23.06.2019 14:29, Qu Wenruo пишет: > > > BTW, so many fragmented extents, this normally means your system has > very high memory pressure or lack of memory, or lack of on-disk space. It is 1GiB QEMU VM with vanilla Tumbleweed with GNOME desktop; nothing runs except user GNOME session. Does it fit "high memory pressure" definition? > Above 100MiB should be in one large extent, not split into so many small > ones. > OK, so this is where I was confused. I was sure that filefrag returns true "physical" extent layout. It seems that in filefrag output consecutive extents are merged giving false picture of large extent instead of many small ones. Filefrag shows 5 ~200MiB extents, not over 30 smaller ones. Is it how generic IOCTL is designed to work or is it something that btrfs does internally? This *is* confusing. In any case, thank you for clarification, this makes sense now.
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