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    SubjectRe: SOLVED - Testing IDE-TCQ and Taskfile - doesn't work nicely:)

    On Wed, 25 Jun 2003, Jan-Benedict Glaw wrote:

    > On Wed, 2003-06-25 20:44:19 +0200, Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
    > wrote in message <Pine.SOL.4.30.0306252040570.11992-100000@mion.elka.pw.edu.pl>:
    > > On Wed, 25 Jun 2003, Jan-Benedict Glaw wrote:
    > > > On Wed, 2003-06-25 01:08:13 +0200, Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
    > > > wrote in message <Pine.SOL.4.30.0306250107180.17106-100000@mion.elka.pw.edu.pl>:
    > > > > On Wed, 25 Jun 2003, Jan-Benedict Glaw wrote:
    > > > > > On Tue, 2003-06-24 15:44:36 +0200, Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
    > > > > > wrote in message <Pine.SOL.4.30.0306241543050.23584-100000@mion.elka.pw.edu.pl>:
    >
    > > > However, allow me to ask why this occured never bevore (for other
    > > > people)? Do they all have only one drive? Does nobody use TCQ? Nobody
    > > > with old hardware (though, your patch hasn't touched the core PIIX
    > > > parts...)?
    > >
    > > nobody is stupid^H^Hbrave enough to use TCQ ;-)
    >
    > Well... I knew that it was, erm, brave to use it at some time (this box
    > isn't really important - if I kill its filesystems, I'll simply
    > re-install and recover my mirror scripts:) , but new, where 2.5.x
    > starts to be really useable, I'd suggest to face users with upcoming
    > problems:

    I think 2.5.x is really useable.

    > CONFIG_IDE_TASKFILE_IO
    > It is safe to say Y to this question, in most cases.
    >
    > (By the way, exactly which cases are ment?)

    Ehh... 3 weird bugreports (all are oopses):
    - on x86_64 with 32 bit userspace when reading /proc/ide/hdx/identify
    - in task_mulout_intr() on access to freed rq->bio
    - "bad: scheduling while atomic"

    I don't have any ideas how to find&fix these bugs...

    > CONFIG_BLK_DEV_IDE_TCQ
    > If you have such a drive, say Y here.

    TCQ is marked (EXPERIMENTAL) but there should be warning
    about potential risk... :-)

    > CONFIG_BLK_DEV_IDE_TCQ_DEFAULT
    > Generally say Y here.
    >
    >
    > CONFIG_BLK_DEV_IDE_TCQ_DEPTH
    > You probably just want the default of 32 here.
    >
    > (Default queue depth is 8, not 32...)

    Jens did some testing ages ago and 8 was optimal...

    > Right now, I'm building 2.5.73-bk3 + your 2nd patch. Let's face it:)

    Okay. :-)
    --
    Bartlomiej

    > MfG, JBG
    >
    > --
    > Jan-Benedict Glaw jbglaw@lug-owl.de . +49-172-7608481
    > "Eine Freie Meinung in einem Freien Kopf | Gegen Zensur | Gegen Krieg
    > fuer einen Freien Staat voll Freier Bürger" | im Internet! | im Irak!
    > ret = do_actions((curr | FREE_SPEECH) & ~(IRAQ_WAR_2 | DRM | TCPA));

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