On Mon, Oct 03, 2011 at 09:42:28PM +0800, Wu, Fengguang wrote: > Hi, > > This is the minimal IO-less balance_dirty_pages() changes that are expected to > be regression free (well, except for NFS). > > git://github.com/fengguang/linux.git dirty-throttling-v12 > > Tests results will be posted in a separate email. The complete test matrix for the major filesystems would take some more days to complete. As far as I can tell from the current test results, the writeback performance mostly stays on par with vanilla 3.1 kernel except for -14% regression on average for NFS, which can be cut down to -7% by limiting the commit size. USB stick: 3.1.0-rc4-vanilla+ 3.1.0-rc8-ioless6+ ------------------------ ------------------------ 54.39 +0.6% 54.73 3G-UKEY-HDD/xfs-10dd-4k-8p-4096M-20:10-X 63.72 -1.8% 62.58 3G-UKEY-HDD/xfs-1dd-4k-8p-4096M-20:10-X 58.53 -3.2% 56.65 3G-UKEY-HDD/xfs-2dd-4k-8p-4096M-20:10-X 6.31 +1.6% 6.41 UKEY-thresh=50M/xfs-1dd-4k-8p-4096M-50M:10-X 4.91 +0.9% 4.95 UKEY-thresh=50M/xfs-2dd-4k-8p-4096M-50M:10-X single disk: 3.1.0-rc4-vanilla+ 3.1.0-rc8-ioless6+ ------------------------ ------------------------ 47.59 -0.2% 47.50 thresh=100M/ext4-10dd-4k-8p-4096M-100M:10-X 56.83 +2.4% 58.18 thresh=100M/ext4-1dd-4k-8p-4096M-100M:10-X 54.81 +1.8% 55.79 thresh=100M/ext4-2dd-4k-8p-4096M-100M:10-X 45.89 -2.2% 44.89 thresh=100M/xfs-10dd-4k-8p-4096M-100M:10-X 56.68 +2.4% 58.06 thresh=100M/xfs-1dd-4k-8p-4096M-100M:10-X 53.33 -2.6% 51.94 thresh=100M/xfs-2dd-4k-8p-4096M-100M:10-X 89.22 +3.6% 92.40 thresh=1024M-1000M/xfs-10dd-1M-32p-32768M-1024M:1000M-X 93.01 -0.4% 92.65 thresh=1024M-1000M/xfs-1dd-1M-32p-32768M-1024M:1000M-X 91.19 -0.8% 90.46 thresh=1024M-1000M/xfs-2dd-1M-32p-32768M-1024M:1000M-X 58.23 +3.5% 60.29 thresh=1G/btrfs-100dd-4k-8p-4096M-1024M:10-X 57.53 +2.2% 58.80 thresh=1G/btrfs-10dd-4k-8p-4096M-1024M:10-X 57.18 +2.4% 58.53 thresh=1G/btrfs-1dd-4k-8p-4096M-1024M:10-X 35.97 -11.2% 31.96 thresh=1G/ext3-100dd-4k-8p-4096M-1024M:10-X 36.55 -1.0% 36.19 thresh=1G/ext3-10dd-4k-8p-4096M-1024M:10-X 44.94 +0.2% 45.03 thresh=1G/ext3-1dd-4k-8p-4096M-1024M:10-X 53.25 -3.3% 51.47 thresh=1G/ext4-100dd-4k-8p-4096M-1024M:10-X 56.17 +0.0% 56.19 thresh=1G/ext4-10dd-4k-8p-4096M-1024M:10-X 58.11 +0.5% 58.41 thresh=1G/ext4-1dd-4k-8p-4096M-1024M:10-X 41.93 +3.6% 43.44 thresh=1G/xfs-100dd-4k-8p-4096M-1024M:10-X 46.34 +7.5% 49.83 thresh=1G/xfs-10dd-4k-8p-4096M-1024M:10-X 52.67 +0.1% 52.70 thresh=1G/xfs-1dd-4k-8p-4096M-1024M:10-X 25.28 +10.4% 27.91 thresh=1M/xfs-10dd-4k-8p-4096M-1M:10-X 31.56 +60.3% 50.61 thresh=1M/xfs-1dd-4k-8p-4096M-1M:10-X 43.89 -2.5% 42.81 