#

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# tuned configuration

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#

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[main]

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summary=Optimize for deterministic performance at the cost of increased power consumption

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[cpu]

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force_latency=cstate.id_no_zero:1|3

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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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[acpi]

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platform_profile=performance

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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=10

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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=3

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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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[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 = 3000000

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sched_wakeup_granularity_ns = 4000000

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# The total time the scheduler will consider a migrated process

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# "cache hot" and thus less likely to be re-migrated

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# (system default is 500000, i.e. 0.5 ms)

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sched_migration_cost_ns = 5000000

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