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Message-ID: <20111214143156.GA22511@localhost>
Date: Wed, 14 Dec 2011 22:31:56 +0800
From: Wu Fengguang <fengguang.wu@...el.com>
To: linux-fsdevel@...r.kernel.org
Cc: LKML <linux-kernel@...r.kernel.org>,
Dave Chinner <david@...morbit.com>,
Christoph Hellwig <hch@...radead.org>
Subject: XFS/btrfs performance after IO-less dirty throttling
Hi,
This very basic 1-disk performance comparison shows +8.3% overall
improvements for XFS and +6.2% for btrfs.
The thresh=1M cases see big "regressions", however that's due to much
more strictly executed global dirty limit. So not real problems.
The other big regressions happen in the XFS UKEY-thresh=100M cases.
Need to explore what's going on inside XFS...
wfg@bee /export/writeback% ./compare -g xfs fat/*/*-3.1.0+ fat/*/*-3.2.0-rc3
3.1.0+ 3.2.0-rc3
------------------------ ------------------------
43.24 +11.6% 48.26 fat/UKEY-HDD/xfs-100dd-1-3.1.0+
51.35 +8.3% 55.62 fat/UKEY-HDD/xfs-10dd-1-3.1.0+
58.73 +5.7% 62.09 fat/UKEY-HDD/xfs-1dd-1-3.1.0+
4.17 -37.8% 2.59 fat/UKEY-thresh=100M/xfs-100dd-1-3.1.0+
4.14 -53.3% 1.94 fat/UKEY-thresh=100M/xfs-10dd-1-3.1.0+
6.30 +0.4% 6.33 fat/UKEY-thresh=100M/xfs-1dd-1-3.1.0+
8.88 +18.0% 10.48 fat/fio/xfs-fio_fat_mmap_randwrite_4k-1-3.1.0+
36.01 +25.2% 45.07 fat/fio/xfs-fio_fat_mmap_randwrite_64k-1-3.1.0+
47.04 +9.2% 51.38 fat/fio/xfs-fio_fat_rates-1-3.1.0+
38.23 +22.7% 46.92 fat/thresh=1000M/xfs-100dd-1-3.1.0+
45.17 +22.6% 55.39 fat/thresh=1000M/xfs-10dd-1-3.1.0+
51.66 +9.2% 56.44 fat/thresh=1000M/xfs-1dd-1-3.1.0+
38.31 +23.2% 47.18 fat/thresh=1000M:990M/xfs-100dd-1-3.1.0+
43.60 +26.1% 54.99 fat/thresh=1000M:990M/xfs-10dd-1-3.1.0+
50.14 +14.4% 57.39 fat/thresh=1000M:990M/xfs-1dd-1-3.1.0+
38.06 +26.8% 48.26 fat/thresh=1000M:999M/xfs-100dd-1-3.1.0+
42.43 +28.1% 54.34 fat/thresh=1000M:999M/xfs-10dd-1-3.1.0+
50.30 +10.4% 55.53 fat/thresh=1000M:999M/xfs-1dd-1-3.1.0+
28.89 -3.9% 27.76 fat/thresh=100M/xfs-100dd-1-3.1.0+
44.94 +3.6% 46.54 fat/thresh=100M/xfs-10dd-1-3.1.0+
55.60 -3.0% 53.95 fat/thresh=100M/xfs-1dd-1-3.1.0+
37.05 -15.2% 31.43 fat/thresh=10M/xfs-10dd-1-3.1.0+
55.42 +1.1% 56.03 fat/thresh=10M/xfs-1dd-1-3.1.0+
41.64 -30.3% 29.00 fat/thresh=1M/xfs-10dd-1-3.1.0+
56.68 -4.5% 54.14 fat/thresh=1M/xfs-1dd-1-3.1.0+
977.98 +8.3% 1059.05 TOTAL write_bw
wfg@bee /export/writeback% ./compare -g btrfs fat/*/*-3.1.0+ fat/*/*-3.2.0-rc3
3.1.0+ 3.2.0-rc3
