External/sysctl
1
0
Fork 0
mirror of https://github.com/k4yt3x/sysctl.git synced 2025-12-24 05:07:11 +00:00
Code Issues Packages Projects Releases Wiki Activity

feat: optimized socket buffer size limits

Browse Source 
https://blog.cloudflare.com/optimizing-tcp-for-high-throughput-and-low-latency
Updated some comments.

Signed-off-by: k4yt3x <i@k4yt3x.com>
This commit is contained in:
k4yt3x 2024-07-15 00:00:00 +00:00
parent 1d2f9f784d
commit 9f621a7259
No known key found for this signature in database
1 changed files with 21 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
sysctl.conf
View File

@ -1,19 +1,19 @@
# Name: K4YT3X Hardened sysctl Configuration
# Name: K4YT3X's Hardened & Optimized Linux Kernel Parameters
# Author: K4YT3X
# Contributor: IceCodeNew
# Contributor: HorlogeSkynet
# Contributor: shenzhui007
# Date Created: October 5, 2020
# Last Updated: May 2, 2024
# Last Updated: July 14, 2024
# Licensed under the GNU General Public License Version 3 (GNU GPL v3),
# available at: https://www.gnu.org/licenses/gpl-3.0.txt
# (C) 2020-2024 K4YT3X
# Multiple sources have been consulted while writing this configuration
# file (e.g., nixCraft's sysctl.conf). Sources are not cited since this
# is not an academic document. Please refer to Linux documentations
# should you have any questions.
# file (e.g., nixCraft's sysctl.conf). Some sources may not have been cited.
# Please refer to Linux's kernel documentations or reach out to the author
# should you have any questions or recommendations.
########## Kernel ##########
@ -144,12 +144,12 @@ net.core.netdev_max_backlog = 250000
# this trades off performance, but can mitigate JIT spraying
net.core.bpf_jit_harden = 2
# increase TCP max buffer size setable using setsockopt()
net.core.rmem_max = 8388608
net.core.wmem_max = 8388608
# increase TCP max buffer size settable using setsockopt()
net.core.rmem_default = 8388608
net.core.wmem_default = 8388608
#net.core.optmem_max = 40960
net.core.rmem_max = 536870912
net.core.wmem_max = 536870912
net.core.optmem_max = 40960
########## IPv4 Networking ##########
@ -238,14 +238,12 @@ net.ipv4.ip_local_port_range = 1024 65535
net.ipv4.tcp_timestamps = 0
# enabling SACK can increase the throughput
# but SACK is commonly exploited and rarely used
# but SACK is commonly exploited and rarely used
# re-enable this if you experience issues transferring large files over SMB
net.ipv4.tcp_sack = 0
net.ipv4.tcp_dsack = 0
net.ipv4.tcp_fack = 0
# divide socket buffer evenly between TCP window size and application
net.ipv4.tcp_adv_win_scale = 1
# SSR could impact TCP's performance on a fixed-speed network (e.g., wired)
# but it could be helpful on a variable-speed network (e.g., LTE)
# uncomment this if you are on a fixed-speed network
@ -257,8 +255,16 @@ net.ipv4.tcp_mtu_probing = 1
net.ipv4.tcp_base_mss = 1024
# increase memory thresholds to prevent packet dropping
net.ipv4.tcp_rmem = 4096 87380 8388608
net.ipv4.tcp_wmem = 4096 87380 8388608
# the maximum buffer size is 536870912 bytes (512 MiB)
net.ipv4.tcp_rmem = 8192 262144 536870912
net.ipv4.tcp_wmem = 4096 16384 536870912
# reduce the maximum window size to 128 MiB to reduce TCP receive queue collapse
# (see https://blog.cloudflare.com/optimizing-tcp-for-high-throughput-and-low-latency)
net.ipv4.tcp_adv_win_scale = -2
# limit the size of unsent bytes in the write queue to prevent bufferbloat
net.ipv4.tcp_notsent_lowat = 131072
########## IPv6 Networking ##########