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| author | Ming Lei <ming.lei@canonical.com> | 2014-09-25 17:23:47 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-09-25 23:22:45 +0200 |
| commit | f70ced09170761acb69840cafaace4abc72cba4b (patch) | |
| tree | bc62f5926a5e8b74be30316196a41b25ece12368 /crypto | |
| parent | block: introduce 'blk_mq_ctx' parameter to blk_get_flush_queue (diff) | |
| download | linux-f70ced09170761acb69840cafaace4abc72cba4b.tar.xz linux-f70ced09170761acb69840cafaace4abc72cba4b.zip | |
blk-mq: support per-distpatch_queue flush machinery
This patch supports to run one single flush machinery for
each blk-mq dispatch queue, so that:
- current init_request and exit_request callbacks can
cover flush request too, then the buggy copying way of
initializing flush request's pdu can be fixed
- flushing performance gets improved in case of multi hw-queue
In fio sync write test over virtio-blk(4 hw queues, ioengine=sync,
iodepth=64, numjobs=4, bs=4K), it is observed that througput gets
increased a lot over my test environment:
- throughput: +70% in case of virtio-blk over null_blk
- throughput: +30% in case of virtio-blk over SSD image
The multi virtqueue feature isn't merged to QEMU yet, and patches for
the feature can be found in below tree:
git://kernel.ubuntu.com/ming/qemu.git v2.1.0-mq.4
And simply passing 'num_queues=4 vectors=5' should be enough to
enable multi queue(quad queue) feature for QEMU virtio-blk.
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'crypto')
0 files changed, 0 insertions, 0 deletions