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Re: [Qemu-devel] [PATCH v3] qemu-img: use blk_co_pwrite_zeroes for zero
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From: |
Max Reitz |
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Subject: |
Re: [Qemu-devel] [PATCH v3] qemu-img: use blk_co_pwrite_zeroes for zero sectors when compressed |
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Date: |
Fri, 28 Apr 2017 18:19:41 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.0 |
On 27.04.2017 04:58, address@hidden wrote:
> From: Lidong Chen <address@hidden>
>
> When the buffer is zero, blk_co_pwrite_zeroes is more effective than
> blk_co_pwritev with BDRV_REQ_WRITE_COMPRESSED. This patch can reduce
> the time for converting qcow2 images with lots of zero data.
>
> Signed-off-by: Lidong Chen <address@hidden>
> ---
> v3 changelog:
> fix some spelling errors and code style.
> v2 changelog:
> unify the compressed and non-compressed code paths.
> ---
> qemu-img.c | 44 ++++++++++++++------------------------------
> 1 file changed, 14 insertions(+), 30 deletions(-)
Thank you, I have applied the patch to my block branch:
https://github.com/XanClic/qemu/commits/block
Max
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