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From: David Sterba <dsterba@suse.cz>
To: Naohiro Aota <naohiro.aota@wdc.com>
Cc: linux-btrfs@vger.kernel.org, dsterba@suse.com, hare@suse.com,
	linux-fsdevel@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
	Christoph Hellwig <hch@infradead.org>,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	Josef Bacik <josef@toxicpanda.com>
Subject: Re: [PATCH v14 32/42] btrfs: avoid async metadata checksum on ZONED mode
Date: Tue, 2 Feb 2021 15:54:18 +0100	[thread overview]
Message-ID: <20210202145418.GX1993@twin.jikos.cz> (raw)
In-Reply-To: <13728adcc4f433c928b00be73ea5466f62ccb4b9.1611627788.git.naohiro.aota@wdc.com>

On Tue, Jan 26, 2021 at 11:25:10AM +0900, Naohiro Aota wrote:
> In ZONED, btrfs uses per-FS zoned_meta_io_lock to serialize the metadata
> write IOs.
> 
> Even with these serialization, write bios sent from btree_write_cache_pages
> can be reordered by async checksum workers as these workers are per CPU and
> not per zone.
> 
> To preserve write BIO ordering, we can disable async metadata checksum on
> ZONED.  This does not result in lower performance with HDDs as a single CPU
> core is fast enough to do checksum for a single zone write stream with the
> maximum possible bandwidth of the device. If multiple zones are being
> written simultaneously, HDD seek overhead lowers the achievable maximum
> bandwidth, resulting again in a per zone checksum serialization not
> affecting performance.
> 
> Reviewed-by: Josef Bacik <josef@toxicpanda.com>
> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
> ---
>  fs/btrfs/disk-io.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index a41bdf9312d6..5d14100ecf72 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -814,6 +814,8 @@ static blk_status_t btree_submit_bio_start(struct inode *inode, struct bio *bio,
>  static int check_async_write(struct btrfs_fs_info *fs_info,
>  			     struct btrfs_inode *bi)
>  {
> +	if (btrfs_is_zoned(fs_info))
> +		return 0;

This check need to be after the other ones as zoned is a static per-fs
status, while other others depend on either current state or system
state (crypto implementation).

>  	if (atomic_read(&bi->sync_writers))
>  		return 0;
>  	if (test_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags))
> -- 
> 2.27.0

