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Each QUIC MUX may allocate buffers for MUX stream emission. These buffers are then shared with quic_conn to handle ACK reception and retransmission. A limit on the number of concurrent buffers used per connection has been defined statically and can be updated via a configuration option. This commit replaces the limit to instead use the current underlying congestion window size. The purpose of this change is to remove the artificial static buffer count limit, which may be difficult to choose. Indeed, if a connection performs with minimal loss rate, the buffer count would limit severely its throughput. It could be increase to fix this, but it also impacts others connections, even with less optimal performance, causing too many extra data buffering on the MUX layer. By using the dynamic congestion window size, haproxy ensures that MUX buffering corresponds roughly to the network conditions. Using QCC <buf_in_flight>, a new buffer can be allocated if it is less than the current window size. If not, QCS emission is interrupted and haproxy stream layer will subscribe until a new buffer is ready. One of the criticals parts is to ensure that MUX layer previously blocked on buffer allocation is properly woken up when sending can be retried. This occurs on two occasions : * after an already used Tx buffer is cleared on ACK reception. This case is already handled by qcc_notify_buf() via quic_stream layer. * on congestion window increase. A new qcc_notify_buf() invokation is added into qc_notify_send(). Finally, remove <avail_bufs> QCC field which is now unused. This commit is labelled MAJOR as it may have unexpected effect and could cause significant behavior change. For example, in previous implementation QUIC MUX would be able to buffer more data even if the congestion window is small. With this patch, data cannot be transferred from the stream layer which may cause more streams to be shut down on client timeout. Another effect may be more CPU consumption as the connection limit would be hit more often, causing more streams to be interrupted and woken up in cycle. |
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HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
Please refer to the following files depending on what you're looking for:
- INSTALL for instructions on how to build and install HAProxy
- BRANCHES to understand the project's life cycle and what version to use
- LICENSE for the project's license
- CONTRIBUTING for the process to follow to submit contributions
The more detailed documentation is located into the doc/ directory:
- doc/intro.txt for a quick introduction on HAProxy
- doc/configuration.txt for the configuration's reference manual
- doc/lua.txt for the Lua's reference manual
- doc/SPOE.txt for how to use the SPOE engine
- doc/network-namespaces.txt for how to use network namespaces under Linux
- doc/management.txt for the management guide
- doc/regression-testing.txt for how to use the regression testing suite
- doc/peers.txt for the peers protocol reference
- doc/coding-style.txt for how to adopt HAProxy's coding style
- doc/internals for developer-specific documentation (not all up to date)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.