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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, 26 Aug 2020 20:34:32 +0200 |
User-agent: |
Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu) |
On Tue 25 Aug 2020 09:47:24 PM CEST, Brian Foster <bfoster@redhat.com> wrote:
> My fio fallocates the entire file by default with this command. Is that
> the intent of this particular test? I added --fallocate=none to my test
> runs to incorporate the allocation cost in the I/Os.
That wasn't intentional, you're right, it should use --fallocate=none (I
don't see a big difference in my test anyway).
>> The Linux version is 4.19.132-1 from Debian.
>
> Thanks. I don't have LUKS in the mix on my box, but I was running on a
> more recent kernel (Fedora 5.7.15-100). I threw v4.19 on the box and
> saw a bit more of a delta between XFS (~14k iops) and ext4 (~24k). The
> same test shows ~17k iops for XFS and ~19k iops for ext4 on v5.7. If I
> increase the size of the LVM volume from 126G to >1TB, ext4 runs at
> roughly the same rate and XFS closes the gap to around ~19k iops as
> well. I'm not sure what might have changed since v4.19, but care to
> see if this is still an issue on a more recent kernel?
Ok, I gave 5.7.10-1 a try but I still get similar numbers.
Perhaps with a larger filesystem there would be a difference? I don't
know.
Berto
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, (continued)
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Alberto Garcia, 2020/08/20
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Dave Chinner, 2020/08/20
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Brian Foster, 2020/08/21
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Alberto Garcia, 2020/08/21
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Alberto Garcia, 2020/08/21
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Brian Foster, 2020/08/21
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Alberto Garcia, 2020/08/25
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Brian Foster, 2020/08/25
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Alberto Garcia, 2020/08/25
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Brian Foster, 2020/08/25
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster,
Alberto Garcia <=
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Brian Foster, 2020/08/27
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Dave Chinner, 2020/08/23
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Alberto Garcia, 2020/08/24
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Brian Foster, 2020/08/21
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Alberto Garcia, 2020/08/21
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Dave Chinner, 2020/08/23
- Re: [PATCH 0/1] qcow2: Skip copy-on-write when allocating a zero cluster, Alberto Garcia, 2020/08/21