thresh=1M/xfs-2dd-4k-8p-4096M-1M:10-X 86.10 +25.7% 108.19 thresh=2048M-2000M/xfs-10dd-1M-32p-32768M-2048M:2000M-X 93.31 -1.7% 91.69 thresh=2048M-2000M/xfs-1dd-1M-32p-32768M-2048M:2000M-X 90.52 +0.2% 90.72 thresh=2048M-2000M/xfs-2dd-1M-32p-32768M-2048M:2000M-X 48.57 +4.6% 50.82 thresh=400M-300M/xfs-10dd-4k-8p-4096M-400M:300M-X 55.00 +2.4% 56.33 thresh=400M-300M/xfs-1dd-4k-8p-4096M-400M:300M-X 52.41 +1.6% 53.27 thresh=400M-300M/xfs-2dd-4k-8p-4096M-400M:300M-X 50.78 +1.8% 51.67 thresh=400M/xfs-10dd-4k-8p-4096M-400M:10-X 57.48 -0.2% 57.35 thresh=400M/xfs-1dd-4k-8p-4096M-400M:10-X 54.14 -1.4% 53.36 thresh=400M/xfs-2dd-4k-8p-4096M-400M:10-X 81.43 +11.0% 90.41 thresh=8G/xfs-100dd-1M-32p-32768M-8192M:10-X 87.37 +4.9% 91.67 thresh=8G/xfs-10dd-1M-32p-32768M-8192M:10-X 92.58 +1.0% 93.51 thresh=8G/xfs-1dd-1M-32p-32768M-8192M:10-X 89.78 +3.3% 92.76 thresh=8G/xfs-2dd-1M-32p-32768M-8192M:10-X 25.00 +28.7% 32.19 thresh=8M/xfs-10dd-4k-8p-4096M-8M:10-X 54.37 +2.7% 55.86 thresh=8M/xfs-1dd-4k-8p-4096M-8M:10-X 43.26 +13.2% 48.96 thresh=8M/xfs-2dd-4k-8p-4096M-8M:10-X 2350.25 +3.6% 2434.78 TOTAL single disk, different dd block sizes: 3.1.0-rc4-vanilla+ 3.1.0-rc8-ioless6+ ------------------------ ------------------------ 40.88 +6.8% 43.65 3G-bs=1M/xfs-100dd-1M-8p-4096M-20:10-X 49.31 +1.3% 49.95 3G-bs=1M/xfs-10dd-1M-8p-4096M-20:10-X 54.75 -0.2% 54.66 3G-bs=1M/xfs-1dd-1M-8p-4096M-20:10-X 39.65 -1.2% 39.18 3G-bs=1k/xfs-100dd-1k-8p-4096M-20:10-X 48.08 +0.3% 48.21 3G-bs=1k/xfs-10dd-1k-8p-4096M-20:10-X 52.76 -0.3% 52.60 3G-bs=1k/xfs-1dd-1k-8p-4096M-20:10-X 40.60 +7.4% 43.60 3G/xfs-100dd-4k-8p-4096M-20:10-X 49.56 +1.9% 50.49 3G/xfs-10dd-4k-8p-4096M-20:10-X 53.90 +0.1% 53.95 3G/xfs-1dd-4k-8p-4096M-20:10-X JBOD: 3.1.0-rc4-vanilla+ 3.1.0-rc8-ioless6+ ------------------------ ------------------------ 653.81 -1.7% 642.93 JBOD-10HDD-16G/xfs-100dd-1M-24p-16384M-20:10-X 660.44 -0.5% 657.40 JBOD-10HDD-16G/xfs-10dd-1M-24p-16384M-20:10-X 651.53 +3.8% 676.56 JBOD-10HDD-16G/xfs-1dd-1M-24p-16384M-20:10-X 330.97 +1.4% 335.62 JBOD-10HDD-6G/ext4-100dd-1M-16p-8192M-20:10-X 376.51 +0.3% 377.73 JBOD-10HDD-6G/ext4-10dd-1M-16p-8192M-20:10-X 392.36 -1.6% 385.96 JBOD-10HDD-6G/ext4-1dd-1M-16p-8192M-20:10-X 390.44 -0.7% 387.56 JBOD-10HDD-6G/ext4-2dd-1M-16p-8192M-20:10-X 270.08 +2.1% 275.78 JBOD-10HDD-thresh=100M/ext4-100dd-1M-16p-8192M-100M:10-X 325.17 +11.4% 362.32 JBOD-10HDD-thresh=100M/ext4-10dd-1M-16p-8192M-100M:10-X 379.30 +3.1% 391.19 JBOD-10HDD-thresh=100M/ext4-1dd-1M-16p-8192M-100M:10-X 351.38 +8.6% 381.60 JBOD-10HDD-thresh=100M/ext4-2dd-1M-16p-8192M-100M:10-X 351.03 -23.5% 268.55 