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Re: [Qemu-block] Performance impact of the qcow2 overlap checks
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From: |
Alberto Garcia |
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Subject: |
Re: [Qemu-block] Performance impact of the qcow2 overlap checks |
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Date: |
Wed, 01 Feb 2017 11:48:56 +0100 |
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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.
Berto