- Added a first set of profiles. Still need more work

- Fixed several issues with the tuned-adm tool, should work now

tune-profiles/default/ktune.sysconfig

@@ -0,0 +1,27 @@
+# ktune service configuration
+
+# This is the ktune sysctl file.  You can comment this out to prevent ktune
+# from applying its sysctl settings.
+SYSCTL="/etc/sysctl.ktune"
+
+# Use *.conf files in the ktune configuration directory /etc/ktune.d.
+#   Value: yes|no,  default: yes
+# It is useful if you want to load settings from additional files. Set this to
+# no if you to prevent ktune from using these additional files.
+USE_KTUNE_D="yes"
+
+# This is the custom sysctl configuration file.  Any settings in this file will
+# be applied after the ktune settings, overriding them.  Comment this out to
+# use only the ktune settings.
+SYSCTL_POST="/etc/sysctl.conf"
+
+# This is the I/O scheduler ktune will use.  This will *not* override anything
+# explicitly set on the kernel command line, nor will it change the scheduler
+# for any block device that is using a non-default scheduler when ktune starts.
+# You should probably leave this on "deadline", but "as", "cfq", and "noop" are
+# also legal values.  Comment this out to prevent ktune from changing I/O
+# scheduler settings.
+#ELEVATOR="deadline"
+
+# These are the devices, that should be tuned with the ELEVATOR
+ELEVATOR_TUNE_DEVS=""

tune-profiles/default/sysctl.ktune

@@ -0,0 +1 @@
+# ktune sysctl

tune-profiles/default/tuned.conf

@@ -0,0 +1,57 @@
+#
+# tuned configuration main service
+#
+
+[main]
+# Interval for monitoring and tuning. Default is 10s.
+# interval=10
+
+#
+# Disk monitoring section
+#
+[DiskMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# Disk tuning section
+#
+[DiskTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+# hdparm=False
+# alpm=False
+
+#
+# Net monitoring section
+#
+[NetMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# Net tuning section
+#
+[NetTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+enabled=False
+
+#
+# CPU monitoring section
+#
+[CPUMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# CPU tuning section
+#
+[CPUTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False

tune-profiles/desktop-powersave/ktune.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+ALPM="medium_power"
+
+# Set ALPM for all host adapters that support it
+for x in /sys/bus/scsi/devices/host*/scsi_host/host*/; do
+	hotplug="0"
+	if [ -e $x/sata_hotplug ]; then
+		hotplug="$(cat $x/sata_hotplug)"
+	fi
+	if [ "$hotplug" == "0" -a -e $x/link_power_management_policy ]; then
+		echo $ALPM > $x/link_power_management_policy
+	fi
+done

tune-profiles/desktop-powersave/ktune.sysconfig

@@ -0,0 +1,27 @@
+# ktune service configuration
+
+# This is the ktune sysctl file.  You can comment this out to prevent ktune
+# from applying its sysctl settings.
+SYSCTL="/etc/sysctl.ktune"
+
+# Use *.conf files in the ktune configuration directory /etc/ktune.d.
+#   Value: yes|no,  default: yes
+# It is useful if you want to load settings from additional files. Set this to
+# no if you to prevent ktune from using these additional files.
+USE_KTUNE_D="yes"
+
+# This is the custom sysctl configuration file.  Any settings in this file will
+# be applied after the ktune settings, overriding them.  Comment this out to
+# use only the ktune settings.
+SYSCTL_POST="/etc/sysctl.conf"
+
+# This is the I/O scheduler ktune will use.  This will *not* override anything
+# explicitly set on the kernel command line, nor will it change the scheduler
+# for any block device that is using a non-default scheduler when ktune starts.
+# You should probably leave this on "deadline", but "as", "cfq", and "noop" are
+# also legal values.  Comment this out to prevent ktune from changing I/O
+# scheduler settings.
+#ELEVATOR="deadline"
+
+# These are the devices, that should be tuned with the ELEVATOR
+#ELEVATOR_TUNE_DEVS="/sys/block/{sd,cciss}*/queue/scheduler"