------------------------ ------------------------
53.49 +19.6% 63.98 fat/UKEY-HDD/btrfs-100dd-1-3.1.0+
56.50 +11.8% 63.19 fat/UKEY-HDD/btrfs-10dd-1-3.1.0+
60.07 +6.3% 63.83 fat/UKEY-HDD/btrfs-1dd-1-3.1.0+
4.81 +26.8% 6.10 fat/UKEY-thresh=100M/btrfs-100dd-1-3.1.0+
5.00 +23.2% 6.16 fat/UKEY-thresh=100M/btrfs-10dd-1-3.1.0+
5.99 +1.8% 6.10 fat/UKEY-thresh=100M/btrfs-1dd-1-3.1.0+
15.98 -10.6% 14.29 fat/fio/btrfs-fio_fat_mmap_randwrite_4k-1-3.1.0+
52.02 +5.4% 54.85 fat/fio/btrfs-fio_fat_mmap_randwrite_64k-1-3.1.0+
56.01 +2.6% 57.48 fat/fio/btrfs-fio_fat_rates-1-3.1.0+
52.42 +10.4% 57.85 fat/thresh=1000M/btrfs-100dd-1-3.1.0+
53.75 +7.7% 57.86 fat/thresh=1000M/btrfs-10dd-1-3.1.0+
53.23 +11.2% 59.18 fat/thresh=1000M/btrfs-1dd-1-3.1.0+
55.11 +5.3% 58.02 fat/thresh=1000M:990M/btrfs-100dd-1-3.1.0+
53.01 +5.3% 55.83 fat/thresh=1000M:990M/btrfs-10dd-1-3.1.0+
55.71 +5.9% 58.97 fat/thresh=1000M:990M/btrfs-1dd-1-3.1.0+
54.07 +6.5% 57.61 fat/thresh=1000M:999M/btrfs-100dd-1-3.1.0+
53.05 +4.1% 55.21 fat/thresh=1000M:999M/btrfs-10dd-1-3.1.0+
54.79 +5.6% 57.85 fat/thresh=1000M:999M/btrfs-1dd-1-3.1.0+
56.42 +2.9% 58.06 fat/thresh=100M/btrfs-100dd-1-3.1.0+
57.41 +1.5% 58.26 fat/thresh=100M/btrfs-10dd-1-3.1.0+
58.12 +4.1% 60.50 fat/thresh=100M/btrfs-1dd-1-3.1.0+
44.41 +29.2% 57.37 fat/thresh=10M/btrfs-10dd-1-3.1.0+
54.33 +9.3% 59.37 fat/thresh=10M/btrfs-1dd-1-3.1.0+
5.00 -47.3% 2.64 fat/thresh=1M/btrfs-10dd-1-3.1.0+
15.21 -83.6% 2.50 fat/thresh=1M/btrfs-1dd-1-3.1.0+
1085.90 +6.2% 1153.08 TOTAL write_bw
It performs roughly the same with the pending writeback changes:
wfg@bee /export/writeback% ./compare -g xfs fat/*/*-3.1.0+ fat/*/*-3.2.0-rc3-pause6+
3.1.0+ 3.2.0-rc3-pause6+
------------------------ ------------------------
43.24 +9.2% 47.21 fat/UKEY-HDD/xfs-100dd-1-3.1.0+
51.35 +8.9% 55.90 fat/UKEY-HDD/xfs-10dd-1-3.1.0+
58.73 +5.8% 62.15 fat/UKEY-HDD/xfs-1dd-1-3.1.0+
4.17 -33.1% 2.79 fat/UKEY-thresh=100M/xfs-100dd-1-3.1.0+
4.14 -23.9% 3.15 fat/UKEY-thresh=100M/xfs-10dd-1-3.1.0+
6.30 +0.2% 6.32 fat/UKEY-thresh=100M/xfs-1dd-1-3.1.0+
8.88 +10.2% 9.78 fat/fio/xfs-fio_fat_mmap_randwrite_4k-1-3.1.0+
36.01 +24.4% 44.80 fat/fio/xfs-fio_fat_mmap_randwrite_64k-1-3.1.0+
47.04 +11.9% 52.64 fat/fio/xfs-fio_fat_rates-1-3.1.0+
38.23 +27.9% 48.89 fat/thresh=1000M/xfs-100dd-1-3.1.0+
45.17 +21.0% 54.67 fat/thresh=1000M/xfs-10dd-1-3.1.0+
51.66 +11.2% 57.46 fat/thresh=1000M/xfs-1dd-1-3.1.0+
