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ccd0628fca
Currently, tcp_sack_new_ofo_skb() sends an ack if prior acks were 'compressed', if room has to be made in tp->selective_acks[] But there is no guarantee all four sack ranges can be included in SACK option. As a matter of fact, when TCP timestamps option is used, only three SACK ranges can be included. Lets assume only two ranges can be included, and force the ack: - When we touch more than 2 ranges in the reordering done if tcp_sack_extend() could be done. - If we have at least 2 ranges when adding a new one. This enforces that before a range is in third or fourth position, at least one ACK packet included it in first/second position. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.