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无法使用 /etc/sysctl.conf 更改 vm.dirty_ratio

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无法使用 /etc/sysctl.conf 更改 vm.dirty_ratio

我最近买了一个 120GB 的 SSD 硬盘，想用它来调整我的操作系统。我发现了一些教程我这样做了，并遵循了它，但发现了一些问题。

我想将值更改为 60，因此我在末尾vm.dirty_ratio添加了此行：。然后我重新启动计算机以应用更改。vm.dirty_ratio = 60/etc/sysctl.conf

现在当我使用sysctl vm.dirty_ratio它时它会返回 10，但我认为vm.dirty_background_ratio它有效。

我该如何设置它，或者我可能以错误的方式读取它？谢谢帮助！

--编辑-- /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

的输出sudo free --human，因为我无法将其发布在评论中：

             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

答案1

答案2

根据最后一条评论：vm.dirty_ratio只是缓冲要以更大的块写入的页面，因此对您的 SSD 生命周期并不重要（我的标准是 10）。fstab中的noatime和discard选项（仅当您的磁盘支持 trim 时才使用后者）对于保持较低的写入次数更有用。

我也为我的 SSD 磁盘实现了data=writeback此功能fstab，但只有当你在配有 UPS 的 PC 上运行时（或有带可用电池的笔记本电脑）才能这样做

fstab另外：在更改任何内容之前，请务必制作备份！

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