38.31 +15.1% 44.08 fat/thresh=1000M:990M/xfs-100dd-1-3.1.0+
43.60 +24.8% 54.41 fat/thresh=1000M:990M/xfs-10dd-1-3.1.0+
50.14 +13.4% 56.87 fat/thresh=1000M:990M/xfs-1dd-1-3.1.0+
38.06 +28.9% 49.05 fat/thresh=1000M:999M/xfs-100dd-1-3.1.0+
42.43 +28.3% 54.41 fat/thresh=1000M:999M/xfs-10dd-1-3.1.0+
50.30 +8.1% 54.36 fat/thresh=1000M:999M/xfs-1dd-1-3.1.0+
28.89 -1.2% 28.55 fat/thresh=100M/xfs-100dd-1-3.1.0+
44.94 +5.3% 47.33 fat/thresh=100M/xfs-10dd-1-3.1.0+
55.60 +3.4% 57.48 fat/thresh=100M/xfs-1dd-1-3.1.0+
37.05 -14.5% 31.68 fat/thresh=10M/xfs-10dd-1-3.1.0+
55.42 +0.6% 55.77 fat/thresh=10M/xfs-1dd-1-3.1.0+
41.64 -30.8% 28.82 fat/thresh=1M/xfs-10dd-1-3.1.0+
56.68 -3.0% 54.98 fat/thresh=1M/xfs-1dd-1-3.1.0+
977.98 +8.7% 1063.55 TOTAL write_bw
wfg@bee /export/writeback% ./compare -g btrfs fat/*/*-{3.1.0+,3.2.0-rc3-pause6+}
3.1.0+ 3.2.0-rc3-pause6+
------------------------ ------------------------
53.49 +19.2% 63.75 fat/UKEY-HDD/btrfs-100dd-1-3.1.0+
56.50 +14.1% 64.49 fat/UKEY-HDD/btrfs-10dd-1-3.1.0+
60.07 +6.7% 64.11 fat/UKEY-HDD/btrfs-1dd-1-3.1.0+
4.81 +27.4% 6.12 fat/UKEY-thresh=100M/btrfs-100dd-1-3.1.0+
5.00 +21.7% 6.09 fat/UKEY-thresh=100M/btrfs-10dd-1-3.1.0+
5.99 +1.9% 6.11 fat/UKEY-thresh=100M/btrfs-1dd-1-3.1.0+
15.98 -8.5% 14.62 fat/fio/btrfs-fio_fat_mmap_randwrite_4k-1-3.1.0+
52.02 +4.2% 54.20 fat/fio/btrfs-fio_fat_mmap_randwrite_64k-1-3.1.0+
56.01 +1.0% 56.57 fat/fio/btrfs-fio_fat_rates-1-3.1.0+
52.42 +11.4% 58.38 fat/thresh=1000M/btrfs-100dd-1-3.1.0+
53.75 +9.2% 58.67 fat/thresh=1000M/btrfs-10dd-1-3.1.0+
53.23 +9.6% 58.34 fat/thresh=1000M/btrfs-1dd-1-3.1.0+
55.11 +5.8% 58.33 fat/thresh=1000M:990M/btrfs-100dd-1-3.1.0+
53.01 +6.8% 56.62 fat/thresh=1000M:990M/btrfs-10dd-1-3.1.0+
55.71 +3.8% 57.84 fat/thresh=1000M:990M/btrfs-1dd-1-3.1.0+
54.07 +6.9% 57.78 fat/thresh=1000M:999M/btrfs-100dd-1-3.1.0+
53.05 +5.3% 55.87 fat/thresh=1000M:999M/btrfs-10dd-1-3.1.0+
54.79 +4.2% 57.09 fat/thresh=1000M:999M/btrfs-1dd-1-3.1.0+
56.42 +2.7% 57.97 fat/thresh=100M/btrfs-100dd-1-3.1.0+
57.41 +1.9% 58.51 fat/thresh=100M/btrfs-10dd-1-3.1.0+
58.12 +1.0% 58.71 fat/thresh=100M/btrfs-1dd-1-3.1.0+
44.41 +31.0% 58.16 fat/thresh=10M/btrfs-10dd-1-3.1.0+
54.33 +7.9% 58.60 fat/thresh=10M/btrfs-1dd-1-3.1.0+
5.00 -55.3% 2.24 fat/thresh=1M/btrfs-10dd-1-3.1.0+
15.21 -81.0% 2.89 fat/thresh=1M/btrfs-1dd-1-3.1.0+
1085.90 +6.1% 1152.06 TOTAL write_bw
Thanks,
Fengguang
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