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SubjectRe: [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO
Date
On Wed, 21 Dec 2011 10:00:48 +0900, Minchan Kim <minchan@kernel.org> wrote:
> 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

So, you dropped w and r down 2%, but rw and rr up 40%.

If I knew what the various rows were, I'd have something intelligent to
say, I'm sure :)

I can find the source to aio-stress, but no obvious clues.

Help!
Rusty.


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