252bd91ed0
In the kernel table of exit latencies of various CPUs the worst exit latency for C1 seems to be 3 us, so increase the backup value latency requirement to 3 us to match the worst C1 exit latency. Related: rhbz#1737628 Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
45 lines
1.5 KiB
Text
45 lines
1.5 KiB
Text
#
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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: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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[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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# 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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# 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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kernel.sched_migration_cost_ns=5000000
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