pimterry@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Ethan Arrowood <ethan@arrowood.dev>
Reviewed-By: Aviv Keller <me@aviv.sh>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

[detached HEAD 9d0e7f3fd7] stream: fix pending_writes underflow in StreamPipe shutdown
Author: Matteo Collina <hello@matteocollina.com>
Date: Fri Jul 24 11:03:27 2026 +0000
1 file changed, 13 insertions(+), 4 deletions(-)
Rebasing (9/10)
Rebasing (10/10)
Executing: git node land --amend --yes
--------------------------------- New Message ----------------------------------
style: fix clang-format alignment in CHECK_EQ call

Signed-off-by: Matteo Collina <hello@matteocollina.com>
PR-URL: #64623
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Tim Perry <pimterry@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Ethan Arrowood <ethan@arrowood.dev>
Reviewed-By: Aviv Keller <me@aviv.sh>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

[detached HEAD 6cbbcc670b] style: fix clang-format alignment in CHECK_EQ call
Author: Matteo Collina <hello@matteocollina.com>
Date: Fri Jul 24 15:10:46 2026 +0000
1 file changed, 3 insertions(+), 5 deletions(-)
Successfully rebased and updated refs/heads/main.

ℹ Add commit-queue-squash label to land the PR as one commit, or commit-queue-rebase to land as separate commits.

https://github.com/nodejs/node/actions/runs/30825144898

@mcollina This either needs commit-queue-squash or commit-queue-rebase

Landed in 1576cb8

Increase the default HTTP/2 stream window from 64KB (65535) to 4MB (4194304) and the default local connection window to 32MB (33554432). The default 64KB window limits throughput on high-latency connections to window_size / RTT. With a 250ms RTT, throughput is limited to 256KB/s. The new defaults improve throughput to 16MB/s (128Mbps) for the stream window and 128MB/s (1Gbps) for the connection window. Fixes: #38426 Signed-off-by: Matteo Collina <hello@matteocollina.com> PR-URL: #64623 Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Tim Perry <pimterry@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day> Reviewed-By: Ethan Arrowood <ethan@arrowood.dev> Reviewed-By: Aviv Keller <me@aviv.sh> Reviewed-By: Robert Nagy <ronagy@icloud.com> Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

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style: fix clang-format alignment in CHECK_EQ call

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Signed-off-by: Matteo Collina <hello@matteocollina.com>

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pimterry mentioned this pull request Aug 6, 2026

stream: fix flaky stream destroy, reachable from HTTP/2 teardown #65079

Closed

pimterry mentioned this pull request Aug 20, 2026

http2: fix write deadlock exposed by larger window sizes #65440

Merged

+                // to window_size / RTT. With a 32MB connection window, throughput is
+                // significantly improved. See https://github.com/nodejs/node/issues/38426
+                CHECK_EQ(nghttp2_session_set_local_window_size(
+                    session, NGHTTP2_FLAG_NONE, 0, 33554432), 0);

+                // to window_size / RTT. With a 32MB connection window, throughput is
+                // significantly improved. See https://github.com/nodejs/node/issues/38426
+                CHECK_EQ(nghttp2_session_set_local_window_size(
+                    session, NGHTTP2_FLAG_NONE, 0, 33554432), 0);

http2: increase default window sizes by mcollina · Pull Request #64623 · nodejs/node · GitHub

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[detached HEAD 6cbbcc670b] style: fix clang-format alignment in CHECK_EQ call Author: Matteo Collina <hello@matteocollina.com> Date: Fri Jul 24 15:10:46 2026 +0000 1 file changed, 3 insertions(+), 5 deletions(-) Successfully rebased and updated refs/heads/main.

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[detached HEAD 6cbbcc670b] style: fix clang-format alignment in CHECK_EQ call
Author: Matteo Collina <hello@matteocollina.com>
Date: Fri Jul 24 15:10:46 2026 +0000
1 file changed, 3 insertions(+), 5 deletions(-)
Successfully rebased and updated refs/heads/main.