tune-profiles/desktop-powersave/sysctl.ktune

@@ -0,0 +1 @@
+# ktune sysctl

tune-profiles/desktop-powersave/tuned.conf

@@ -0,0 +1,57 @@
+#
+# tuned configuration main service
+#
+
+[main]
+# Interval for monitoring and tuning. Default is 10s.
+# interval=10
+
+#
+# Disk monitoring section
+#
+[DiskMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# Disk tuning section
+#
+[DiskTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+# hdparm=False
+# alpm=False
+
+#
+# Net monitoring section
+#
+[NetMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# Net tuning section
+#
+[NetTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+enabled=False
+
+#
+# CPU monitoring section
+#
+[CPUMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# CPU tuning section
+#
+[CPUTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False

tune-profiles/laptop-ac-powersave/ktune.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+ALPM="medium_power"
+
+# Set ALPM for all host adapters that support it
+for x in /sys/bus/scsi/devices/host*/scsi_host/host*/; do
+	hotplug="0"
+	if [ -e $x/sata_hotplug ]; then
+		hotplug="$(cat $x/sata_hotplug)"
+	fi
+	if [ "$hotplug" == "0" -a -e $x/link_power_management_policy ]; then
+		echo $ALPM > $x/link_power_management_policy
+	fi
+done

tune-profiles/laptop-ac-powersave/ktune.sysconfig

@@ -0,0 +1,27 @@
+# ktune service configuration
+
+# This is the ktune sysctl file.  You can comment this out to prevent ktune
+# from applying its sysctl settings.
+SYSCTL="/etc/sysctl.ktune"
+
+# Use *.conf files in the ktune configuration directory /etc/ktune.d.
+#   Value: yes|no,  default: yes
+# It is useful if you want to load settings from additional files. Set this to
+# no if you to prevent ktune from using these additional files.
+USE_KTUNE_D="yes"
+
+# This is the custom sysctl configuration file.  Any settings in this file will
+# be applied after the ktune settings, overriding them.  Comment this out to
+# use only the ktune settings.
+SYSCTL_POST="/etc/sysctl.conf"
+
+# This is the I/O scheduler ktune will use.  This will *not* override anything
+# explicitly set on the kernel command line, nor will it change the scheduler
+# for any block device that is using a non-default scheduler when ktune starts.
+# You should probably leave this on "deadline", but "as", "cfq", and "noop" are
+# also legal values.  Comment this out to prevent ktune from changing I/O
+# scheduler settings.
+#ELEVATOR="deadline"
+
+# These are the devices, that should be tuned with the ELEVATOR
+#ELEVATOR_TUNE_DEVS="/sys/block/{sd,cciss}*/queue/scheduler"

tune-profiles/laptop-ac-powersave/sysctl.ktune

@@ -0,0 +1 @@
+# ktune sysctl settings

tune-profiles/laptop-ac-powersave/tuned.conf

@@ -0,0 +1,57 @@
+#
+# tuned configuration main service
+#
+
+[main]
+# Interval for monitoring and tuning. Default is 10s.
+# interval=10
+
+#
+# Disk monitoring section
+#
+[DiskMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# Disk tuning section
+#
+[DiskTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+# hdparm=False
+# alpm=False
+
+#
+# Net monitoring section
+#
+[NetMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# Net tuning section
+#
+[NetTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+enabled=False
+
+#
+# CPU monitoring section
+#
+[CPUMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# CPU tuning section
+#
+[CPUTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False

