linux-kernel - [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO

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Message-Id: <1324429254-28383-1-git-send-email-minchan@kernel.org>
Date:	Wed, 21 Dec 2011 10:00:48 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Chris Wright <chrisw@...s-sol.org>, Jens Axboe <axboe@...nel.dk>,
	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Minchan Kim <minchan@...nel.org>
Subject: [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO

This patch is follow-up of Christohp Hellwig's work
[RFC: ->make_request support for virtio-blk].
http://thread.gmane.org/gmane.linux.kernel/1199763

Quote from hch
"This patchset allows the virtio-blk driver to support much higher IOP
rates which can be driven out of modern PCI-e flash devices.  At this
point it really is just a RFC due to various issues."

I fixed race bug and add batch I/O for enhancing sequential I/O,
FLUSH/FUA emulation.

I tested this patch on fusion I/O device by aio-stress.
Result is following as.

Benchmark : aio-stress (64 thread, test file size 512M, 8K io per IO, O_DIRECT write)
Environment: 8 socket - 8 core, 2533.372Hz, Fusion IO 320G storage
Test repeated by 20 times
Guest I/O scheduler : CFQ
Host I/O scheduler : NOOP

            Request            	BIO(patch 1-4)          BIO-batch(patch 1-6)
         (MB/s)  stddev 	(MB/s)  stddev  	(MB/s)  stddev
w        737.820 4.063  	613.735 31.605  	730.288 24.854
rw       208.754 20.450 	314.630 37.352  	317.831 41.719
r        770.974 2.340  	347.483 51.370  	750.324 8.280
rr       250.391 16.910 	350.053 29.986  	325.976 24.846

This patch enhances ramdom I/O performance compared to request-based I/O path.
It's still RFC so welcome to any comment and review.

Christoph Hellwig (3):
  block: add bio_map_sg
  virtio: support unlocked queue kick
  virtio-blk: remove the unused list of pending requests

Minchan Kim (3):
  virtio-blk: implement ->make_request
  virtio-blk: Support batch I/O for enhancing sequential IO
  virtio-blk: Emulate Flush/FUA

 block/blk-merge.c            |   63 ++++
 drivers/block/virtio_blk.c   |  690 ++++++++++++++++++++++++++++++++++++++----
 drivers/virtio/virtio_ring.c |   33 ++-
 include/linux/blkdev.h       |    2 +
 include/linux/virtio.h       |   21 ++
 5 files changed, 737 insertions(+), 72 deletions(-)

-- 
1.7.6.4

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