Re: Fwd: btrfs / io-uring corrupting reads

From: Filipe Manana <fdmanana@kernel.org>
To: Daniel Black <daniel@mariadb.org>
Cc: io-uring@vger.kernel.org, linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Fwd: btrfs / io-uring corrupting reads
Date: Tue, 22 Feb 2022 12:46:32 +0000	[thread overview]
Message-ID: <CAL3q7H5mSV69ambZy_uCnTMOW7U0n_fU1DtVNA-FYwDdHVrp9w@mail.gmail.com> (raw)
In-Reply-To: <CABVffENr6xfB=ujMhMEVywbuzo8kYTSVzym1ctCbZOPipVCpHg@mail.gmail.com>

On Tue, Feb 22, 2022 at 12:22 PM Daniel Black <daniel@mariadb.org> wrote:
>
> On Tue, Feb 22, 2022 at 10:42 PM Filipe Manana <fdmanana@kernel.org> wrote:
>
> > I gave it a try, but it fails setting up io_uring:
> >
> > 2022-02-22 11:27:13 0 [Note] mysqld: O_TMPFILE is not supported on /tmp (disabling future attempts)
> > 2022-02-22 11:27:13 0 [Warning] mysqld: io_uring_queue_init() failed with errno 1
> > 2022-02-22 11:27:13 0 [Warning] InnoDB: liburing disabled: falling back to innodb_use_native_aio=OFF
> > 2022-02-22 11:27:13 0 [Note] InnoDB: Initializing buffer pool, total size = 134217728, chunk size = 134217728
> > 2022-02-22 11:27:13 0 [Note] InnoDB: Completed initialization of buffer pool
> >
> > So that's why it doesn't fail here, as it fallbacks to no aio mode.
>
> error 1 is EPERM. Seems it needs --privileged on the container startup
> as a podman argument (before the image name). Sorry I missed that
>
> > Any idea why it's failing to setup io_uring?
> >
> > I have the liburing2 and liburing-dev packages installed on debian, and
> > tried with a 5.17-rc4 kernel.
>
> Taking https://packages.debian.org/bookworm/mariadb-server-core-10.6 package:
>
> mariadb-install-db --no-defaults --datadir=/empty/btrfs/path
> --innodb-use-native-aio=0
>
> mariadbd --no-defaults --datadir=/empty/btrfs/path --innodb-use-native-aio=1
>
> should achieve the same thing.

Sorry, I have no experience with mariadb and podman. How am I supposed
to run that?
Is that supposed to run inside the container, on the host? Do I need
to change the podman command lines?

What I did before was:

DEV=/dev/sdh
MNT=/mnt/sdh

mkfs.btrfs -f $DEV
mount $DEV $MNT

mkdir $MNT/noaio
chown fdmanana: $MNT/noaio

podman run --name mdbinit --rm -v $MNT/noaio/:/var/lib/mysql:Z -e
MARIADB_ALLOW_EMPTY_ROOT_PASSWORD=1
quay.io/danielgblack/mariadb-test:10.6-impish-sysbench
--innodb_use_native_aio=0

Then in another shell:

podman kill --all

podman run --rm -v $MNT/noaio/:/var/lib/mysql:Z -e
MARIADB_ALLOW_EMPTY_ROOT_PASSWORD=1
quay.io/danielgblack/mariadb-test:10.6-impish-sysbench
--innodb_use_native_aio=1

What should I change or add in there?

Thanks.