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block: bump max plugged deferred size from 16 to 32

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[ Upstream commit ba0ffdd8ce48ad7f7e85191cd29f9674caca3745 ]

Particularly for NVMe with efficient deferred submission for many
requests, there are nice benefits to be seen by bumping the default max
plug count from 16 to 32. This is especially true for virtualized setups,
where the submit part is more expensive. But can be noticed even on
native hardware.

Reduce the multiple queue factor from 4 to 2, since we're changing the
default size.

While changing it, move the defines into the block layer private header.
These aren't values that anyone outside of the block layer uses, or
should use.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jens Axboe
2021-10-06 12:01:07 -06:00
committed by Greg Kroah-Hartman
parent 517feec952
commit b34ea3c91e
3 changed files with 8 additions and 4 deletions
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2
include/linux/blkdev.h
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@@ -1248,8 +1248,6 @@ struct blk_plug {
bool multiple_queues;
bool nowait;
};
#define BLK_MAX_REQUEST_COUNT 16
#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
struct blk_plug_cb;
typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);