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Re: [Qemu-block] [PATCH v3 0/4] qcow2: async handling of fragmented io

From: Max Reitz
Subject: Re: [Qemu-block] [PATCH v3 0/4] qcow2: async handling of fragmented io
Date: Thu, 15 Aug 2019 16:09:17 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 15.08.19 14:10, Vladimir Sementsov-Ogievskiy wrote:
> Hi all!
> Here is an asynchronous scheme for handling fragmented qcow2
> reads and writes. Both qcow2 read and write functions loops through
> sequential portions of data. The series aim it to parallelize these
> loops iterations.
> It improves performance for fragmented qcow2 images, I've tested it
> as described below.

Looks good to me, but I can’t take it yet because I need to wait for
Stefan’s branch to be merged, of course.

Speaking of which, why didn’t you add any tests for the *_part()
methods?  I find it a bit unsettling that nothing would have caught the
bug you had in v2 in patch 3.


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