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fanquake 5ecd14a31c
Merge bitcoin/bitcoin#26844: Net: Pass MSG_MORE flag when sending non-final network messages (round 2) 
691eaf8873 Pass MSG_MORE flag when sending non-final network messages (Matt Whitlock)

Pull request description:

  **N.B.:** This is my second attempt at introducing this optimization. #12519 (2018) was closed in deference to switching to doing gathering socket writes using `sendmsg(2)`, which I agree would have superior performance due to fewer syscalls, but that work was apparently abandoned in late 2018. Ever since, Bitcoin Core has continued writing tons of runt packets to the wire. Can we proceed with my halfway solution for now?

  ----

  Since Nagle's algorithm is disabled, each and every call to `send(2)` can potentially generate a separate TCP segment on the wire. This is especially inefficient when sending the tiny header preceding each message payload.

  Linux implements a `MSG_MORE` flag that tells the kernel not to push the passed data immediately to the connected peer but rather to collect it in the socket's internal transmit buffer where it can be combined with data from successive calls to `send(2)`. Where available, specify this flag when calling `send(2)` in `CConnman::SocketSendData(CNode &)` if the data buffer being sent is not the last one in `node.vSendMsg`.

ACKs for top commit:
  sipa:
    ACK 691eaf8873
  vasild:
    ACK 691eaf8873

Tree-SHA512: 9a7f46bc12edbf78d488f05d1c46760110a24c95af74b627d2604fcd198fa3f511c5956bac36d0034e88c632d432f7d394147e667a11b027af0a30f70a546d70
2023-02-15 16:10:46 +00:00
.github doc: remove usages of C++11 2023-01-12 13:42:44 +00:00
.tx Adjust .tx/config for new Transifex CLI 2022-10-15 19:11:39 +01:00
build-aux/m4 build: remove Boost lib detection from ax_boost_base 2023-01-13 10:41:33 +00:00
build_msvc Merge bitcoin/bitcoin#26691: Update secp256k1 subtree to libsecp256k1 version 0.2.0 2023-01-13 09:40:57 +00:00
ci Merge bitcoin/bitcoin#27033: ci: Cache stuff in volumes, not host folders 2023-02-13 11:53:50 +01:00
contrib verify-commits: Bump trusted git root to after most recent laanwj merge 2023-02-10 11:36:06 -05:00
depends Merge bitcoin/bitcoin#26994: depends: define __BSD_VISIBLE for FreeBSD bdb build 2023-02-08 16:37:09 +01:00
doc Merge bitcoin/bitcoin#27016: mapport: require miniupnpc API version 17 or later 2023-02-13 16:25:09 +00:00
share Modernize rpcauth.py and its tests 2023-02-13 17:11:15 -05:00
src Merge bitcoin/bitcoin#26844: Net: Pass MSG_MORE flag when sending non-final network messages (round 2) 2023-02-15 16:10:46 +00:00
test Merge bitcoin/bitcoin#27035: test: simplify and speedup mempool_updatefromblock.py by using MiniWallet 2023-02-15 16:26:00 +01:00
.cirrus.yml ci: Fix fingerprint_script for depends subdir caches 2023-02-09 22:20:42 +00:00
.editorconfig ci: Drop AppVeyor CI integration 2021-09-07 06:12:53 +03:00
.gitattributes Separate protocol versioning from clientversion 2014-10-29 00:24:40 -04:00
.gitignore refactor: cleanups post unsubtree'ing univalue 2022-06-15 12:56:44 +01:00
.python-version Bump minimum python version to 3.7 2023-01-18 12:59:11 +01:00
.style.yapf test: .style.yapf: Set column_limit=160 2019-03-04 18:28:13 -05:00
autogen.sh scripted-diff: Bump copyright of files changed in 2019 2019-12-30 10:42:20 +13:00
configure.ac Merge bitcoin/bitcoin#27016: mapport: require miniupnpc API version 17 or later 2023-02-13 16:25:09 +00:00
CONTRIBUTING.md doc: Explain squashing with merge commits 2022-05-24 08:17:41 +02:00
COPYING doc: Update license year range to 2023 2022-12-24 11:40:16 +01:00
INSTALL.md doc: Added hyperlink for doc/build 2021-09-09 19:53:12 +05:30
libbitcoinconsensus.pc.in build: remove libcrypto as internal dependency in libbitcoinconsensus.pc 2019-11-19 15:03:44 +01:00
Makefile.am build: package test_bitcoin in Windows installer 2022-08-09 09:13:23 +01:00
README.md doc: Explain Bitcoin Core in README.md 2022-05-10 07:49:09 +02:00
SECURITY.md doc: Add my key to SECURITY.md 2022-08-23 16:57:46 -04:00

README.md

Bitcoin Core integration/staging tree

https://bitcoincore.org

For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.

What is Bitcoin Core?

Bitcoin Core connects to the Bitcoin peer-to-peer network to download and fully validate blocks and transactions. It also includes a wallet and graphical user interface, which can be optionally built.

Further information about Bitcoin Core is available in the doc folder.

License

Bitcoin Core is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/MIT.

Development Process

The master branch is regularly built (see doc/build-*.md for instructions) and tested, but it is not guaranteed to be completely stable. Tags are created regularly from release branches to indicate new official, stable release versions of Bitcoin Core.

The https://github.com/bitcoin-core/gui repository is used exclusively for the development of the GUI. Its master branch is identical in all monotree repositories. Release branches and tags do not exist, so please do not fork that repository unless it is for development reasons.

The contribution workflow is described in CONTRIBUTING.md and useful hints for developers can be found in doc/developer-notes.md.

Testing

Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money.

Automated Testing

Developers are strongly encouraged to write unit tests for new code, and to submit new unit tests for old code. Unit tests can be compiled and run (assuming they weren't disabled in configure) with: make check. Further details on running and extending unit tests can be found in /src/test/README.md.

There are also regression and integration tests, written in Python. These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py

The CI (Continuous Integration) systems make sure that every pull request is built for Windows, Linux, and macOS, and that unit/sanity tests are run automatically.

Manual Quality Assurance (QA) Testing

Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.

Translations

Changes to translations as well as new translations can be submitted to Bitcoin Core's Transifex page.

Translations are periodically pulled from Transifex and merged into the git repository. See the translation process for details on how this works.

Important: We do not accept translation changes as GitHub pull requests because the next pull from Transifex would automatically overwrite them again.