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Re: [Qemu-devel] [RFC PATCH v2 00/23] qcow2: Delayed COW
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-devel] [RFC PATCH v2 00/23] qcow2: Delayed COW |
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Date: |
Thu, 14 Feb 2013 11:43:57 +0100 |
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User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Feb 13, 2013 at 02:21:50PM +0100, Kevin Wolf wrote:
> iozone results with and without this series show significant difference
> for allocating writes:
>
> random random
> KB reclen write rewrite read reread read write
>
> base 65536 8 1727 1945 12546 12539 2449 1836
> patch 65536 8 1934 1949 12263 12521 2463 1796
>
> base 1048576 256 22344 38437 105823 106135 37743 32167
> patch 1048576 256 35989 38542 105231 105994 38301 33036
I imagine the benefit is even greater for 4 KB or 8 KB blocksize?
Stefan
- Re: [Qemu-devel] [RFC PATCH v2 19/23] qcow2: Add error handling to the l2meta coroutine, (continued)
- [Qemu-devel] [RFC PATCH v2 14/23] qcow2: Use byte granularity in qcow2_alloc_cluster_offset(), Kevin Wolf, 2013/02/13
- [Qemu-devel] [RFC PATCH v2 17/23] qcow2: Move COW and L2 update into own coroutine, Kevin Wolf, 2013/02/13
- [Qemu-devel] [RFC PATCH v2 22/23] qcow2: Move cluster gathering to a non-looping loop, Kevin Wolf, 2013/02/13
- [Qemu-devel] [RFC PATCH v2 21/23] qemu-iotests: Another concurrent multicluster allocation case, Kevin Wolf, 2013/02/13
- [Qemu-devel] [RFC PATCH v2 20/23] qcow2: Cancel COW when overwritten, Kevin Wolf, 2013/02/13
- [Qemu-devel] [RFC PATCH v2 23/23] qcow2: Gather clusters in a looping loop, Kevin Wolf, 2013/02/13
- Re: [Qemu-devel] [RFC PATCH v2 00/23] qcow2: Delayed COW,
Stefan Hajnoczi <=
- Re: [Qemu-devel] [RFC PATCH v2 00/23] qcow2: Delayed COW, Stefan Hajnoczi, 2013/02/18