mainlining shenanigans
38e3bfa869
Mat Martineau says: ==================== mptcp: Improve use of backup subflows Multipath TCP combines multiple TCP subflows in to one stream, and the MPTCP-level socket must decide which subflow to use when sending (or resending) chunks of data. The choice of the "best" subflow to transmit on can vary depending on the priority (normal or backup) for each subflow and how well the subflow is performing. In order to improve MPTCP performance when some subflows are failing, this patch set changes how backup subflows are utilized and introduces tracking of "stale" subflows that are still connected but not making progress. Patch 1 adjusts MPTCP-level retransmit timeouts to use data from all subflows. Patch 2 makes MPTCP-level retransmissions less aggressive to avoid resending data that's still queued at the TCP level. Patch 3 changes the way pending data is handled when subflows are closed. Unacked MPTCP-level data still in the subflow tx queue is immediately moved to another subflow for transmission instead of waiting for MPTCP-level timeouts to trigger retransmission. Patch 4 has some sysctl code cleanup. Patches 5 and 6 add tracking of "stale" subflows, so only underlying TCP subflow connections that appear to be making progress are considered when selecting a subflow to (re)transmit data. How fast a subflow goes stale is configurable with a per-namespace sysctl. Related MIBS are added too. Patch 7 makes sure the backup flag is always correctly recorded when the MP_JOIN SYN/ACK is received for an added subflow. Patch 8 adds more test cases for backup subflows and stale subflows. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
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| net | ||
| samples | ||
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| security | ||
| sound | ||
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| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.