1d1c3a389c
These modifiers can specify when to assign new value considering the old value. E.g.: readahead=>4096 means assign readahead 4096 only if the current value of readahaed is lower than 4096 (i.e. the readahaed will be at least 4096). Similarly for the < operator, it will assign the value only if the current value is higher. The modifiers are part of the value, not part of the equality operator, thus the following is correct: readahead= >4096 But the following isn't correct, but will probably also work due to the nature how the value is parsed: readahead=> 4096 Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
59 lines
2 KiB
Text
59 lines
2 KiB
Text
#
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# tuned configuration
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#
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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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[vm]
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transparent_hugepages=always
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[disk]
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readahead=>4096
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[sysctl]
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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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kernel.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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kernel.sched_wakeup_granularity_ns = 15000000
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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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