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    SubjectRe: [PATCH] IDE TCQ #4
    On Mon, Apr 15 2002, Aaron Tiensivu wrote:
    > Simple question but hopefully it has a simple answer.. is there a command
    > you can issue or flag you can look for from the output of hdparm to tell if
    > your hard drive is capable of TCQ before installing the patch? I have a few
    > IBM drives that I'm sure have TCQ abilities but I don't trust them as far as
    > I can throw them (being Hungarian and cursed) but I'd like to give TCQ a
    > whirl on my WD 120GB drives that should work OK, if they support TCQ..
    > Sorry if it's already been asked.. :)

    It has not been asked :-)

    You can run a IDENTIFY_DEVICE from user space with the task ioctls and
    look at word 83 -- bit 1 and 14 must be set for TCQ to be supported. If
    you give me the model identifier from the IBM drive, I can tell you if
    it has tcq or not...

    I'll write a small util to detect this tomorrow and send it to you + the

    I thought only the IBM's had TCQ, but I got one report today indicating
    that some WD do too.

    Jens Axboe

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