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Integrate parts of this commit: This commit brings in a new refactored TCP stack called Rack. Rack includes the following features: - A different SACK processing scheme (the old sack structures are not used). - RACK (Recent acknowledgment) where counting dup-acks is no longer done instead time is used to knwo when to retransmit. (see the I-D) - TLP (Tail Loss Probe) where we will probe for tail-losses to attempt to try not to take a retransmit time-out. (see the I-D) - Burst mitigation using TCPHTPS - PRR (partial rate reduction) see the RFC. Once built into your kernel, you can select this stack by either socket option with the name of the stack is "rack" or by setting the global sysctl so the default is rack. Note that any connection that does not support SACK will be kicked back to the "default" base FreeBSD stack (currently known as "default"). To build this into your kernel you will need to enable in your kernel: makeoptions WITH_EXTRA_TCP_STACKS=1 options TCPHPTS Sponsored by: Netflix Inc. Differential Revision: https://reviews.freebsd.org/D15525
Real-Time Executive for Multiprocessing Systems (RTEMS)
-------------------------------------------------------
RTEMS, Real-Time Executive for Multiprocessor Systems, is a real-time executive
(kernel) which provides a high performance environment for embedded
applications with the following features:
- standards based user interfaces
- multitasking capabilities
- homogeneous and heterogeneous multiprocessor systems
- event-driven, priority-based, preemptive scheduling
- optional rate monotonic scheduling
- intertask communication and synchronization
- priority inheritance
- responsive interrupt management
- dynamic memory allocation
- high level of user configurability
- open source with a friendly user license
Project git repositories are located at https://git.rtems.org/
RTEMS Kernel: https : https://git.rtems.org/rtems/
RTEMS Source Builder : https://git.rtems.org/rtems-source-builder/
RTEMS Tools : https://git.rtems.org/rtems-tools/
RTEMS Documentation : https://git.rtems.org/rtems-docs/
RTEMS FreeBSD : https://git.rtems.org/rtems-libbsd/
Online documentation is available at https://docs.rtems.org/
RTEMS User Manual : https://docs.rtems.org/branches/master/user/index.html
RTEMS RSB Manual : https://docs.rtems.org/branches/master/rsb/index.html
RTEMS Classic API : https://docs.rtems.org/branches/master/c-user/index.html
RTEMS POSIX API : https://docs.rtems.org/branches/master/posix-users/index.html
RTEMS Doxygen for CPUKit : https://docs.rtems.org/doxygen/branches/master/
RTEMS POSIX 1003.1 Compliance Guide :
https://docs.rtems.org/branches/master/posix-compliance/index.html
- Details the standards base functionality and profiles RTEMS supportsXo
RTEMS Developers Wiki : http://devel.rtems.org
- Bug reporting, community knowledge and tutorials.
RTEMS Mailing Lists : https://lists.rtems.org/mailman/listinfo
- The RTEMS Project maintains mailing lists which are used for most
discussions:
* For general-purpose questions related to using RTEMS, use the rtems-users
ml: https://lists.rtems.org/mailman/listinfo/users
* For questions and discussion related to development of RTEMS, use the
rtems-devel ml: https://lists.rtems.org/mailman/listinfo/devel
The version number for this software is indicated in the VERSION file.