tune-profiles/laptop-battery-powersave/ktune.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+ALPM="min_power"
+
+# Set ALPM for all host adapters that support it
+for x in /sys/bus/scsi/devices/host*/scsi_host/host*/; do
+	hotplug="0"
+	if [ -e $x/sata_hotplug ]; then
+		hotplug="$(cat $x/sata_hotplug)"
+	fi
+	if [ "$hotplug" == "0" -a -e $x/link_power_management_policy ]; then
+		echo $ALPM > $x/link_power_management_policy
+	fi
+done
+
+# Enables USB autosuspend for all devices
+for i in /sys/bus/usb/devices/*/power/autosuspend; do echo 1 > $i; done
+
+# Enables multi core power savings for low wakeup systems
+[ -e /sys/devices/system/cpu/sched_mc_power_savings ] && echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
+
+# Enable ondemand governor (best for powersaving)
+[ -e /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor ] && echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
+
+# Enable AC97 audio power saving
+[ -e /sys/module/snd_ac97_codec/parameters/power_save ] && echo Y > /sys/module/snd_ac97_codec/parameters/power_save
+
+# Disable HAL polling of CDROMS
+for i in /dev/scd*; do hal-disable-polling --device $i; done
+
+# Enable power saving mode for Wi-Fi cards
+for i in /sys/bus/pci/devices/*/power_level ; do echo 5 > $i ; done

tune-profiles/laptop-battery-powersave/ktune.sysconfig

@@ -0,0 +1,27 @@
+# ktune service configuration
+
+# This is the ktune sysctl file.  You can comment this out to prevent ktune
+# from applying its sysctl settings.
+SYSCTL="/etc/sysctl.ktune"
+
+# Use *.conf files in the ktune configuration directory /etc/ktune.d.
+#   Value: yes|no,  default: yes
+# It is useful if you want to load settings from additional files. Set this to
+# no if you to prevent ktune from using these additional files.
+USE_KTUNE_D="yes"
+
+# This is the custom sysctl configuration file.  Any settings in this file will
+# be applied after the ktune settings, overriding them.  Comment this out to
+# use only the ktune settings.
+SYSCTL_POST="/etc/sysctl.conf"
+
+# This is the I/O scheduler ktune will use.  This will *not* override anything
+# explicitly set on the kernel command line, nor will it change the scheduler
+# for any block device that is using a non-default scheduler when ktune starts.
+# You should probably leave this on "deadline", but "as", "cfq", and "noop" are
+# also legal values.  Comment this out to prevent ktune from changing I/O
+# scheduler settings.
+#ELEVATOR="deadline"
+
+# These are the devices, that should be tuned with the ELEVATOR
+#ELEVATOR_TUNE_DEVS="/sys/block/{sd,cciss}*/queue/scheduler"

tune-profiles/laptop-battery-powersave/sysctl.ktune

@@ -0,0 +1,4 @@
+# ktune sysctl settings
+vm.laptop_mode=5
+vm.dirty_writeback_centisecs=1500
+kernel.nmi_watchdog=0

tune-profiles/laptop-battery-powersave/tuned.conf

@@ -0,0 +1,57 @@
+#
+# tuned configuration main service
+#
+
+[main]
+# Interval for monitoring and tuning. Default is 10s.
+# interval=10
+
+#
+# Disk monitoring section
+#
+[DiskMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# Disk tuning section
+#
+[DiskTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+# hdparm=False
+# alpm=False
+
+#
+# Net monitoring section
+#
+[NetMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# Net tuning section
+#
+[NetTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+enabled=False
+
+#
+# CPU monitoring section
+#
+[CPUMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# CPU tuning section
+#
+[CPUTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False

