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Eric Dumazet says: ==================== tcp: provide correct skb->priority SO_PRIORITY socket option requests TCP egress packets to contain a user provided value. TCP manages to send most packets with the requested values, notably for TCP_ESTABLISHED state, but fails to do so for few packets. These packets are control packets sent on behalf of SYN_RECV or TIME_WAIT states. Note that to test this with packetdrill, it is a bit of a hassle, since packetdrill can not verify priority of egress packets, other than indirect observations, using for example sch_prio on its tunnel device. The bad skb priorities cause problems for GCP, as this field is one of the keys used in routing. ==================== 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.