jewel 10.2.5 cephfs fsync write issue

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hi guys:

I am using kernel client (4.9) to mount cephfs (10.2.5) that just upgraded from Hammer(0.94.9).

It became slow while doing fsync write  VS  same process in Hammer.
(Yes, I am sure, fsync is the key.)


1. anyone knows what's goning on ?
2. any way to import that?

=======================================
btw, actually, It's the same slow if I deploy a new cluster, with kernel client 4.2 or fuse client. ~




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