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Re: [Qemu-discuss]  qcow2 performanceimprove 

From: yang.bin18
Subject: Re: [Qemu-discuss]  qcow2 performanceimprove 
Date: Fri, 17 Aug 2018 10:28:49 +0800 (CST)

>>>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>>>clusters.>>>>     
>>>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>Berto

   Why  could guest read the area  at offset [0, 4k] has not be writen yet ?


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