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Thread: Ubuntu 9.04 Receives EXT4 Support

  1. #21
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    Jul 2008
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    Quote Originally Posted by d2kx View Post
    http://cdimage.ubuntu.com/kubuntu/daily-live/current/

    You could also wait for Alpha 3 which is arriving tomorrow, but tere shouldn't be any changes to this one really.
    It's called system updates....doing that would probably be faster than downloading, burning/making a USB boot drive, and installing Alpha 3 when you already have Alpha 2.

    Sillyfaces. :P

  2. #22

    Default xfs

    why haven't we been using xfs default?

  3. #23
    Join Date
    Dec 2008
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    Quote Originally Posted by broomfighter View Post
    why haven't we been using xfs default?
    It's tricky to use as a root FS, because you can only setup grub on it from the GRUB bootloader itself, not while running Linux with grub-install. (I keep a GRUB floppy image on a USB drive, that I can boot with syslinux's memdisk. I also have it on my PXE netboot server.)

    Also, XFS needs to be mounted with logbsize=256k to do well all around (at least on magnetic disks). However, putting that in /etc/fstab for the root fs doesn't do anything, because for the root fs it only does a mount -o remount to try to apply the options. So if only logbsize=256k was the default on systems with plenty of RAM... (with the default logbsize=32k, IIRC, you bottleneck on journaling metadata ops any time you write a lot of small files, e.g. extracting a tar). Be sure you use a recent xfsprogs, or manually specify lazy_count=1.

    Anyway, wow, ext4 does great on solid-state disks! I wonder what the bottlenecks are in the other filesystems... Maybe CPU usage on the Atom? I know XFS is not a small piece of code, and it's definitely tuned for massive SMP systems, but maybe not for systems with such a slow CPU, esp. relative to the I/O latency of a solid state disk.

  4. #24
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    Feb 2008
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    JFS has the lowest CPU usage of all journaling FS..

  5. #25
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    Jul 2008
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    I really like Ext4, very nice FS in comparison to Ext3, seems quite a lot faster. Conversion from Ext3 to 4 was easy and flawless. Rock on. ^^

  6. #26
    Join Date
    Aug 2009
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    The IOZone Write test result is rather strange... it's hard for me to believe that ext4 is 2x faster than the earlier ext2/3 versions. I wonder if delayed writes are playing havoc with the results?

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