JBOD-10HDD-thresh=100M/xfs-100dd-1M-24p-16384M-100M:10-X 411.98 +19.2% 491.25 JBOD-10HDD-thresh=100M/xfs-10dd-1M-24p-16384M-100M:10-X 502.51 +12.9% 567.37 JBOD-10HDD-thresh=100M/xfs-1dd-1M-24p-16384M-100M:10-X 345.61 +4.3% 360.62 JBOD-10HDD-thresh=2G/ext4-100dd-1M-16p-8192M-2048M:10-X 383.20 +0.2% 383.78 JBOD-10HDD-thresh=2G/ext4-10dd-1M-16p-8192M-2048M:10-X 393.46 -0.6% 391.27 JBOD-10HDD-thresh=2G/ext4-1dd-1M-16p-8192M-2048M:10-X 393.40 -0.9% 389.85 JBOD-10HDD-thresh=2G/ext4-2dd-1M-16p-8192M-2048M:10-X 646.70 -1.2% 638.68 JBOD-10HDD-thresh=2G/xfs-100dd-1M-24p-16384M-2048M:10-X 652.26 +2.2% 666.84 JBOD-10HDD-thresh=2G/xfs-10dd-1M-24p-16384M-2048M:10-X 642.60 +7.4% 690.19 JBOD-10HDD-thresh=2G/xfs-1dd-1M-24p-16384M-2048M:10-X 391.37 -3.7% 376.88 JBOD-10HDD-thresh=4G/ext4-10dd-1M-16p-8192M-4096M:10-X 395.83 -1.2% 390.90 JBOD-10HDD-thresh=4G/ext4-1dd-1M-16p-8192M-4096M:10-X 398.18 -1.7% 391.44 JBOD-10HDD-thresh=4G/ext4-2dd-1M-16p-8192M-4096M:10-X 665.94 -0.9% 659.95 JBOD-10HDD-thresh=4G/xfs-100dd-1M-24p-16384M-4096M:10-X 660.60 +0.0% 660.73 JBOD-10HDD-thresh=4G/xfs-10dd-1M-24p-16384M-4096M:10-X 655.92 +2.1% 669.58 JBOD-10HDD-thresh=4G/xfs-1dd-1M-24p-16384M-4096M:10-X 342.39 +1.4% 347.02 JBOD-10HDD-thresh=800M/ext4-100dd-1M-16p-8192M-800M:10-X 367.30 +1.0% 371.03 JBOD-10HDD-thresh=800M/ext4-10dd-1M-16p-8192M-800M:10-X 384.76 +0.4% 386.29 JBOD-10HDD-thresh=800M/ext4-1dd-1M-16p-8192M-800M:10-X 378.61 +2.4% 387.56 JBOD-10HDD-thresh=800M/ext4-2dd-1M-16p-8192M-800M:10-X 556.88 -1.2% 550.21 JBOD-10HDD-thresh=800M/xfs-100dd-1M-24p-16384M-800M:10-X 646.96 +2.7% 664.74 JBOD-10HDD-thresh=800M/xfs-10dd-1M-24p-16384M-800M:10-X 619.52 +13.2% 701.36 JBOD-10HDD-thresh=800M/xfs-1dd-1M-24p-16384M-800M:10-X 209.76 +5.8% 221.88 JBOD-2HDD-6G/xfs-100dd-1M-24p-16384M-20:10-X 222.62 +2.3% 227.69 JBOD-2HDD-6G/xfs-10dd-1M-24p-16384M-20:10-X 234.09 -1.5% 230.62 JBOD-2HDD-6G/xfs-1dd-1M-24p-16384M-20:10-X 146.22 -15.8% 123.06 JBOD-2HDD-thresh=100M/xfs-100dd-1M-24p-16384M-100M:10-X 204.93 +0.3% 205.48 JBOD-2HDD-thresh=100M/xfs-10dd-1M-24p-16384M-100M:10-X 205.06 +2.7% 210.52 JBOD-2HDD-thresh=100M/xfs-1dd-1M-24p-16384M-100M:10-X 120.58 -76.6% 28.19 JBOD-2HDD-thresh=10M/xfs-100dd-1M-24p-16384M-10M:10-X 73.11 +53.5% 112.25 JBOD-2HDD-thresh=10M/xfs-10dd-1M-24p-16384M-10M:10-X 98.99 +80.2% 178.38 JBOD-2HDD-thresh=10M/xfs-1dd-1M-24p-16384M-10M:10-X 340.86 -1.3% 336.28 JBOD-4HDD-6G/xfs-100dd-1M-24p-16384M-20:10-X 369.65 +4.2% 385.01 JBOD-4HDD-6G/xfs-10dd-1M-24p-16384M-20:10-X 424.24 -3.4% 410.01 JBOD-4HDD-6G/xfs-1dd-1M-24p-16384M-20:10-X 279.28 -19.6% 224.53 JBOD-4HDD-thresh=100M/xfs-100dd-1M-24p-16384M-100M:10-X 