I found that dropping dentries and inode caches with
sudo su -c 'echo 2 > /proc/sys/vm/drop_caches'
is helpful to avoid performance degradation if given before each tree walk
probably because it drops nfs_inode_cache.
However I don't understand why dropping pagecache by
sudo su -c 'echo 1 > /proc/sys/vm/drop_caches'
helps in this situation as well...
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