Hi Jan,
The test results look not good: btrfs is heavily impacted and the
other filesystems are slightly impacted.
I'll send you the detailed logs in private emails (too large for the
mailing list). Basically I noticed many writeback_wait traces that
never appear w/o this patch. In the btrfs cases that see larger
regressions, I see large fluctuations in the writeout bandwidth and
long disk idle periods. It's still a bit puzzling how all these
happen..
3.1.0-rc8-ioless6+ 3.1.0-rc8-ioless6-requeue+
------------------------ ------------------------
59.39 -82.9% 10.13 thresh=100M/btrfs-10dd-4k-8p-4096M-100M:10-X
58.68 -80.3% 11.54 thresh=100M/btrfs-1dd-4k-8p-4096M-100M:10-X
58.92 -80.0% 11.76 thresh=100M/btrfs-2dd-4k-8p-4096M-100M:10-X
38.02 -1.0% 37.65 thresh=100M/ext3-10dd-4k-8p-4096M-100M:10-X
45.20 +1.7% 45.96 thresh=100M/ext3-1dd-4k-8p-4096M-100M:10-X
42.50 -0.8% 42.14 thresh=100M/ext3-2dd-4k-8p-4096M-100M:10-X
47.50 -2.5% 46.32 thresh=100M/ext4-10dd-4k-8p-4096M-100M:10-X
58.18 -3.0% 56.41 thresh=100M/ext4-1dd-4k-8p-4096M-100M:10-X
55.79 -2.1% 54.63 thresh=100M/ext4-2dd-4k-8p-4096M-100M:10-X
44.89 -19.3% 36.23 thresh=100M/xfs-10dd-4k-8p-4096M-100M:10-X
58.06 -4.2% 55.64 thresh=100M/xfs-1dd-4k-8p-4096M-100M:10-X
51.94 -1.1% 51.35 thresh=100M/xfs-2dd-4k-8p-4096M-100M:10-X
60.29 -35.9% 38.63 thresh=1G/btrfs-100dd-4k-8p-4096M-1024M:10-X
58.80 -33.2% 39.25 thresh=1G/btrfs-10dd-4k-8p-4096M-1024M:10-X
58.53 -21.5% 45.93 thresh=1G/btrfs-1dd-4k-8p-4096M-1024M:10-X
31.96 -4.7% 30.44 thresh=1G/ext3-100dd-4k-8p-4096M-1024M:10-X
36.19 -1.0% 35.82 thresh=1G/ext3-10dd-4k-8p-4096M-1024M:10-X
45.03 -2.7% 43.80 thresh=1G/ext3-1dd-4k-8p-4096M-1024M:10-X
51.47 -2.6% 50.14 thresh=1G/ext4-100dd-4k-8p-4096M-1024M:10-X
56.19 -1.0% 55.64 thresh=1G/ext4-10dd-4k-8p-4096M-1024M:10-X
58.41 -1.0% 57.84 thresh=1G/ext4-1dd-4k-8p-4096M-1024M:10-X
43.44 -8.4% 39.77 thresh=1G/xfs-100dd-4k-8p-4096M-1024M:10-X
49.83 -3.3% 48.18 thresh=1G/xfs-10dd-4k-8p-4096M-1024M:10-X
52.70 -0.8% 52.26 thresh=1G/xfs-1dd-4k-8p-4096M-1024M:10-X
57.12 -85.5% 8.27 thresh=8M/btrfs-10dd-4k-8p-4096M-8M:10-X
59.29 -84.7% 9.05 thresh=8M/btrfs-1dd-4k-8p-4096M-8M:10-X
59.23 -84.9% 8.97 thresh=8M/btrfs-2dd-4k-8p-4096M-8M:10-X
33.63 -3.3% 32.51 thresh=8M/ext3-10dd-4k-8p-4096M-8M:10-X
48.30 -4.7% 46.03 thresh=8M/ext3-1dd-4k-8p-4096M-8M:10-X
46.77 -4.5% 44.69 thresh=8M/ext3-2dd-4k-8p-4096M-8M:10-X
36.58 -2.2% 35.77 thresh=8M/ext4-10dd-4k-8p-4096M-8M:10-X
57.35 -0.3% 57.16 thresh=8M/ext4-1dd-4k-8p-4096M-8M:10-X
52.82 -1.5% 52.04 thresh=8M/ext4-2dd-4k-8p-4096M-8M:10-X
32.19 -4.5% 30.74 thresh=8M/xfs-10dd-4k-8p-4096M-8M:10-X
55.86 -1.4% 55.09 thresh=8M/xfs-1dd-4k-8p-4096M-8M:10-X
48.96 -33.1% 32.74 thresh=8M/xfs-2dd-4k-8p-4096M-8M:10-X
1810.02 -22.1% 1410.49 TOTAL
Thanks,
Fengguang
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