From: Farley Flud <ff@linux.rocks>
Subject: Linux Performance Tuning
Newsgroups: comp.os.linux.advocacy
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Date: Sun, 11 Aug 2024 11:42:43 +0000
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Don't ever accept defaults.  Always tune your machine.

Beyond build configuration, there is the possibility of
run-time tuning via "sysctl:"

man sysctl

Do a search for "linux kernel performance tuning" and
plenty of info will be available.

Here is my sysctl.conf:

# disable ASLR security bullshit
kernel.randomize_va_space=0
# aggressive network settings
net.core.netdev_max_backlog = 65536
net.core.optmem_max = 65536
net.core.rmem_default = 1048576
net.core.wmem_default = 1048576
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.tcp_timestamps = 0 
net.ipv4.tcp_sack = 1 
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_no_metrics_save = 1
#To disable IP source routing (SRR), so that nobody can tell us which path a packet should take:
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
#By default, routers route everything and even packages which don't belong
#to their network(s). To avoid that we've to make sure strict reverse path filtering is enabled as defined in RFC3704:
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_mtu_probing = 1
#
vm.dirty_ratio = 10
vm.dirty_background_ratio = 5