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Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster


From: Alberto Garcia
Subject: Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster
Date: Wed, 19 Aug 2020 17:53:07 +0200
User-agent: Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)

On Wed 19 Aug 2020 05:37:12 PM CEST, Alberto Garcia wrote:
> I ran the test again on a newly created filesystem just to make sure,
> here are the full results (numbers are IOPS):
>
> |----------------------+-------+-------|
> | preallocation        |  ext4 |   xfs |
> |----------------------+-------+-------|
> | off                  | 11688 |  6981 |
> | off (w/o ZERO_RANGE) |  2780 |  3196 |
> | metadata             |  9132 |  5764 |
> | falloc               | 13108 |  5727 |
> | full                 | 16351 | 40759 |
> |----------------------+-------+-------|

Oh, and this is probably relevant, but the ext4 fs has much more free
space than the xfs one (which is almost full with the fully allocated
image). I'll try to run the tests again tomorrow with a larger
filesystem.

Berto



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