Re: [Qemu-devel] [PATCH v6] migration/block: use blk_pwrite_zeroes for each zero cluster

[858585 jemmy]

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.
>
> Fam