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    SubjectRe: 2.5.2-pre1 dbench 32 hangs in vmstat "b" state
    On Fri, Dec 21 2001, rwhron@earthlink.net wrote:
    > On Fri, Dec 21, 2001 at 06:01:56PM +0100, Jens Axboe wrote:
    > > Thanks -- could you also try and do sysrq-t back traces when it seems
    > > stuck?
    > >
    > > Does a non-highmem kernel run ok?
    > >
    > > --
    > > Jens Axboe
    >
    > I recompiled with highmem turned off.
    > # CONFIG_HIGHMEM4G is not set
    > # CONFIG_HIGHMEM64G is not set
    >
    > I run a scripty that executes dbench 32, then dbench 128.

    Ok, please try something for me. In drivers/block/elevator.c, comment
    out this block:

    if (q->last_merge) {
    __rq = list_entry_rq(q->last_merge);
    BUG_ON(__rq->flags & REQ_STARTED);

    if ((ret = elv_try_merge(__rq, bio))) {
    *req = __rq;
    return ret;
    }
    }

    (just #if 0 the entire thing) -- the one inside elevator_linus_merge()

    Loop back highmem issue is different, I'll take a look at that later.
    I'll be pretty unresponsive over christmas, though.

    --
    Jens Axboe

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