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You can actually tune some VFS parameters to make it less likely to evict the VFS caches (vfs_cache_pressure), however, it's not well documented which settings work the best other than to set it to '1' for 'mostly don't' which mostly works well only if you have way more RAM than you need and will tend to go quite badly if that is not the case. I think the only way to determine that well would be to benchmark it for your specific use case. But it may help you over a recurring "ls -R"



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