Re: [patch] vmfixes-2.4.0-test9-B2

[Ingo Molnar]

On Mon, 25 Sep 2000, Andrea Arcangeli wrote:

> -             sync_page(page);
>               set_task_state(tsk, TASK_UNINTERRUPTIBLE);
> +             sync_page(page);

> -             run_task_queue(&tq_disk);
>               set_task_state(tsk, TASK_UNINTERRUPTIBLE);
> +             run_task_queue(&tq_disk);

these look like genuine fixes, but i dont think they can explain the hangs
i had yesterday - those were simple VM deadlocks. I dont see any deadlocks
today - but i'm running the unsafe B2 variant of the vmfixes patch. (and i
have no swapping enabled which simplifies my VM setup.)

but one of these two fixes could explain the slowdown i saw on and off for
quite some time, seeing very bad read performance occasionally. (do you
remember my sched.c tq_disc hack?)

        Ingo

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