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Thread: Knoppix 8.1 flash persistent image seems really slow

  1. #1
    Member registered user
    Join Date
    Apr 2007
    Posts
    68

    Knoppix 8.1 flash persistent image seems really slow

    Hi all,

    I was working with a flash install of knoppix and it seems really slow, much slower than I would expect.

    so I run a command like dpkg on knoppix running without any persistent image (just using the ram of the system) and it goes instantly.

    Code:
    time sudo dpkg -i mame_0.186-dmo1_i386.deb mame-data_0.186-dmo1_all.deb 
    Selecting previously unselected package mame.
    (Reading database ... 449729 files and directories currently installed.)
    Preparing to unpack .../mame_0.186-dmo1_i386.deb ...
    Unpacking mame (1:0.186-dmo1) ...
    Selecting previously unselected package mame-data.
    Preparing to unpack .../mame-data_0.186-dmo1_all.deb ...
    Unpacking mame-data (1:0.186-dmo1) ...
    Setting up mame-data (1:0.186-dmo1) ...
    Setting up mame (1:0.186-dmo1) ...
    Processing triggers for man-db (2.7.6.1-2) ...
    Processing triggers for menu (2.1.47+b1) ...
    
    real    0m13.315s
    user    0m6.271s
    sys    0m5.182s
    If I run with a persistent hard drive image, I get snappy results also.

    However, when I use a flash drive it's a different story.

    Running the same command under a persistent flash drive it takes forever...

    Code:
    time sudo dpkg -i mame-data_0.189+dfsg.1-1_all.deb mame_0.189+dfsg.1-1_i386.deb 
    Selecting previously unselected package mame-data.
    (Reading database ... 449729 files and directories currently installed.)
    Preparing to unpack .../mame-data_0.189+dfsg.1-1_all.deb ...
    Unpacking mame-data (0.189+dfsg.1-1) ...
    Selecting previously unselected package mame.
    Preparing to unpack .../mame_0.189+dfsg.1-1_i386.deb ...
    Unpacking mame (0.189+dfsg.1-1) ...
    Setting up mame-data (0.189+dfsg.1-1) ...
    Setting up mame (0.189+dfsg.1-1) ...
    Processing triggers for desktop-file-utils (0.23-2) ...
    Processing triggers for gnome-menus (3.13.3-9) ...
    Processing triggers for mime-support (3.60) ...
    Processing triggers for hicolor-icon-theme (0.17-1) ...
    Processing triggers for man-db (2.7.6.1-2) ...
    
    real    6m23.851s
    user    0m8.202s
    sys    0m6.430s

    Why is flash so slow? I wouldn't expect it to take multiple minutes to do these things. 6 minutes seems like an eternity.

    Is it because it wants to journalize everything with reiserfs?

  2. #2
    Member registered user
    Join Date
    Apr 2007
    Posts
    68
    Just for comparison, here's the same operation using a hard drive persistent installation (fat32 with fat32 overlay file)

    Code:
    knoppix@Microknoppix:~$ time sudo dpkg -i mame_0.186-dmo1_i386.deb mame-data_0.186-dmo1_all.deb
    Selecting previously unselected package mame.
    (Reading database ... 449729 files and directories currently installed.)
    Preparing to unpack .../mame_0.186-dmo1_i386.deb ...
    Unpacking mame (1:0.186-dmo1) ...
    Selecting previously unselected package mame-data.
    Preparing to unpack .../mame-data_0.186-dmo1_all.deb ...
    Unpacking mame-data (1:0.186-dmo1) ...
    Setting up mame-data (1:0.186-dmo1) ...
    Setting up mame (1:0.186-dmo1) ...
    Processing triggers for man-db (2.7.6.1-2) ...
    Processing triggers for menu (2.1.47+b1) ...
    
    real    0m20.650s
    user    0m6.294s
    sys    0m5.537s

  3. #3
    Member registered user
    Join Date
    Apr 2007
    Posts
    68
    Okay, I thought I'd try this again, I bought two identical PNY Turbo Attache 4 USB 3.0 16GB flash drives, one is formatted with reiserfs overlay partition and the other is fat32 overlay file,

