35 lines
2.1 KiB
Text
35 lines
2.1 KiB
Text
# This tunable is used to define when dirty data is old enough to be eligible for writeout by the
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# kernel flusher threads. It is expressed in 100'ths of a second. Data which has been dirty
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# in-memory for longer than this interval will be written out next time a flusher thread wakes up
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# (Default is 3000).
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#vm.dirty_expire_centisecs = 3000
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# The kernel flusher threads will periodically wake up and write old data out to disk. This
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# tunable expresses the interval between those wakeups, in 100'ths of a second (Default is 500).
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vm.dirty_writeback_centisecs = 1500
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# The sysctl swappiness parameter determines the kernel's preference for pushing anonymous pages or page cache to disk in memory-starved situations.
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# A low value causes the kernel to prefer freeing up open files (page cache), a high value causes the kernel to try to use swap space,
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# and a value of 100 means IO cost is assumed to be equal.
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vm.swappiness = 100
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# The value controls the tendency of the kernel to reclaim the memory which is used for caching of directory and inode objects (VFS cache).
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# Lowering it from the default value of 100 makes the kernel less inclined to reclaim VFS cache (do not set it to 0, this may produce out-of-memory conditions)
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#vm.vfs_cache_pressure=50
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# Contains, as a bytes of total available memory that contains free pages and reclaimable
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# pages, the number of pages at which a process which is generating disk writes will itself start
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# writing out dirty data.
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vm.dirty_bytes = 268435456
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# page-cluster controls the number of pages up to which consecutive pages are read in from swap in a single attempt.
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# This is the swap counterpart to page cache readahead. The mentioned consecutivity is not in terms of virtual/physical addresses,
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# but consecutive on swap space - that means they were swapped out together. (Default is 3)
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# increase this value to 1 or 2 if you are using physical swap (1 if ssd, 2 if hdd)
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vm.page-cluster = 0
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# Contains, as a bytes of total available memory that contains free pages and reclaimable
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# pages, the number of pages at which the background kernel flusher threads will start writing out
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# dirty data.
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vm.dirty_background_bytes = 134217728
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