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Re: [Qemu-block] [PATCH 0/7] qcow2: Reduce the number of I/O ops when do

From: Kevin Wolf
Subject: Re: [Qemu-block] [PATCH 0/7] qcow2: Reduce the number of I/O ops when doing COW
Date: Fri, 26 May 2017 12:17:27 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

Am 24.05.2017 um 18:09 hat Anton Nefedov geschrieben:
> I agree; as mentioned we have similar patches and they don't conflict much.
> We noticed a performance regression on HDD though, for the
> presumably optimized case (random 4k write over a large backed
> image); so the patches were put on hold.

You're talking about your own patches that should do the same thing,
right? Can you re-do the same test with Berto's patches? Maybe there was
just an implementation glitch in yours.

This approach should very obviously result in a performance improvement,
and the patches are relatively simple, so I'm very much inclined to
merge this as soon as possible.


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