tune-profiles/latency-performance/ktune.sysconfig

@@ -0,0 +1,27 @@
+# ktune service configuration
+
+# This is the ktune sysctl file.  You can comment this out to prevent ktune
+# from applying its sysctl settings.
+SYSCTL="/etc/sysctl.ktune"
+
+# Use *.conf files in the ktune configuration directory /etc/ktune.d.
+#   Value: yes|no,  default: yes
+# It is useful if you want to load settings from additional files. Set this to
+# no if you to prevent ktune from using these additional files.
+USE_KTUNE_D="yes"
+
+# This is the custom sysctl configuration file.  Any settings in this file will
+# be applied after the ktune settings, overriding them.  Comment this out to
+# use only the ktune settings.
+SYSCTL_POST="/etc/sysctl.conf"
+
+# This is the I/O scheduler ktune will use.  This will *not* override anything
+# explicitly set on the kernel command line, nor will it change the scheduler
+# for any block device that is using a non-default scheduler when ktune starts.
+# You should probably leave this on "deadline", but "as", "cfq", and "noop" are
+# also legal values.  Comment this out to prevent ktune from changing I/O
+# scheduler settings.
+ELEVATOR="deadline"
+
+# These are the devices, that should be tuned with the ELEVATOR
+ELEVATOR_TUNE_DEVS="/sys/block/{sd,cciss}*/queue/scheduler"

tune-profiles/latency-performance/sysctl.ktune

@@ -0,0 +1,51 @@
+# ktune sysctl settings for EL 5 servers
+
+# 256 KB default performs well experimentally, and is often recommended by ISVs.
+net.core.rmem_default = 262144
+net.core.wmem_default = 262144
+
+# When opening a high-bandwidth connection while the receiving end is under
+# memory pressure, disk I/O may be necessary to free memory for the socket,
+# making disk latency the effective latency for the bandwidth-delay product
+# initially.  For 10 Gb ethernet and SCSI, the BDP is about 5 MB.  Allow 8 MB
+# to account for overhead, to ensure that new sockets can saturate the medium
+# quickly.
+net.core.rmem_max = 8388608
+net.core.wmem_max = 8388608
+
+# Allow a deep backlog for 10 Gb and bonded Gb ethernet connections
+net.core.netdev_max_backlog = 10000
+
+# Always have one page available, plus an extra for overhead, to ensure TCP NFS
+# pageout doesn't stall under memory pressure.  Default to max unscaled window,
+# plus overhead for rmem, since most LAN sockets won't need to scale.
+net.ipv4.tcp_rmem = 8192 87380 8388608
+net.ipv4.tcp_wmem = 8192 65536 8388608
+
+# Always have enough memory available on a UDP socket for an 8k NFS request,
+# plus overhead, to prevent NFS stalling under memory pressure.  16k is still
+# low enough that memory fragmentation is unlikely to cause problems.
+net.ipv4.udp_rmem_min = 16384
+net.ipv4.udp_wmem_min = 16384
+
+# Ensure there's enough memory to actually allocate those massive buffers to a
+# socket.
+net.ipv4.tcp_mem = 8388608 12582912 16777216
+net.ipv4.udp_mem = 8388608 12582912 16777216
+
+# Filesystem I/O is usually much more efficient than swapping, so try to keep
+# swapping low.  It's usually safe to go even lower than this on systems with
+# server-grade storage.
+vm.swappiness = 30
+
+# If a workload mostly uses anonymous memory and it hits this limit, the entire
+# working set is buffered for I/O, and any more write buffering would require
+# swapping, so it's time to throttle writes until I/O can catch up.  Workloads
+# that mostly use file mappings may be able to use even higher values.
+vm.dirty_ratio = 50
+
+# Ensure there's always some easily-dropped pagecache if the system is under
+# memory pressure from cached files, since it's much faster to page back in than
+# swap.
+# Doesn't exist for 2.6.30++ anymore
+# vm.pagecache = 90

tune-profiles/server-powersave/ktune.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+ALPM="medium_power"
+
+# Set ALPM for all host adapters that support it
+for x in /sys/bus/scsi/devices/host*/scsi_host/host*/; do
+	hotplug="0"
+	if [ -e $x/sata_hotplug ]; then
+		hotplug="$(cat $x/sata_hotplug)"
+	fi
+	if [ "$hotplug" == "0" -a -e $x/link_power_management_policy ]; then
+		echo $ALPM > $x/link_power_management_policy
+	fi
+done

