#

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# tuned configuration

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#

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[main]

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summary=Broadly applicable tuning that provides excellent performance across a variety of common server workloads

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[variables]

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thunderx_cpuinfo_regex=CPU part\s+:\s+(0x0?516)|(0x0?af)|(0x0?a[0-3])|(0x0?b8)\b

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amd_cpuinfo_regex=model name\s+:.*\bAMD\b

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[cpu]

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governor=performance

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energy_perf_bias=performance

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min_perf_pct=100

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energy_performance_preference=performance

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[acpi]

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platform_profile=performance

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# Marvell ThunderX

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[vm.thunderx]

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type=vm

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uname_regex=aarch64

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cpuinfo_regex=${thunderx_cpuinfo_regex}

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transparent_hugepages=never

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[disk]

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# The default unit for readahead is KiB. This can be adjusted to sectors

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# by specifying the relevant suffix, eg. (readahead => 8192 s). There must

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# be at least one space between the number and suffix (if suffix is specified).

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readahead=>4096

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[sysctl]

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# If a workload mostly uses anonymous memory and it hits this limit, the entire

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# working set is buffered for I/O, and any more write buffering would require

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# swapping, so it's time to throttle writes until I/O can catch up. Workloads

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# that mostly use file mappings may be able to use even higher values.

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#

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# The generator of dirty data starts writeback at this percentage (system default

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# is 20%)

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vm.dirty_ratio = 40

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# Start background writeback (via writeback threads) at this percentage (system

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# default is 10%)

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vm.dirty_background_ratio = 10

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# PID allocation wrap value. When the kernel's next PID value

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# reaches this value, it wraps back to a minimum PID value.

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# PIDs of value pid_max or larger are not allocated.

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#

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# A suggested value for pid_max is 1024 * <# of cpu cores/threads in system>

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# e.g., a box with 32 cpus, the default of 32768 is reasonable, for 64 cpus,

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# 65536, for 4096 cpus, 4194304 (which is the upper limit possible).

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#kernel.pid_max = 65536

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# The swappiness parameter controls the tendency of the kernel to move

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# processes out of physical memory and onto the swap disk.

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# 0 tells the kernel to avoid swapping processes out of physical memory

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# for as long as possible

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# 100 tells the kernel to aggressively swap processes out of physical memory

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# and move them to swap cache

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vm.swappiness=10

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# The default kernel value 128 was over twenty years old default,

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# kernel-5.4 increased it to 4096, thus do not have it lower than 2048

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# on older kernels

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net.core.somaxconn=>2048

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[scheduler]

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runtime=0

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# ktune sysctl settings for rhel6 servers, maximizing i/o throughput

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#

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# Minimal preemption granularity for CPU-bound tasks:

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# (default: 1 msec# (1 + ilog(ncpus)), units: nanoseconds)

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sched_min_granularity_ns = 10000000

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# SCHED_OTHER wake-up granularity.

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# (default: 1 msec# (1 + ilog(ncpus)), units: nanoseconds)

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#

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# This option delays the preemption effects of decoupled workloads

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# and reduces their over-scheduling. Synchronous workloads will still

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# have immediate wakeup/sleep latencies.

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sched_wakeup_granularity_ns = 15000000

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# Marvell ThunderX

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[sysctl.thunderx]

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type=sysctl

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uname_regex=aarch64

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cpuinfo_regex=${thunderx_cpuinfo_regex}

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kernel.numa_balancing=0

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# AMD

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[scheduler.amd]

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type=scheduler

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uname_regex=x86_64

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cpuinfo_regex=${amd_cpuinfo_regex}

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runtime=0

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sched_migration_cost_ns=5000000

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