On Thu, Dec 8, 2016 at 8:11 AM, Swâmi Petaramesh <sw...@petaramesh.org> wrote:

> Well, the damn thing has been running for 15 days uninterrupted !
> ...Until I [Ctrl]-C it this morning as I had to move with the machine (I
> wasn't expecting it to last THAT long...).

Can you check some bigger files and see if they've become fragmented?
I'm seeing 1.4GiB files with 2-3 extents reported by filefrag, go to
over 5000 fragments during dedupe. This is not something I recall
happening some months ago.

I inadvertently replied to the wrong dedupe thread about my test and
what I'm finding, it's here.
https://www.spinics.net/lists/linux-btrfs/msg61304.html

But if you're seeing something similar, then it would explain why it's
so slow in your case.

-- 
Chris Murphy
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