From: Rusty Russell <rusty@rustcorp.com.au>
To: Minchan Kim <minchan@kernel.org>
Cc: Chris Wright <chrisw@sous-sol.org>, Jens Axboe <axboe@kernel.dk>,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>,
Minchan Kim <minchan@kernel.org>
Subject: Re: [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO
Date: Wed, 21 Dec 2011 15:38:03 +1030 [thread overview]
Message-ID: <87mxamjyvg.fsf@rustcorp.com.au> (raw)
In-Reply-To: <1324429254-28383-1-git-send-email-minchan@kernel.org>
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.
next prev parent reply other threads:[~2011-12-21 5:08 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-21 1:00 [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO Minchan Kim
2011-12-21 1:00 ` [PATCH 1/6] block: add bio_map_sg Minchan Kim
2011-12-21 1:00 ` [PATCH 2/6] virtio: support unlocked queue kick Minchan Kim
2011-12-21 1:00 ` [PATCH 3/6] virtio-blk: remove the unused list of pending requests Minchan Kim
2011-12-21 1:00 ` [PATCH 4/6] virtio-blk: implement ->make_request Minchan Kim
2011-12-22 12:20 ` Stefan Hajnoczi
2011-12-22 20:28 ` Christoph Hellwig
2011-12-21 1:00 ` [PATCH 5/6] virtio-blk: Support batch I/O for enhancing sequential IO Minchan Kim
2011-12-21 1:00 ` [PATCH 6/6] virtio-blk: Emulate Flush/FUA Minchan Kim
2011-12-21 5:08 ` Rusty Russell [this message]
2011-12-21 5:56 ` [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO Minchan Kim
2011-12-21 8:28 ` Sasha Levin
2011-12-21 8:17 ` Minchan Kim
2011-12-21 19:11 ` Vivek Goyal
2011-12-22 1:05 ` Minchan Kim
2011-12-22 15:45 ` Vivek Goyal
2011-12-22 23:26 ` Minchan Kim
2011-12-22 12:57 ` Stefan Hajnoczi
2011-12-22 23:41 ` Minchan Kim
2012-01-01 16:45 ` Stefan Hajnoczi
2012-01-02 7:48 ` Dor Laor
2012-01-02 16:12 ` Paolo Bonzini
2012-01-02 16:15 ` Christoph Hellwig
2012-01-02 16:18 ` Paolo Bonzini
2012-01-02 16:23 ` Christoph Hellwig
2012-01-02 16:18 ` Christoph Hellwig
2012-01-02 16:21 ` Avi Kivity
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