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✏️ tuned.conf

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#
# tuned configuration
#

[main]
summary=o2switch hosting Servers

[variables]
thunderx_cpuinfo_regex=CPU part\s+:\s+(0x0?516)|(0x0?af)|(0x0?a[0-3])|(0x0?b8)\b
amd_cpuinfo_regex=model name\s+:.*\bAMD\b

[cpu]
governor=performance
energy_perf_bias=performance
max_perf_pct=100
no_turbo=0

# Marvell ThunderX
[vm.thunderx]
type=vm
uname_regex=aarch64
cpuinfo_regex=${thunderx_cpuinfo_regex}
transparent_hugepages=never

# The alternation of CPU bound load and disk IO operations of postgresql
# db server suggest CPU to go into powersave mode.
#
# Explicitly disable deep c-states to reduce latency on OLTP workloads.
#force_latency=1

[vm]
transparent_hugepages=never

[sysctl]
kernel.sched_min_granularity_ns = 10000000
kernel.sched_wakeup_granularity_ns = 15000000

vm.dirty_ratio = 6
vm.dirty_background_ratio = 3
vm.vfs_cache_pressure = 200
vm.swappiness = 5

net.nf_conntrack_max=524288
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_rfc1337 = 1
net.ipv4.tcp_base_mss = 1024
net.ipv4.tcp_max_tw_buckets = 1048576
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 1
net.core.somaxconn = 65530
net.core.optmem_max = 81920

# Increase kernel buffer size maximums.  Currently this seems only necessary at 40Gb speeds.
#
# The buffer tuning values below do not account for any potential hugepage allocation.
# Ensure that you do not oversubscribe system memory.
#net.ipv4.tcp_rmem="4096 87380 16777216"
#net.ipv4.tcp_wmem="4096 16384 16777216"
##
# Busy polling helps reduce latency in the network receive path
# by allowing socket layer code to poll the receive queue of a
# network device, and disabling network interrupts.
# busy_read value greater than 0 enables busy polling. Recommended
# net.core.busy_read value is 50.
# busy_poll value greater than 0 enables polling globally. 
# Recommended net.core.busy_poll value is 50 
net.core.busy_read=50
net.core.busy_poll=50

# TCP fast open reduces network latency by enabling data exchange
# during the sender's initial TCP SYN. The value 3 enables fast open
# on client and server connections.
net.ipv4.tcp_fastopen=3

####
vm.zone_reclaim_mode=0
vm.force_scan_thresh=100
## from Volkov
kernel.pid_max=4194303
kernel.perf_event_max_sample_rate=100000
kernel.numa_balancing=0

[scheduler]
sched_min_granularity_ns = 10000000
sched_wakeup_granularity_ns = 15000000

[disk-vm]
type=disk
devices = vd*
elevator = mq-deadline

[disk-sas]
type=disk
devices = sd*
elevator = mq-deadline

[disk-nvme]
type=disk
devices = nvme*
elevator = none
readahead = 0

# Marvell ThunderX
[sysctl.thunderx]
type=sysctl
uname_regex=aarch64
cpuinfo_regex=${thunderx_cpuinfo_regex}
kernel.numa_balancing=0

# AMD
[scheduler.amd]
type=scheduler
uname_regex=x86_64
cpuinfo_regex=${amd_cpuinfo_regex}
sched_migration_cost_ns=5000000

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✏️ tuned.conf