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    Subject[ANNOUNCE] DeskOpt 005 (completely unfair scheduling ;))
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    Hi,

    Completely fair scheduling is really good thing, but if you want the best
    performance for certain application you need to tune up some things.

    DeskOpt is designed to help people tune up their systems for certain tasks.

    Here are the results from the Nexuiz benchmark

    |------------------------------------------------------------------------|
    | | CFS + CFQ | CFS + CFQ + DeskOpt * |
    |------------------------------------------------------------------------|
    | timedemo demos/demo2 | 41,395896833 fps | 41,460051233 fps |
    |--------------------------|-------------------|-------------------------|
    | timedemo demos/demo2 | 18,343223633 fps | 37,814504933 fps |
    | + massive_intr 4 1000 | | |
    |--------------------------|-------------------|-------------------------|
    | timedemo demos/demo2 | 9,334974533 fps | 37,376611267 fps |
    | + massive_intr 8 1000 | | |
    |------------------------------------------------------------------------|

    * default class for games

    Software requirements:
    - Python 2.x (http://python.org/)
    - elementtree (http://effbot.org/downloads/#elementtree)

    DeskOpt installation:
    cp deskopt /usr/local/bin/
    mkdir /etc/deskopt/
    cp deskopt.conf /etc/deskopt/
    cp deskopt.rc /etc/init.d/

    The configuration file must be a valid XML file.

    CFQ tuning:
    back_seek_max
    back_seek_penalty
    fifo_batch_expire
    fifo_batch_async
    fifo_batch_sync
    quantum
    slice_sync
    slice_idle
    slice_async
    slice_async_rq

    http://lwn.net/Articles/101029/
    http://lwn.net/Articles/114273/

    Anticipatory tuning:
    antic_expire
    read_batch_expire
    read_expire
    write_batch_expire
    write_expire

    Documentation/block/as-iosched.txt

    Deadline tuning:
    fifo_batch
    front_merges
    read_expire
    write_expire
    writes_starved

    Documentation/block/deadline-iosched.txt
    http://kerneltrap.org/node/431


    Usage: deskopt [options]

    Options:
    -h, --help show this help message and exit
    -c CONFIG_FILE, --config-file=CONFIG_FILE
    Configuration file
    -d, --debug Debug
    -H HDD, --hard-drives=HDD
    List of hard drives
    -l LOOP_TIME, --loop-time=LOOP_TIME
    Loop time
    -q, --quit Quit
    -v, --version Show version number

    Example:
    # deskopt -c /path/to/my/config/file.conf --hard-drives="sda hdb" -l 60
    or
    # deskopt -c /path/to/my/config/file.conf

    The latest version of DeskOpt can be downloaded from
    http://www.stardust.webpages.pl/files/tools/deskopt/

    Changelog:
    - support for Anticipatory and Deadline scheduler (requested by Chris Snook)
    - support for a different hard drives (previous version was limited to hdd
    with /usr partition)
    - something like a documentation (requested by Satyam Sharma)
    - the code looks a bit better now

    diff -uprN deskopt-004/deskopt deskopt-005/deskopt | diffstat
    deskopt | 870 +++++++++++++++++++++++++++++++++++++++++-----------------------
    1 file changed, 562 insertions(+), 308 deletions(-)

    TODO:
    - support for device queue length tuning (suggested by Andi Kleen)
    - kill signal handling, bug fixes etc.

    Comments and suggestions are welcome.

    It still has many flaws :)

    Regards,
    Michal

    --
    LOG
    http://www.stardust.webpages.pl/log/
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