From c6fe1512d6e859a48f218d25d726ad2835730c7e Mon Sep 17 00:00:00 2001
From: Eduard Toloza <tolosaeduard@gmail.com>
Date: Fri, 9 Aug 2019 00:32:07 -0500
Subject: [PATCH] Added files

---
 etc/sysctl.d/80-network-tuning.conf    | 76 ++++++++++++++++++++++++++
 etc/sysctl.d/90-vm-tuning.conf         |  5 ++
 etc/udev/rules.d/60-ioschedulers.rules |  2 +
 etc/udev/rules.d/69-hdparm.rules       |  1 +
 etc/udev/udev.conf                     | 10 ++++
 5 files changed, 94 insertions(+)
 create mode 100644 etc/sysctl.d/80-network-tuning.conf
 create mode 100644 etc/sysctl.d/90-vm-tuning.conf
 create mode 100644 etc/udev/rules.d/60-ioschedulers.rules
 create mode 100644 etc/udev/rules.d/69-hdparm.rules
 create mode 100644 etc/udev/udev.conf

diff --git a/etc/sysctl.d/80-network-tuning.conf b/etc/sysctl.d/80-network-tuning.conf
new file mode 100644
index 0000000..63c0920
--- /dev/null
+++ b/etc/sysctl.d/80-network-tuning.conf
@@ -0,0 +1,76 @@
+# Disable Explicit Congestion Notification in TCP
+net.ipv4.tcp_ecn=0
+
+# window scaling
+net.ipv4.tcp_window_scaling=1
+
+# increase linux autotuning tcp buffer limits
+net.ipv4.tcp_rmem=8192 87380 16777216
+net.ipv4.tcp_wmem=8192 65536 16777216
+
+# increase TCP max buffer size
+net.core.rmem_max=16777216
+net.core.wmem_max=16777216
+
+# Increase number of incoming connections backlog
+net.core.netdev_max_backlog=16384
+net.core.dev_weight=64
+
+# Increase number of incoming connections
+net.core.somaxconn=32768
+
+# Increase the maximum amount of option memory buffers
+net.core.optmem_max=65535
+
+# Increase the tcp-time-wait buckets pool size to prevent simple DOS attacks
+net.ipv4.tcp_max_tw_buckets=1440000
+
+# try to reuse time-wait connections, but don't recycle them (recycle can break clients behind NAT)
+net.ipv4.tcp_tw_reuse=1
+
+# Limit number of orphans, each orphan can eat up to 16M (max wmem) of unswappable memory
+net.ipv4.tcp_max_orphans=16384
+net.ipv4.tcp_orphan_retries=0
+
+# don't cache ssthresh from previous connection
+net.ipv4.tcp_no_metrics_save=1
+net.ipv4.tcp_moderate_rcvbuf=1
+
+# Increase size of RPC datagram queue length
+net.unix.max_dgram_qlen=50
+
+# Don't allow the arp table to become bigger than this
+net.ipv4.neigh.default.gc_thresh3=2048
+
+# Tell the gc when to become aggressive with arp table cleaning.
+# Adjust this based on size of the LAN. 1024 is suitable for most /24 networks
+net.ipv4.neigh.default.gc_thresh2=1024
+
+# Adjust where the gc will leave arp table alone - set to 32.
+net.ipv4.neigh.default.gc_thresh1=32
+
+# Adjust to arp table gc to clean-up more often
+net.ipv4.neigh.default.gc_interval=30
+
+# Increase TCP queue length
+net.ipv4.neigh.default.proxy_qlen=96
+net.ipv4.neigh.default.unres_qlen=6
+
+# Enable Explicit Congestion Notification (RFC 3168), disable it if it doesn't work for you
+net.ipv4.tcp_ecn=1
+net.ipv4.tcp_reordering=3
+
+# How many times to retry killing an alive TCP connection
+net.ipv4.tcp_retries2=15
+net.ipv4.tcp_retries1=3
+
+# Avoid falling back to slow start after a connection goes idle
+# keeps our cwnd large with the keep alive connections (kernel > 3.6)
+net.ipv4.tcp_slow_start_after_idle=0
+
+# Allow the TCP fastopen flag to be used, beware some firewalls do not like TFO! (kernel > 3.7)
+net.ipv4.tcp_fastopen=3
+
+# This will enusre that immediatly subsequent connections use the new values
+net.ipv4.route.flush=1
+net.ipv6.route.flush=1
diff --git a/etc/sysctl.d/90-vm-tuning.conf b/etc/sysctl.d/90-vm-tuning.conf
new file mode 100644
index 0000000..6ac3ea5
--- /dev/null
+++ b/etc/sysctl.d/90-vm-tuning.conf
@@ -0,0 +1,5 @@
+vm.swappiness=10
+vm.vfs_cache_pressure=10
+vm.dirty_background_ratio=50
+vm.dirty_ratio=80
+vm.page-cluster=16
diff --git a/etc/udev/rules.d/60-ioschedulers.rules b/etc/udev/rules.d/60-ioschedulers.rules
new file mode 100644
index 0000000..51d5c0d
--- /dev/null
+++ b/etc/udev/rules.d/60-ioschedulers.rules
@@ -0,0 +1,2 @@
+# set scheduler for rotating disks
+ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="bfq"
diff --git a/etc/udev/rules.d/69-hdparm.rules b/etc/udev/rules.d/69-hdparm.rules
new file mode 100644
index 0000000..135913d
--- /dev/null
+++ b/etc/udev/rules.d/69-hdparm.rules
@@ -0,0 +1 @@
+ACTION=="add", SUBSYSTEM=="block", KERNEL=="sda", RUN+="/usr/bin/hdparm -B 254 -S 0 /dev/sda"
diff --git a/etc/udev/udev.conf b/etc/udev/udev.conf
new file mode 100644
index 0000000..7deb771
--- /dev/null
+++ b/etc/udev/udev.conf
@@ -0,0 +1,10 @@
+# see udev.conf(5) for details
+#
+# udevd is also started in the initrd.  When this file is modified you might
+# also want to rebuild the initrd, so that it will include the modified configuration.
+
+#udev_log=info
+#children_max=
+#exec_delay=
+#event_timeout=180
+#resolve_names=early