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 <michael.tremer@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>
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