On Thu, 22 Nov 2018 22:07:25 +0900 Tomasz Chmielewski <tch@xxxxxxxxxxx> wrote: > Spot on! > > Removed "discard" from fstab and added "ssd", rebooted - no more > btrfs-cleaner running. Recently there has been a bugfix for TRIM in Btrfs: btrfs: Ensure btrfs_trim_fs can trim the whole fs https://patchwork.kernel.org/patch/10579539/ Perhaps your upgraded kernel is the first one to contain it, and for the first time you're seeing TRIM to actually *work*, with the actual performance impact of it on a large fragmented FS, instead of a few contiguous unallocated areas. -- With respect, Roman
