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| Filename | Latest commit message | Latest commit date |
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678550c651
Currently the retransmission stats are not incremented if the retransmit fails locally. But we always increment the other packet counters that track total packet/bytes sent. Awkwardly while we don't count these failed retransmits in RETRANSSEGS, we do count them in FAILEDRETRANS. If the qdisc is dropping many packets this could under-estimate TCP retransmission rate substantially from both SNMP or per-socket TCP_INFO stats. This patch changes this by always incrementing retransmission stats on retransmission attempts and failures. Another motivation is to properly track retransmists in SCM_TIMESTAMPING_OPT_STATS. Since SCM_TSTAMP_SCHED collection is triggered in tcp_transmit_skb(), If tp->total_retrans is incremented after the function, we'll always mis-count by the amount of the latest retransmission. Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Acked-by: Eric Dumazet <edumazet@google.com> 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.