diff options
| author | Michal Belczyk <[email protected]> | 2013-04-30 15:28:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2013-04-30 17:04:07 -0700 |
| commit | 078be02b80359a541928c899c2631f39628f56df (patch) | |
| tree | b89690216b6c55b91d9d14775592b660c69010cf | |
| parent | 5cc5445164c16d32bab2912fac28356ab07aa8b4 (diff) | |
nbd: increase default and max request sizes
Raise the default max request size for nbd to 128KB (from 127KB) to get it
4KB aligned. This patch also allows the max request size to be increased
(via /sys/block/nbd<x>/queue/max_sectors_kb) to 32MB.
The patch makes nbd network traffic more efficient by:
- reducing request fragmentation (4KB alignment)
- reducing the number of requests (fewer round trips, less network overhead)
Especially in high latency networks, larger request size can make a dramatic
Signed-off-by: Paul Clements <[email protected]>
Signed-off-by: Michal Belczyk <[email protected]>
Cc: Jens Axboe <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | drivers/block/nbd.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 7fecc784be01..037288e7874d 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -856,6 +856,8 @@ static int __init nbd_init(void) disk->queue->limits.discard_granularity = 512; disk->queue->limits.max_discard_sectors = UINT_MAX; disk->queue->limits.discard_zeroes_data = 0; + blk_queue_max_hw_sectors(disk->queue, 65536); + disk->queue->limits.max_sectors = 256; } if (register_blkdev(NBD_MAJOR, "nbd")) { |