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

[858585 jemmy]

On Mon, Apr 24, 2017 at 8:19 PM, Fam Zheng <address@hidden> wrote:
> On Mon, 04/24 20:09, Fam Zheng wrote:
>> It's a separate problem.
>
> To be specific:
>
> 1) there is an option "overlap-check" that one can use to
> disable the costly metadata check;
yes, i will disable metadata check, and test the performance again.

>
> 2) qcow2 with cluster_size = 512 is probably too uncommon to be optimized for.
if culster_size is very small, should disable metadata check default?

>
> Both are irrelevant to why and how this patch can be improved, IMO.
>
> Fam