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Yuchung Cheng says: ==================== tcp: RACK fast recovery The patch set enables RACK loss detection (draft-ietf-tcpm-rack-01) to trigger fast recovery with a reordering timer. Previously RACK has been running in auxiliary mode where it is used to detect packet losses once the recovery has triggered by other algorithms (e.g., FACK). By inspecting packet timestamps, RACK can start ACK-driven repairs timely. A few similar heuristics are no longer needed and are either removed or disabled to reduce the complexity of the Linux TCP loss recovery engine: 1. FACK (Forward Acknowledgement) 2. Early Retransmit (RFC5827) 3. thin_dupack (fast recovery on single DUPACK for thin-streams) 4. NCR (Non-Congestion Robustness RFC4653) (RFC4653) 5. Forward Retransmit After this change, Linux's loss recovery algorithms consist of 1. Conventional DUPACK threshold approach (RFC6675) 2. RACK and Tail Loss Probe (draft-ietf-tcpm-rack-01) 3. RTO plus F-RTO extension (RFC5682) The patch set has been tested on Google servers extensively and presented in several IETF meetings. The data suggests that RACK successfully improves recovery performance: https://www.ietf.org/proceedings/97/slides/slides-97-tcpm-draft-ietf-tcpm-rack-01.pdf https://www.ietf.org/proceedings/96/slides/slides-96-tcpm-3.pdf ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.