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SubjectRe: [PATCH 12/20] nbd: limit blk_queue
On Tue, Sep 12 2006, Peter Zijlstra wrote:
> 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);

Another bandaid. What happens if nr_requests number of pages is still
too many for a system? You just moved whatever problem you had, you
didn't solve anything.

--
Jens Axboe

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