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After the mentioned commit, some of our packetdrill tests became flaky. TCP_SYNCNT socket option can limit the number of SYN retransmits. retransmits_timed_out() has to compare times computations based on local_clock() while timers are based on jiffies. With NTP adjustments and roundings we can observe 999 ms delay for 1000 ms timers. We end up sending one extra SYN packet. Gimmick added in commit6fa12c8503("Revert Backoff [v3]: Calculate TCP's connection close threshold as a time value") makes no real sense for TCP_SYN_SENT sockets where no RTO backoff can happen at all. Lets use a simpler logic for TCP_SYN_SENT sockets and remove @syn_set parameter from retransmits_timed_out() Fixes:9a568de481("tcp: switch TCP TS option (RFC 7323) to 1ms clock") Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.