hi，
I upgraded CEPH to 0.87 for rbd readahead , but can't see any performance improvement in 4K seq read in the VM.
How can I know if the readahead is take effect?
thanks.
ceph.conf
[client]
rbd_cache = true
rbd_cache_size = 335544320
rbd_cache_max_dirty = 251658240
rbd_cache_target_dirty = 167772160
rbd readahead trigger requests = 1
rbd readahead max bytes = 4194304
rbd readahead disable after bytes = 0
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