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    SubjectDocumentation on CFQ iosched parameters
    Date

    Please CC to me unless you answer to linux-fsdevel as well. I am not
    subscribed to linux-kernel.


    Hi!

    I am searching documentation about CFQ io scheduler. I can't find it in linux
    2.6.26 Documentation directory.

    I found about these in german[1]:

    back_seek_max:16384
    back_seek_penalty:2
    fifo_expire_async:250
    fifo_expire_sync:123
    quantum:4

    But I am completely missing about these:

    slice_async:40
    slice_async_rq:2
    slice_idle:6
    slice_sync:100

    AFAIR there has been a documentation file somewhere, but I can't find it:

    ms@mango> grep -ir "cfq" * ~/lokal/Kernel/linux-2.6.26/Documentation/block
    00-INDEX: - Block io priorities (in CFQ scheduler)
    ioprio.txt:With the introduction of cfq v3 (aka cfq-ts or time sliced cfq),
    basic io
    ioprio.txt:with cfq; other io schedulers do not support io priorities thus
    far.
    ioprio.txt:CFQ implements three generic scheduling classes that determine how
    io is
    switching-sched.txt:'noop', 'as' and 'cfq' (the default) are also available.
    IO schedulers are
    switching-sched.txt:for instance, to set the CFQ scheduler for the system
    default, but
    switching-sched.txt:noop anticipatory deadline [cfq]
    switching-sched.txt:noop [anticipatory] deadline cfq

    (unlike as-iosched.txt)

    I am willing to write that documentation if someone explain these to me so
    that I understand them ;-).

    [1]
    http://www.linux-magazin.de/heft_abo/ausgaben/2005/04/kern_technik/(offset)/4

    Ciao,
    --
    Martin Steigerwald - team(ix) GmbH - http://www.teamix.de
    gpg: 19E3 8D42 896F D004 08AC A0CA 1E10 C593 0399 AE90
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