The patch titled
Subject: nbd: increase default and max request sizes
has been added to the -mm tree. Its filename is
nbd-increase-default-and-max-request-sizes.patch
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------------------------------------------------------
From: Michal Belczyk <belczyk@xxxxxxxxxxxxx>
Subject: 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 <paul.clements@xxxxxxxxxxxx>
Cc: Michal Belczyk <belczyk@xxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/nbd.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN drivers/block/nbd.c~nbd-increase-default-and-max-request-sizes drivers/block/nbd.c
--- a/drivers/block/nbd.c~nbd-increase-default-and-max-request-sizes
+++ a/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")) {
_
Patches currently in -mm which might be from belczyk@xxxxxxxxxxxxx are
nbd-increase-default-and-max-request-sizes.patch
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