    So let's do the same operation:

    The reiserfs partition overlay:

    Code:
    knoppix@Microknoppix:~$ time sudo dpkg -i mamepackages/mame_0.189+dfsg.1-1_i386.deb mamepackages/mame-data_0.189+dfsg.1-1_all.deb 
    dpkg: warning: downgrading mame from 1:0.186-dmo1 to 0.189+dfsg.1-1
    (Reading database ... 451601 files and directories currently installed.)
    Preparing to unpack .../mame_0.189+dfsg.1-1_i386.deb ...
    Unpacking mame (0.189+dfsg.1-1) over (1:0.186-dmo1) ...
    dpkg: warning: downgrading mame-data from 1:0.186-dmo1 to 0.189+dfsg.1-1
    Preparing to unpack .../mame-data_0.189+dfsg.1-1_all.deb ...
    Unpacking mame-data (0.189+dfsg.1-1) over (1:0.186-dmo1) ...
    Setting up mame-data (0.189+dfsg.1-1) ...
    Setting up mame (0.189+dfsg.1-1) ...
    Installing new version of config file /etc/mame/presets/gameboy.ini ...
    Installing new version of config file /etc/mame/presets/gba.ini ...
    Installing new version of config file /etc/mame/presets/lcd-matrix.ini ...
    Installing new version of config file /etc/mame/presets/lcd.ini ...
    Installing new version of config file /etc/mame/presets/raster.ini ...
    Installing new version of config file /etc/mame/presets/vector-mono.ini ...
    Installing new version of config file /etc/mame/presets/vector.ini ...
    Processing triggers for desktop-file-utils (0.23-2) ...
    Processing triggers for gnome-menus (3.13.3-9) ...
    Processing triggers for mime-support (3.60) ...
    Processing triggers for hicolor-icon-theme (0.17-1) ...
    Processing triggers for man-db (2.7.6.1-2) ...
    Processing triggers for menu (2.1.47+b1) ...
    
    real    18m34.462s
    user    0m9.199s
    sys    0m7.050s
    knoppix@Microknoppix:~$ time sudo dpkg -i mamepackages/mame_0.186-dmo1_i386.deb mamepackages/mame-data_0.186-dmo1_all.deb 
    (Reading database ... 451579 files and directories currently installed.)
    Preparing to unpack .../mame_0.186-dmo1_i386.deb ...
    Unpacking mame (1:0.186-dmo1) over (0.189+dfsg.1-1) ...
    Preparing to unpack .../mame-data_0.186-dmo1_all.deb ...
    Unpacking mame-data (1:0.186-dmo1) over (0.189+dfsg.1-1) ...
    Setting up mame-data (1:0.186-dmo1) ...
    Setting up mame (1:0.186-dmo1) ...
    Installing new version of config file /etc/mame/presets/gameboy.ini ...
    Installing new version of config file /etc/mame/presets/gba.ini ...
    Installing new version of config file /etc/mame/presets/lcd-matrix.ini ...
    Installing new version of config file /etc/mame/presets/lcd.ini ...
    Installing new version of config file /etc/mame/presets/raster.ini ...
    Installing new version of config file /etc/mame/presets/vector-mono.ini ...
    Installing new version of config file /etc/mame/presets/vector.ini ...
    Processing triggers for man-db (2.7.6.1-2) ...
    Processing triggers for menu (2.1.47+b1) ...
    Processing triggers for hicolor-icon-theme (0.17-1) ...
    Processing triggers for desktop-file-utils (0.23-2) ...
    Processing triggers for gnome-menus (3.13.3-9) ...
    Processing triggers for mime-support (3.60) ...
    
    real    19m0.710s
    user    0m7.928s
    sys    0m2.538s
    knoppix@Microknoppix:~$
    The fat32 file overlay:

