set mds message priority to MSG_PRIO_HIGH

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Hi, 
I'm testing ceph with samba.
I have 20 OSD nodes on 4 hosts
dy01:1MON, 5 OSDs, 1 samba server
dy02: 1MDS, 5OSDs, 1 samba server
dy03: 5 OSDs, 1 samba server
dy04:5 OSDs, 1 samba server
every samba server exports the ceph kclient mount point.

When I set 3 samba clients connect to a samba server(dy01), and each write a
single 18GB file, gets 110MB/s speed each.
But when I use 4 clients, the cluster will report 'slow request' msg, and
this time I list files in samba client dir, it gets stuck.
And the test tool reports frame losing.
For the list operation related to MDS, I think the MDS op messages should
have higher priority than clients op.
Have I understood correctly? 

thanks


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