tune-profiles/server-powersave/ktune.sysconfig

@@ -0,0 +1,27 @@
+# ktune service configuration
+
+# This is the ktune sysctl file.  You can comment this out to prevent ktune
+# from applying its sysctl settings.
+SYSCTL="/etc/sysctl.ktune"
+
+# Use *.conf files in the ktune configuration directory /etc/ktune.d.
+#   Value: yes|no,  default: yes
+# It is useful if you want to load settings from additional files. Set this to
+# no if you to prevent ktune from using these additional files.
+USE_KTUNE_D="yes"
+
+# This is the custom sysctl configuration file.  Any settings in this file will
+# be applied after the ktune settings, overriding them.  Comment this out to
+# use only the ktune settings.
+SYSCTL_POST="/etc/sysctl.conf"
+
+# This is the I/O scheduler ktune will use.  This will *not* override anything
+# explicitly set on the kernel command line, nor will it change the scheduler
+# for any block device that is using a non-default scheduler when ktune starts.
+# You should probably leave this on "deadline", but "as", "cfq", and "noop" are
+# also legal values.  Comment this out to prevent ktune from changing I/O
+# scheduler settings.
+#ELEVATOR="deadline"
+
+# These are the devices, that should be tuned with the ELEVATOR
+#ELEVATOR_TUNE_DEVS="/sys/block/{sd,cciss}*/queue/scheduler"

tune-profiles/server-powersave/sysctl.ktune

@@ -0,0 +1 @@
+# ktune sysctl settings

tune-profiles/server-powersave/tuned.conf

@@ -0,0 +1,57 @@
+#
+# tuned configuration main service
+#
+
+[main]
+# Interval for monitoring and tuning. Default is 10s.
+# interval=10
+
+#
+# Disk monitoring section
+#
+[DiskMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# Disk tuning section
+#
+[DiskTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+# hdparm=False
+# alpm=False
+
+#
+# Net monitoring section
+#
+[NetMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# Net tuning section
+#
+[NetTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+enabled=False
+
+#
+# CPU monitoring section
+#
+[CPUMonitor]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False
+
+#
+# CPU tuning section
+#
+[CPUTuning]
+# Enabled or disable the plugin. Default is True. Any other value
+# disables it.
+# enabled=False

tune-profiles/throughput-performance/ktune.sysconfig

@@ -0,0 +1,27 @@
+# ktune service configuration
+
+# This is the ktune sysctl file.  You can comment this out to prevent ktune
+# from applying its sysctl settings.
+SYSCTL="/etc/sysctl.ktune"
+
+# Use *.conf files in the ktune configuration directory /etc/ktune.d.
+#   Value: yes|no,  default: yes
+# It is useful if you want to load settings from additional files. Set this to
+# no if you to prevent ktune from using these additional files.
+USE_KTUNE_D="yes"
+
+# This is the custom sysctl configuration file.  Any settings in this file will
+# be applied after the ktune settings, overriding them.  Comment this out to
+# use only the ktune settings.
+SYSCTL_POST="/etc/sysctl.conf"
+
+# This is the I/O scheduler ktune will use.  This will *not* override anything
+# explicitly set on the kernel command line, nor will it change the scheduler
+# for any block device that is using a non-default scheduler when ktune starts.
+# You should probably leave this on "deadline", but "as", "cfq", and "noop" are
+# also legal values.  Comment this out to prevent ktune from changing I/O
+# scheduler settings.
+ELEVATOR="deadline"
+
+# These are the devices, that should be tuned with the ELEVATOR
+ELEVATOR_TUNE_DEVS="/sys/block/{sd,cciss}*/queue/scheduler"