    Code:
    knoppix@Microknoppix:~$ time sudo dpkg -i /mnt-system/mamepackages/mame_0.189+dfsg.1-1_i386.deb /mnt-system/mamepackages/mame-data_0.189+dfsg.1-1_all.deb 
    dpkg: warning: downgrading mame from 1:0.186-dmo1 to 0.189+dfsg.1-1
    (Reading database ... 451601 files and directories currently installed.)
    Preparing to unpack .../mame_0.189+dfsg.1-1_i386.deb ...
    Unpacking mame (0.189+dfsg.1-1) over (1:0.186-dmo1) ...
    dpkg: warning: downgrading mame-data from 1:0.186-dmo1 to 0.189+dfsg.1-1
    Preparing to unpack .../mame-data_0.189+dfsg.1-1_all.deb ...
    Unpacking mame-data (0.189+dfsg.1-1) over (1:0.186-dmo1) ...
    Setting up mame-data (0.189+dfsg.1-1) ...
    Setting up mame (0.189+dfsg.1-1) ...
    Installing new version of config file /etc/mame/presets/gameboy.ini ...
    Installing new version of config file /etc/mame/presets/gba.ini ...
    Installing new version of config file /etc/mame/presets/lcd-matrix.ini ...
    Installing new version of config file /etc/mame/presets/lcd.ini ...
    Installing new version of config file /etc/mame/presets/raster.ini ...
    Installing new version of config file /etc/mame/presets/vector-mono.ini ...
    Installing new version of config file /etc/mame/presets/vector.ini ...
    Processing triggers for desktop-file-utils (0.23-2) ...
    Processing triggers for gnome-menus (3.13.3-9) ...
    Processing triggers for mime-support (3.60) ...
    Processing triggers for hicolor-icon-theme (0.17-1) ...
    Processing triggers for man-db (2.7.6.1-2) ...
    Processing triggers for menu (2.1.47+b1) ...
    
    real    4m31.019s
    user    0m8.833s
    sys    0m5.901s
    
    knoppix@Microknoppix:~$ time sudo dpkg -i /mnt-system/mamepackages/mame_0.186-dmo1_i386.deb /mnt-system/mamepackages/mame-data_0.186-dmo1_all.deb 
    (Reading database ... 451579 files and directories currently installed.)
    Preparing to unpack .../mame_0.186-dmo1_i386.deb ...
    Unpacking mame (1:0.186-dmo1) over (0.189+dfsg.1-1) ...
    Preparing to unpack .../mame-data_0.186-dmo1_all.deb ...
    Unpacking mame-data (1:0.186-dmo1) over (0.189+dfsg.1-1) ...
    Setting up mame-data (1:0.186-dmo1) ...
    Setting up mame (1:0.186-dmo1) ...
    Installing new version of config file /etc/mame/presets/gameboy.ini ...
    Installing new version of config file /etc/mame/presets/gba.ini ...
    Installing new version of config file /etc/mame/presets/lcd-matrix.ini ...
    Installing new version of config file /etc/mame/presets/lcd.ini ...
    Installing new version of config file /etc/mame/presets/raster.ini ...
    Installing new version of config file /etc/mame/presets/vector-mono.ini ...
    Installing new version of config file /etc/mame/presets/vector.ini ...
    Processing triggers for man-db (2.7.6.1-2) ...
    Processing triggers for menu (2.1.47+b1) ...
    Processing triggers for hicolor-icon-theme (0.17-1) ...
    Processing triggers for desktop-file-utils (0.23-2) ...
    Processing triggers for gnome-menus (3.13.3-9) ...
    Processing triggers for mime-support (3.60) ...
    
    real    2m3.485s
    user    0m7.394s
    sys    0m1.280s
    With the reiserfs overlay partition, both operations take 37 minutes,
    with the ext2 fat32 overlay file, both operations take around 7 minutes.

    So reiserfs is about 5 times slower in this case.

    It's pretty clear that you want to use the overlay file when you install to a flash drive.

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