Re: [gentoo-user] Re: File system defragmentation. Something that can resume after stopping.

From	Michael <confabulate@kintzios.com>
Newsgroups	linux.gentoo.user
Subject	Re: [gentoo-user] Re: File system defragmentation. Something that can resume after stopping.
Date	2026-05-14 19:40 +0200
Message-ID	<MUIcp-57ON-15@gated-at.bofh.it> (permalink)
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On Thursday, 14 May 2026 17:18:39 British Summer Time Holger Hoffstätte 
wrote:
> On 2026-05-14 12:30, Michael wrote:
> > There's this archived paper from a 2007 Linux Symposium which
> > explains how linux filesystems intelligently delay writing data to
> > disk until the last moment so that data is allocated as
> > contiguously as possible.  Also, after a
> That (delalloc) is unfortunately not even half the story. XFS is still
> the only filesystem (on Linux) that does persistent preallocation on
> regular writes, and splitting the filesystem into multiple AGs
> (allocation groups) is much more effective for *long-term* mixed-size
> free-space management than whatever ext4 does even today.
> 
> So while we're posting papers:
> https://www.usenix.org/conference/hotstorage19/presentation/conway
> 
> Enjoy :)
> 
> -h

Thank you for this!  I was surprised to read BTRFS was tested to be 
better than ext4 and ZFS on HDD and better than ext4, XFS and F2FS on an 
SSD.  O_O

Does anyone know if kernel fscrypt has been added to btrfs following 
this work?

https://lore.kernel.org/linux-btrfs/
20240124195831.GA1212739@perftesting/T/

I don't see this included in CONFIG_BTRFS_EXPERIMENTAL on the stable 
kernel.

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[gentoo-user] File system defragmentation. Something that can resume  after stopping. Dale <rdalek1967@gmail.com> - 2026-05-13 00:50 +0200
  Re: [gentoo-user] File system defragmentation. Something that can  resume after stopping. Jack <ostroffjh@users.sourceforge.net> - 2026-05-13 01:10 +0200
    Re: [gentoo-user] File system defragmentation. Something that can  resume after stopping. Dale <rdalek1967@gmail.com> - 2026-05-13 04:30 +0200
    Re: [gentoo-user] File system defragmentation. Something that can resume  after stopping. Michael <confabulate@kintzios.com> - 2026-05-13 12:50 +0200
    Re: [gentoo-user] File system defragmentation. Something that can  resume after stopping. Dale <rdalek1967@gmail.com> - 2026-05-13 13:40 +0200
        Re: [gentoo-user] File system defragmentation. Something that can resume  after stopping. Michael <confabulate@kintzios.com> - 2026-05-13 14:10 +0200
        Re: [gentoo-user] File system defragmentation. Something that can  resume after stopping. Dale <rdalek1967@gmail.com> - 2026-05-13 18:00 +0200
          Re: [gentoo-user] File system defragmentation. Something that can  resume after stopping. Alan Mackenzie <acm@muc.de> - 2026-05-13 18:50 +0200
            Re: [gentoo-user] File system defragmentation. Something that can  resume after stopping. Dale <rdalek1967@gmail.com> - 2026-05-13 20:20 +0200
              Re: [gentoo-user] File system defragmentation. Something that can  resume after stopping. Dale <rdalek1967@gmail.com> - 2026-05-14 00:10 +0200
                  Re: [gentoo-user] File system defragmentation. Something that can resume  after stopping. Michael <confabulate@kintzios.com> - 2026-05-14 12:40 +0200
                [gentoo-user] Re: File system defragmentation. Something that can resume after stopping. Holger Hoffstätte <holger@applied-asynchrony.com> - 2026-05-14 18:20 +0200
                  Re: [gentoo-user] Re: File system defragmentation. Something that can resume  after stopping. Michael <confabulate@kintzios.com> - 2026-05-14 19:40 +0200
                Re: [gentoo-user] File system defragmentation. Something that can  resume after stopping. Dale <rdalek1967@gmail.com> - 2026-05-14 19:10 +0200
                Re: [gentoo-user] File system defragmentation. Something that can  resume after stopping. Dale <rdalek1967@gmail.com> - 2026-05-15 21:40 +0200
                Re: [gentoo-user] File system defragmentation. Something that can  resume after stopping. Dale <rdalek1967@gmail.com> - 2026-05-17 23:30 +0200
                Re: [gentoo-user] File system defragmentation. Something that can  resume after stopping. Mitchell Dorrell <mwd@psc.edu> - 2026-05-14 19:50 +0200

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