Re: [Qemu-devel] [PATCH 0/3] qcow2: Write complete sectors

[Kevin Wolf]

Dor Laor schrieb:
> On 06/16/2009 12:31 PM, Kevin Wolf wrote:
>> Once upon a time, there was a bdrv_pwrite that actually wrote single bytes to
>> the file... However, today it is emulated by a read-modify-write cycle which
>> aligns the request to sector size. This is slow. And we don't need it: qcow2
>> often has the complete sector in memory, we don't need to read it from the 
>> disk
>> again.
>>
>> These patches change the writes to L1 tables, L2 tables and refcount blocks 
>> to
>> write complete sectors instead of single entries.
>>
>> This series depends on the qcow2 split to apply cleanly.
>>
>>    
> 
> If it's not an RFC, you better prepare a git tree for Anthony to pull from

I can do that, but the patches need to be on the list anyway.

> and described how did you test it. Maybe committing the qemu-io scripts
> would also be a move in the right direction.

Anthony is promising for a while now that he will push his tests to the
tree. Once he has done so, I'll consider integrating my script.

Kevin