From 58b3c9b58ab833cf5c3ab3d90a6f7d5ff3cf7879 Mon Sep 17 00:00:00 2001 From: Michael Tremer Date: Mon, 14 Oct 2019 16:44:54 +0000 Subject: [PATCH] sysctl: Adopt more settings from the IBM HPC guidelines https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/Welcome%20to%20High%20Performance%20Computing%20%28HPC%29%20Central/page/Linux%20System%20Tuning%20Recommendations Since we have already configured most of our IP/TCP stack for low latency and fast throughput, these settings complete those efforts. Signed-off-by: Michael Tremer Signed-off-by: Arne Fitzenreiter --- config/etc/sysctl.conf | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/config/etc/sysctl.conf b/config/etc/sysctl.conf index 9a943fffa8..d11e53c88d 100644 --- a/config/etc/sysctl.conf +++ b/config/etc/sysctl.conf @@ -76,9 +76,16 @@ vm.swappiness = 1 kernel.sched_migration_cost_ns = 5000000 # Increase kernel buffer size maximums +net.ipv4.tcp_mem = 16777216 16777216 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 16384 16777216 net.ipv4.udp_mem = 3145728 4194304 16777216 +# Prefer low latency over higher throughput +net.ipv4.tcp_low_latency=1 + +# Reserve more socket space for the TCP window +net.ipv4.tcp_adv_win_scale=2 + # Enable TCP fast-open net.ipv4.tcp_fastopen = 3 -- 2.39.2