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Re: [Qemu-block] Performance impact of the qcow2 overlap checks

From: Alberto Garcia
Subject: Re: [Qemu-block] Performance impact of the qcow2 overlap checks
Date: Wed, 01 Feb 2017 11:48:56 +0100
User-agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)

On Tue 31 Jan 2017 11:31:34 PM CET, Max Reitz <address@hidden> wrote:
>> I think the checks as they are now are very simple and it's not worth
>> complicating them too much unless we have numbers that prove that
>> they're slowing things down. I only got those numbers for the first
>> one.
> I personally just think it's plain stupid to iterate through all of
> the L1 table before every write access. It just hurts my soul.

Right, but that's only a problem if the virtual size of the qcow2 image
is very large, and even in that case it can be easily kept under control
simply by increasing the cluster size.


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