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Re: [Qemu-discuss]  qcow2 performance improve 

From: Alberto Garcia
Subject: Re: [Qemu-discuss]  qcow2 performance improve 
Date: Thu, 16 Aug 2018 13:07:40 +0200
User-agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)

On Thu 16 Aug 2018 10:20:12 AM CEST, address@hidden wrote:
>>If there is no backing file or snapshot you still need to fill the
>>cluster with zeroes, and that's going to be slower with larger
>     If not fill zeroes and only write guest data ,what`s wrong could
>     happen ?

The following could happen:

 1) Guest reads at offset  [0,   4k] -> there's only zeroes
 2) Guest writes at offset [8k, 16k]
 3) Guest reads at offset  [0,   4k] -> there's something else now


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