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    Subject[PATCH 12/20] nbd: limit blk_queue
    Date
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    Limit each request to 1 page, so that the request throttling also limits the
    number of in-flight pages.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Signed-off-by: Daniel Phillips <phillips@google.com>
    CC: Pavel Machek <pavel@ucw.cz>
    ---
    drivers/block/nbd.c | 17 +++++++++++++++--
    1 file changed, 15 insertions(+), 2 deletions(-)

    Index: linux-2.6/drivers/block/nbd.c
    ===================================================================
    --- linux-2.6.orig/drivers/block/nbd.c 2006-09-07 18:43:41.000000000 +0200
    +++ linux-2.6/drivers/block/nbd.c 2006-09-07 18:44:12.000000000 +0200
    @@ -638,6 +638,9 @@ static int __init nbd_init(void)
    put_disk(disk);
    goto out;
    }
    + blk_queue_max_segment_size(disk->queue, PAGE_SIZE);
    + blk_queue_max_hw_segments(disk->queue, 1);
    + blk_queue_max_phys_segments(disk->queue, 1);
    }

    if (register_blkdev(NBD_MAJOR, "nbd")) {
    --

    -
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