335.48 +11.6% 374.31 JBOD-4HDD-thresh=100M/xfs-10dd-1M-24p-16384M-100M:10-X 353.58 +9.0% 385.41 JBOD-4HDD-thresh=100M/xfs-1dd-1M-24p-16384M-100M:10-X 34.31 +0.3% 34.42 JBOD-MMAP-RANDWRITE-4K/ext4-fio_mmap_randwrite_4k-4k-16p-8192M-20:10-X 19621.76 +1.8% 19968.81 TOTAL software RAID0: 3.1.0-rc4-vanilla+ 3.1.0-rc8-ioless6+ ------------------------ ------------------------ 562.90 -2.3% 549.79 RAID0-10HDD-16G/xfs-1000dd-1M-24p-16384M-20:10-X 662.22 -0.5% 659.09 RAID0-10HDD-16G/xfs-100dd-1M-24p-16384M-20:10-X 645.99 +0.7% 650.40 RAID0-10HDD-16G/xfs-10dd-1M-24p-16384M-20:10-X 1871.12 -0.6% 1859.27 TOTAL NFS: 3.1.0-rc4-vanilla+ 3.1.0-rc8-ioless6+ ------------------------ ------------------------ 20.89 +7.4% 22.43 NFS-thresh=100M/nfs-10dd-1M-32p-32768M-100M:10-X 39.43 -28.5% 28.21 NFS-thresh=100M/nfs-1dd-1M-32p-32768M-100M:10-X 26.60 +9.8% 29.21 NFS-thresh=100M/nfs-2dd-1M-32p-32768M-100M:10-X 12.70 +11.2% 14.12 NFS-thresh=10M/nfs-10dd-1M-32p-32768M-10M:10-X 27.41 +7.4% 29.44 NFS-thresh=10M/nfs-1dd-1M-32p-32768M-10M:10-X 26.52 -65.7% 9.09 NFS-thresh=10M/nfs-2dd-1M-32p-32768M-10M:10-X 40.70 -36.9% 25.68 NFS-thresh=1G/nfs-10dd-1M-32p-32768M-1024M:10-X 45.28 -9.3% 41.06 NFS-thresh=1G/nfs-1dd-1M-32p-32768M-1024M:10-X 35.74 +9.5% 39.13 NFS-thresh=1G/nfs-2dd-1M-32p-32768M-1024M:10-X 2.89 +15.8% 3.35 NFS-thresh=1M/nfs-10dd-1M-32p-32768M-1M:10-X 6.69 -18.7% 5.44 NFS-thresh=1M/nfs-1dd-1M-32p-32768M-1M:10-X 7.16 -57.5% 3.04 NFS-thresh=1M/nfs-2dd-1M-32p-32768M-1M:10-X 292.02 -14.3% 250.21 TOTAL the NFS smooth patch may cut the regressions by half: 3.1.0-rc8-ioless6+ 3.1.0-rc4-nfs-smooth+ ------------------------ ------------------------ 22.43 +39.5% 31.30 NFS-thresh=100M/nfs-10dd-1M-32p-32768M-100M:10-X 28.21 -4.7% 26.87 NFS-thresh=100M/nfs-1dd-1M-32p-32768M-100M:10-X 29.21 +17.3% 34.28 NFS-thresh=100M/nfs-2dd-1M-32p-32768M-100M:10-X 14.12 -6.3% 13.23 NFS-thresh=10M/nfs-10dd-1M-32p-32768M-10M:10-X 29.44 -57.6% 12.48 NFS-thresh=10M/nfs-1dd-1M-32p-32768M-10M:10-X 9.09 +41.0% 12.81 NFS-thresh=10M/nfs-2dd-1M-32p-32768M-10M:10-X 25.68 +63.6% 42.01 NFS-thresh=1G/nfs-10dd-1M-32p-32768M-1024M:10-X 41.06 -7.5% 37.97 NFS-thresh=1G/nfs-1dd-1M-32p-32768M-1024M:10-X 39.13 +13.0% 44.21 NFS-thresh=1G/nfs-2dd-1M-32p-32768M-1024M:10-X 3.35 +2.2% 3.42 NFS-thresh=1M/nfs-10dd-1M-32p-32768M-1M:10-X 5.44 +37.0% 7.45 NFS-thresh=1M/nfs-1dd-1M-32p-32768M-1M:10-X 3.04 +21.9% 3.70 NFS-thresh=1M/nfs-2dd-1M-32p-32768M-1M:10-X 250.21 +7.8% 269.74 TOTAL Thanks, Fengguang -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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