Struggling with file system slowness

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Hi All,

Trying to peg down why I have one server that has btrfs-transacti pegged at 100% CPU for most of the time.

I thought this might have to do with fragmentation as mentioned in the Gotchas page in the wiki (btrfs-endio-wri doesn't seem to be involved as mentioned in the wiki), but after running a full defrag of the file system, and also enabling the 'autodefrag' mount option, the problem still persists.

What's the best way to figure out what btrfs is chugging away at here?

Kernel: 4.10.13-custom
btrfs-progs: v4.10.2


-Matt
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