On Sun, Jun 28, 2020 at 9:04 AM <[email protected]> wrote:
>
> >(if Alexandre is willing to do some further
> >testing to put numbers on the problem)?
>
> I'm willing to perform further testing.

Do you recall what mount options you were using? In particular this
sounds like a side effect of using the discard mount option with
certain SSDs. This is a significant motivation of the new
discard=async mount option for btrfs since kernel 5.6.

Each file system's discard behavior is different. XFS has gone through
a few iterations.


-- 
Chris Murphy
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