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Re: [Qemu-devel] [PATCH 3/8] qed: add support for Copy-on-Read
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From: |
Kevin Wolf |
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Subject: |
Re: [Qemu-devel] [PATCH 3/8] qed: add support for Copy-on-Read |
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Date: |
Fri, 29 Apr 2011 14:14:10 +0200 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10 |
Am 27.04.2011 15:27, schrieb Stefan Hajnoczi:
> From: Anthony Liguori <address@hidden>
>
> When creating an image using qemu-img, just pass '-o copy_on_read' and then
> whenever QED reads from a backing file, it will write the block to the QED
> file after the read completes ensuring that you only fetch from the backing
> device once.
As discussed previously, this is not the right primary interface.
Also, the patch still seems to be broken with respect to concurrent writes.
Kevin
- [Qemu-devel] [RFC PATCH 0/8] QED image streaming, Stefan Hajnoczi, 2011/04/27
- [Qemu-devel] [PATCH 1/8] block: add bdrv_aio_stream, Stefan Hajnoczi, 2011/04/27
- [Qemu-devel] [PATCH 3/8] qed: add support for Copy-on-Read, Stefan Hajnoczi, 2011/04/27
- [Qemu-devel] [PATCH 7/8] qed: Add QED_CF_STREAM flag to auto-enable streaming, Stefan Hajnoczi, 2011/04/27
- [Qemu-devel] [PATCH 4/8] qed: intelligent streaming implementation, Stefan Hajnoczi, 2011/04/27
- [Qemu-devel] [PATCH 6/8] blockdev: Allow image files to auto-enable streaming, Stefan Hajnoczi, 2011/04/27
- [Qemu-devel] [PATCH 5/8] qed: detect zero writes and skip them when to an unalloc cluster, Stefan Hajnoczi, 2011/04/27
- [Qemu-devel] [PATCH 2/8] qmp: Add QMP support for stream commands, Stefan Hajnoczi, 2011/04/27
- [Qemu-devel] [PATCH 8/8] qed: Add -o stream=on image creation option, Stefan Hajnoczi, 2011/04/27
- Re: [Qemu-devel] [RFC PATCH 0/8] QED image streaming, Stefan Hajnoczi, 2011/04/27