  reply	other threads:[~2021-02-02 14:57 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-26  2:24 [PATCH v14 00/42] btrfs: zoned block device support Naohiro Aota
2021-01-26  2:24 ` [PATCH v14 01/42] block: add bio_add_zone_append_page Naohiro Aota
2021-01-26 16:08   ` Jens Axboe
2021-01-26  2:24 ` [PATCH v14 02/42] iomap: support REQ_OP_ZONE_APPEND Naohiro Aota
2021-01-26  2:24 ` [PATCH v14 03/42] btrfs: defer loading zone info after opening trees Naohiro Aota
2021-01-30 22:09   ` Anand Jain
2021-01-26  2:24 ` [PATCH v14 04/42] btrfs: use regular SB location on emulated zoned mode Naohiro Aota
2021-01-30 22:28   ` Anand Jain
2021-01-26  2:24 ` [PATCH v14 05/42] btrfs: release path before calling into btrfs_load_block_group_zone_info Naohiro Aota
2021-01-30 23:21   ` Anand Jain
2021-01-26  2:24 ` [PATCH v14 06/42] btrfs: do not load fs_info->zoned from incompat flag Naohiro Aota
2021-01-30 23:40   ` Anand Jain
2021-01-26  2:24 ` [PATCH v14 07/42] btrfs: disallow fitrim in ZONED mode Naohiro Aota
2021-01-30 23:44   ` Anand Jain
2021-01-26  2:24 ` [PATCH v14 08/42] btrfs: allow zoned mode on non-zoned block devices Naohiro Aota
2021-01-31  1:17   ` Anand Jain
2021-02-01 11:06     ` Johannes Thumshirn
2021-02-02  1:49   ` Anand Jain
2021-01-26  2:24 ` [PATCH v14 09/42] btrfs: implement zoned chunk allocator Naohiro Aota
2021-01-26  2:24 ` [PATCH v14 10/42] btrfs: verify device extent is aligned to zone Naohiro Aota
2021-01-26  2:24 ` [PATCH v14 11/42] btrfs: load zone's allocation offset Naohiro Aota
2021-01-26  2:24 ` [PATCH v14 12/42] btrfs: calculate allocation offset for conventional zones Naohiro Aota
2021-01-27 18:03   ` Josef Bacik
2021-02-03  5:19   ` Anand Jain
2021-02-03  6:10     ` Damien Le Moal
2021-02-03  6:56       ` Anand Jain
2021-02-03  7:10         ` Damien Le Moal
2021-01-26  2:24 ` [PATCH v14 13/42] btrfs: track unusable bytes for zones Naohiro Aota
2021-01-27 18:06   ` Josef Bacik
2021-01-26  2:24 ` [PATCH v14 14/42] btrfs: do sequential extent allocation in ZONED mode Naohiro Aota
2021-01-26  2:24 ` [PATCH v14 15/42] btrfs: redirty released extent buffers " Naohiro Aota
2021-01-26  2:24 ` [PATCH v14 16/42] btrfs: advance allocation pointer after tree log node Naohiro Aota
2021-01-26  2:24 ` [PATCH v14 17/42] btrfs: enable to mount ZONED incompat flag Naohiro Aota
2021-01-31 12:21   ` Anand Jain
2021-01-26  2:24 ` [PATCH v14 18/42] btrfs: reset zones of unused block groups Naohiro Aota
2021-01-26  2:24 ` [PATCH v14 19/42] btrfs: extract page adding function Naohiro Aota
2021-01-26  2:24 ` [PATCH v14 20/42] btrfs: use bio_add_zone_append_page for zoned btrfs Naohiro Aota
2021-01-26  2:24 ` [PATCH v14 21/42] btrfs: handle REQ_OP_ZONE_APPEND as writing Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 22/42] btrfs: split ordered extent when bio is sent Naohiro Aota
2021-01-27 19:00   ` Josef Bacik
2021-01-26  2:25 ` [PATCH v14 23/42] btrfs: check if bio spans across an ordered extent Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 24/42] btrfs: extend btrfs_rmap_block for specifying a device Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 25/42] btrfs: cache if block-group is on a sequential zone Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 26/42] btrfs: save irq flags when looking up an ordered extent Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 27/42] btrfs: use ZONE_APPEND write for ZONED btrfs Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 28/42] btrfs: enable zone append writing for direct IO Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 29/42] btrfs: introduce dedicated data write path for ZONED mode Naohiro Aota
2021-02-02 15:00   ` David Sterba
2021-02-04  8:25     ` Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 30/42] btrfs: serialize meta IOs on " Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 31/42] btrfs: wait existing extents before truncating Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 32/42] btrfs: avoid async metadata checksum on ZONED mode Naohiro Aota
2021-02-02 14:54   ` David Sterba [this message]
2021-02-02 16:50     ` Johannes Thumshirn
2021-02-02 19:28       ` David Sterba
2021-01-26  2:25 ` [PATCH v14 33/42] btrfs: mark block groups to copy for device-replace Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 34/42] btrfs: implement cloning for ZONED device-replace Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 35/42] btrfs: implement copying " Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 36/42] btrfs: support dev-replace in ZONED mode Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 37/42] btrfs: enable relocation " Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 38/42] btrfs: relocate block group to repair IO failure in ZONED Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 39/42] btrfs: split alloc_log_tree() Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 40/42] btrfs: extend zoned allocator to use dedicated tree-log block group Naohiro Aota
2021-01-26  2:25 ` [PATCH v14 41/42] btrfs: serialize log transaction on ZONED mode Naohiro Aota
2021-01-27 19:01   ` Josef Bacik
2021-02-01 15:48   ` Filipe Manana
2021-01-26  2:25 ` [PATCH v14 42/42] btrfs: reorder log node allocation Naohiro Aota
2021-02-01 15:48   ` Filipe Manana
2021-02-01 15:54     ` Johannes Thumshirn
2021-01-29  7:56 ` [PATCH v14 00/42] btrfs: zoned block device support Johannes Thumshirn
2021-01-29 20:44   ` David Sterba
2021-01-30 11:30     ` Johannes Thumshirn

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