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/proc/sys/net/ipv4/tcp_sack - TCP Selective Acknowledgements. They can reduce retransmissions, however make servers more prone to DDo S Attacks and increase CPU utilization./proc/sys/net/ipv4/tcp_window_scaling - support for large TCP Windows (RFC 1323).
Keep in mind everything under /proc is volatile, so any changes you make are lost after reboot.The TCP/IP parameters for tweaking a Linux-based machine for fast internet connections are located in /proc/sys/net/... This location is volatile, and changes are reset at reboot.There are a couple of methods for reapplying the changes at boot time, ilustrated below.All TCP/IP tunning parameters are located under /proc/sys/net/...For example, here is a list of the most important tunning parameters, along with short description of their meaning:/proc/sys/net/core/rmem_max - Maximum TCP Receive Window /proc/sys/net/core/wmem_max - Maximum TCP Send Window /proc/sys/net/ipv4/tcp_rmem - memory reserved for TCP receive buffers /proc/sys/net/ipv4/tcp_wmem - memory reserved for TCP send buffers /proc/sys/net/ipv4/tcp_timestamps - Timestamps (RFC 1323) add 12 bytes to the TCP header...There are some additional internal memory buffers for the TCP Window, allocated for each connection:/proc/sys/net/ipv4/tcp_rmem - memory reserved for TCP rcv buffers (reserved memory per connection default)/proc/sys/net/ipv4/tcp_wmem - memory reserved for TCP snd buffers (reserved memory per connection default)The tcp_rmem and tcp_wmem contain arrays of three parameter values: the 3 numbers represent minimum, default and maximum memory values.
Those 3 values are used to bound autotunning and balance memory usage while under global memory stress.
TCP/IP parameters in Linux are located in /proc/sys/net/ipv4 and /proc/sys/net/core .
This is part of the Virtual filesystem which resides in system memory (RAM), and any changes to it are volatile, they are reset when the machine is rebooted.
There are two methods that we can use to apply the settings at each reboot.
First, we can edit /etc/(or /etc/sysctl.d/sysctl.conf, depending on your distribution).
The syntax for setting parameters in this file is by issuing sysctl commands, as follows::rmem_default = 256960rmem_max = 256960wmem_default = 256960wmem_max = 256960net.ipv4.tcp_timestamps = 0net.ipv4.tcp_sack = 0net.ipv4.tcp_window_scaling = 1You can see a list of all tweakable parameters by executing the following in your terminal: for a full list).