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Re: [Qemu-devel] [PATCH v6] migration/block: use blk_pwrite_zeroes for e


From: 858585 jemmy
Subject: Re: [Qemu-devel] [PATCH v6] migration/block: use blk_pwrite_zeroes for each zero cluster
Date: Mon, 24 Apr 2017 15:40:05 +0800

On Mon, Apr 17, 2017 at 12:00 PM, 858585 jemmy <address@hidden> wrote:
> On Mon, Apr 17, 2017 at 11:49 AM, Fam Zheng <address@hidden> wrote:
>> On Fri, 04/14 14:30, 858585 jemmy wrote:
>>> Do you know some other format which have very small cluster size?
>>
>> 64k is the default cluster size for qcow2 but it can be configured at image
>> creation time, as 512 bytes, for example:
>>
>>     $ qemu-img create -f qcow2 test.qcow2 -o cluster_size=512 1G
>
> Thanks, i will test the performance again.

I find the performance reduce when cluster size is 512.
I will optimize the performance and submit a patch later.
Thanks.

>>
>> Fam



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