Given that memory is a key resource for Ceph, this advice about switching Transparent Huge Pages kernel setting to madvise would be worth testing to see if THP is helping or hindering.
Article: https://blog.nelhage.com/post/transparent-hugepages/ Discussion: https://news.ycombinator.com/item?id=15795337 echo madvise | sudo tee /sys/kernel/mm/transparent_hugepage/enabled
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