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Haiyang ZhangandSasha Levin
4ec8a98b3d
[ Upstream commit562b1fdf06] TCP pingpong threshold is 1 by default. But some applications, like SQL DB may prefer a higher pingpong threshold to activate delayed acks in quick ack mode for better performance. The pingpong threshold and related code were changed to 3 in the year 2019 in: commit4a41f453be("tcp: change pingpong threshold to 3") And reverted to 1 in the year 2022 in: commit4d8f24eeed("Revert "tcp: change pingpong threshold to 3"") There is no single value that fits all applications. Add net.ipv4.tcp_pingpong_thresh sysctl tunable, so it can be tuned for optimal performance based on the application needs. Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Reviewed-by: Simon Horman <horms@kernel.org> Reviewed-by: Eric Dumazet <edumazet@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com> Link: https://lore.kernel.org/r/1697056244-21888-1-git-send-email-haiyangz@microsoft.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Stable-dep-of:87b08913a9("inet: move icmp_global_{credit,stamp} to a separate cache line") Signed-off-by: Sasha Levin <sashal@kernel.org>
