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# # tuned configuration # [main] summary=Broadly applicable tuning that provides excellent performance across a variety of common server workloads [cpu] governor=performance energy_perf_bias=performance min_perf_pct=100 [disk] # The default unit for readahead is KiB. This can be adjusted to sectors # by specifying the relevant suffix, eg. (readahead => 8192 s). There must # be at least one space between the number and suffix (if suffix is specified). readahead=>4096 [sysctl] # ktune sysctl settings for rhel6 servers, maximizing i/o throughput # # Minimal preemption granularity for CPU-bound tasks: # (default: 1 msec# (1 + ilog(ncpus)), units: nanoseconds) kernel.sched_min_granularity_ns = 10000000 # SCHED_OTHER wake-up granularity. # (default: 1 msec# (1 + ilog(ncpus)), units: nanoseconds) # # This option delays the preemption effects of decoupled workloads # and reduces their over-scheduling. Synchronous workloads will still # have immediate wakeup/sleep latencies. kernel.sched_wakeup_granularity_ns = 15000000 # If a workload mostly uses anonymous memory and it hits this limit, the entire # working set is buffered for I/O, and any more write buffering would require # swapping, so it's time to throttle writes until I/O can catch up. Workloads # that mostly use file mappings may be able to use even higher values. # # The generator of dirty data starts writeback at this percentage (system default # is 20%) vm.dirty_ratio = 40 # Start background writeback (via writeback threads) at this percentage (system # default is 10%) vm.dirty_background_ratio = 10 # PID allocation wrap value. When the kernel's next PID value # reaches this value, it wraps back to a minimum PID value. # PIDs of value pid_max or larger are not allocated. # # A suggested value for pid_max is 1024 * <# of cpu cores/threads in system> # e.g., a box with 32 cpus, the default of 32768 is reasonable, for 64 cpus, # 65536, for 4096 cpus, 4194304 (which is the upper limit possible). #kernel.pid_max = 65536 # The swappiness parameter controls the tendency of the kernel to move # processes out of physical memory and onto the swap disk. # 0 tells the kernel to avoid swapping processes out of physical memory # for as long as possible # 100 tells the kernel to aggressively swap processes out of physical memory # and move them to swap cache vm.swappiness=10