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btrfs: zoned: do not use async metadata checksum on zoned filesystems
On zoned filesystems, btrfs uses per-fs zoned_meta_io_lock to serialize the metadata write IOs. Even with this 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 disable async metadata checksum on a zoned filesystem. 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 the performance. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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committed by
David Sterba
parent
24c0a7227f
commit
4eef29ef63
@@ -871,6 +871,8 @@ static blk_status_t btree_submit_bio_start(struct inode *inode, struct bio *bio,
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static int check_async_write(struct btrfs_fs_info *fs_info,
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static int check_async_write(struct btrfs_fs_info *fs_info,
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struct btrfs_inode *bi)
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struct btrfs_inode *bi)
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{
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{
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if (btrfs_is_zoned(fs_info))
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return 0;
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if (atomic_read(&bi->sync_writers))
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if (atomic_read(&bi->sync_writers))
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return 0;
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return 0;
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if (test_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags))
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if (test_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags))
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