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    SubjectRe: Oops on boot with TCQ enabled (VIA KT133A)
    On Sun, Oct 20 2002, Vojtech Pavlik wrote:
    > On Sun, Oct 20, 2002 at 02:38:34AM +0200, Jens Axboe wrote:
    > > On Sat, Oct 19 2002, Vojtech Pavlik wrote:
    > > > On Sat, Oct 19, 2002 at 10:24:03PM +0200, Vojtech Pavlik wrote:
    > > >
    > > > > > It's not an oops, and it's not causes by TCQ either. The above is simply
    > > > > > a reminder to fix the ide init sequence, because it's probe sequence
    > > > > > tries to use drive->disk before it has been set up. That is worked
    > > > > > around, but stack is dumped for good measure. So you can feel
    > > > > > comfortable using 2.5.44 regardless.
    > > > > >
    > > > > > But I'm curious about TCQ on your system, since another VIA user
    > > > > > reported problems. Does it appear to work for you?
    > > > >
    > > > > It definitely works on my VIA just fine.
    > > >
    > > > Famous last words. I tried to play with the /proc using_tcq setting and
    > > > got a filesystem corruption immediately.
    > >
    > > There _may_ be issues with changing depth on the fly. So if you could
    > > just test without fiddling with changing depths that would be great.
    >
    > Ok. No changes in /proc using_tcq after boot, assuming it's enabled
    > automatically (checked that in kernel config0, it works perfectly fine.

    Thanks for verifying that! Jan, you appeared to have problems even with
    tcq-per-default enabled and not touching the depth while running io, is
    that correct?

    --
    Jens Axboe

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