I recently bought an 120GB SSD drive and I wanted to tweak my OS for it. I found some tutorial to do that and I followed it, but I've found some problems.
I wanted to change vm.dirty_ratio
value to 60, so I've added this line: vm.dirty_ratio = 60
at the end of my /etc/sysctl.conf
. Then I rebooted my computer to apply changes.
Now when I use sysctl vm.dirty_ratio
it returns 10, but I think with vm.dirty_background_ratio
it worked.
What should I do to set it, or maybe I'm attempting to read it wrong way? Thanks for help!
--EDIT-- /etc/sysctl.conf:
#
# /etc/sysctl.conf - Configuration file for setting system variables
# See /etc/sysctl.d/ for additional system variables.
# See sysctl.conf (5) for information.
#
#kernel.domainname = example.com
# Uncomment the following to stop low-level messages on console
#kernel.printk = 3 4 1 3
##############################################################3
# Functions previously found in netbase
#
# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
# Turn on Source Address Verification in all interfaces to
# prevent some spoofing attacks
#net.ipv4.conf.default.rp_filter=1
#net.ipv4.conf.all.rp_filter=1
# Uncomment the next line to enable TCP/IP SYN cookies
# See http://lwn.net/Articles/277146/
# Note: This may impact IPv6 TCP sessions too
#net.ipv4.tcp_syncookies=1
# Uncomment the next line to enable packet forwarding for IPv4
#net.ipv4.ip_forward=1
# Uncomment the next line to enable packet forwarding for IPv6
# Enabling this option disables Stateless Address Autoconfiguration
# based on Router Advertisements for this host
#net.ipv6.conf.all.forwarding=1
###################################################################
# Additional settings - these settings can improve the network
# security of the host and prevent against some network attacks
# including spoofing attacks and man in the middle attacks through
# redirection. Some network environments, however, require that these
# settings are disabled so review and enable them as needed.
#
# Do not accept ICMP redirects (prevent MITM attacks)
#net.ipv4.conf.all.accept_redirects = 0
#net.ipv6.conf.all.accept_redirects = 0
# _or_
# Accept ICMP redirects only for gateways listed in our default
# gateway list (enabled by default)
# net.ipv4.conf.all.secure_redirects = 1
#
# Do not send ICMP redirects (we are not a router)
#net.ipv4.conf.all.send_redirects = 0
#
# Do not accept IP source route packets (we are not a router)
#net.ipv4.conf.all.accept_source_route = 0
#net.ipv6.conf.all.accept_source_route = 0
#
# Log Martian Packets
#net.ipv4.conf.all.log_martians = 1
#
#My SSD tweaks
vm.swappiness = 5
vm.dirty_background_ratio = 5
vm.dirty_ratio = 60
Output of sudo free --human
, because I'm unable to post it in comment:
total used free shared buffers cached
Mem: 3,8G 3,4G 473M 102M 65M 935M
-/+ buffers/cache: 2,4G 1,4G
Swap: 3,9G 280K 3,9G
vm.swappiness
was working with spaces. I think spaces are allowed, but not when you want to do that from terminal.