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    No; those cause the kernel to write dirty pages to disk more frequently, but not to remove clean ones from the cache. You want vm.swappiness set to zero. Commented Sep 29, 2015 at 14:37
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    I have already tried this stuff but even after doing this and dropping the cache i.e. echo 3 >> /proc/sys/vm/drop_caches still in cache there remain around 180 MB is there any way to reduce the cache size further? Commented Sep 30, 2015 at 9:29