Cifs slow read speed

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Hi,

I am running  a small Ceph Nautilus cluster on Ubuntu 18.04.

I am testing cluster to expose cephfs volume in samba v4 share for user to
access from windows.

When i do test with DD Write (600 MB/s) and md5sum file Read speed is (700
- 800 MB/s) from ceph kernel mount.

Same volume i have exposed in samba using "vfs_ceph" and mounted it thru
cifs in another ubuntu18.04 as client.
Now, when i perform DD write i get speed of 600 MB/s and md5sum of file
Read speed is only 65 MB/s.

What could be the problem? Any one faced similar issue?
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