tune-profiles/throughput-performance/sysctl.ktune

@@ -0,0 +1 @@
+# ktune sysctl settings

tune-profiles/throughput/ktune.sysconfig

@@ -0,0 +1,27 @@
+# ktune service configuration
+
+# This is the ktune sysctl file.  You can comment this out to prevent ktune
+# from applying its sysctl settings.
+SYSCTL="/etc/sysctl.ktune"
+
+# Use *.conf files in the ktune configuration directory /etc/ktune.d.
+#   Value: yes|no,  default: yes
+# It is useful if you want to load settings from additional files. Set this to
+# no if you to prevent ktune from using these additional files.
+USE_KTUNE_D="yes"
+
+# This is the custom sysctl configuration file.  Any settings in this file will
+# be applied after the ktune settings, overriding them.  Comment this out to
+# use only the ktune settings.
+SYSCTL_POST="/etc/sysctl.conf"
+
+# This is the I/O scheduler ktune will use.  This will *not* override anything
+# explicitly set on the kernel command line, nor will it change the scheduler
+# for any block device that is using a non-default scheduler when ktune starts.
+# You should probably leave this on "deadline", but "as", "cfq", and "noop" are
+# also legal values.  Comment this out to prevent ktune from changing I/O
+# scheduler settings.
+ELEVATOR="deadline"
+
+# These are the devices, that should be tuned with the ELEVATOR
+ELEVATOR_TUNE_DEVS="/sys/block/{sd,cciss}*/queue/scheduler"

tune-profiles/throughput/sysctl.ktune

@@ -0,0 +1,51 @@
+# ktune sysctl settings for EL 5 servers
+
+# 256 KB default performs well experimentally, and is often recommended by ISVs.
+net.core.rmem_default = 262144
+net.core.wmem_default = 262144
+
+# When opening a high-bandwidth connection while the receiving end is under
+# memory pressure, disk I/O may be necessary to free memory for the socket,
+# making disk latency the effective latency for the bandwidth-delay product
+# initially.  For 10 Gb ethernet and SCSI, the BDP is about 5 MB.  Allow 8 MB
+# to account for overhead, to ensure that new sockets can saturate the medium
+# quickly.
+net.core.rmem_max = 8388608
+net.core.wmem_max = 8388608
+
+# Allow a deep backlog for 10 Gb and bonded Gb ethernet connections
+net.core.netdev_max_backlog = 10000
+
+# Always have one page available, plus an extra for overhead, to ensure TCP NFS
+# pageout doesn't stall under memory pressure.  Default to max unscaled window,
+# plus overhead for rmem, since most LAN sockets won't need to scale.
+net.ipv4.tcp_rmem = 8192 87380 8388608
+net.ipv4.tcp_wmem = 8192 65536 8388608
+
+# Always have enough memory available on a UDP socket for an 8k NFS request,
+# plus overhead, to prevent NFS stalling under memory pressure.  16k is still
+# low enough that memory fragmentation is unlikely to cause problems.
+net.ipv4.udp_rmem_min = 16384
+net.ipv4.udp_wmem_min = 16384
+
+# Ensure there's enough memory to actually allocate those massive buffers to a
+# socket.
+net.ipv4.tcp_mem = 8388608 12582912 16777216
+net.ipv4.udp_mem = 8388608 12582912 16777216
+
+# Filesystem I/O is usually much more efficient than swapping, so try to keep
+# swapping low.  It's usually safe to go even lower than this on systems with
+# server-grade storage.
+vm.swappiness = 30
+
+# If a workload mostly uses anonymous memory and it hits this limit, the entire
+# working set is buffered for I/O, and any more write buffering would require
+# swapping, so it's time to throttle writes until I/O can catch up.  Workloads
+# that mostly use file mappings may be able to use even higher values.
+vm.dirty_ratio = 50
+
+# Ensure there's always some easily-dropped pagecache if the system is under
+# memory pressure from cached files, since it's much faster to page back in than
+# swap.
+# Doesn't exist for 2.6.30++ anymore
+# vm.pagecache = 90