On Wed, Aug 18, 2010 at 12:49:05PM +0200, Morten P.D. Stevens wrote: > Hi, > > i can confirm this issue with poor create and delete performance. > > For example with unpacking and deleting the linux kernel: > > Btrfs: > > [r...@fc13 btrfs]# time tar xfj linux-2.6.36-rc1.tar.bz2 > > real 0m18.794s > user 0m12.045s > sys 0m8.241s > [r...@fc13 btrfs]# time rm -rf linux-2.6.36-rc1 > > real 0m2.156s > user 0m0.028s > sys 0m2.118s > > ext4: > > [r...@fc13 ext4]# time tar xfj linux-2.6.36-rc1.tar.bz2 > > real 0m13.140s > user 0m9.074s > sys 0m6.327s > [r...@fc13 ext4]# time rm -rf linux-2.6.36-rc1 > > real 0m0.781s > user 0m0.031s > sys 0m0.735s > > In all of our benchmarks, ext4 is still faster than btrfs.
For this kind of benchmark, I use my compilebench program. We want to time just the file creation and not how long it takes to uncompress or read in the .tar.gz from the disk. The results from 2.6.35 on a single sata drive are not good for ext4 at all. Btrfs is on par with where it always has been, but I'm experimenting with other benchmarks to find the regression. Basically when you are benchmarking this kind of thing you want to make sure you're benchmarking how quickly you can write to the disk, and not to cache. compilebench simulates this by creating files with the same size and names as what you get from untarring kernel trees, and then it has a phase where it creates files with the same size and names as the .o files from compiling the kernel. Btrfs: # ./compilebench -i 30 --makej creating /mnt/default using working directory /mnt/default, 30 intial dirs 100 runs native unpatched native-0 222MB in 1.76 seconds (126.35 MB/s) native patched native-0 109MB in 0.51 seconds (215.04 MB/s) native patched compiled native-0 691MB in 5.69 seconds (121.55 MB/s) create dir kernel-0 222MB in 2.94 seconds (75.64 MB/s) create dir kernel-1 222MB in 3.16 seconds (70.37 MB/s) create dir kernel-2 222MB in 3.05 seconds (72.91 MB/s) create dir kernel-3 222MB in 3.11 seconds (71.50 MB/s) create dir kernel-4 222MB in 3.88 seconds (57.31 MB/s) create dir kernel-5 222MB in 3.58 seconds (62.12 MB/s) create dir kernel-6 222MB in 6.11 seconds (36.40 MB/s) create dir kernel-7 222MB in 2.28 seconds (97.53 MB/s) create dir kernel-8 222MB in 3.12 seconds (71.27 MB/s) create dir kernel-9 222MB in 2.86 seconds (77.75 MB/s) create dir kernel-10 222MB in 4.46 seconds (49.86 MB/s) create dir kernel-11 222MB in 2.96 seconds (75.13 MB/s) create dir kernel-12 222MB in 3.86 seconds (57.61 MB/s) create dir kernel-13 222MB in 3.96 seconds (56.16 MB/s) create dir kernel-14 222MB in 3.79 seconds (58.67 MB/s) create dir kernel-15 222MB in 6.58 seconds (33.80 MB/s) create dir kernel-16 222MB in 2.09 seconds (106.40 MB/s) create dir kernel-17 222MB in 2.71 seconds (82.06 MB/s) create dir kernel-18 222MB in 3.40 seconds (65.40 MB/s) create dir kernel-19 222MB in 3.25 seconds (68.42 MB/s) create dir kernel-20 222MB in 3.79 seconds (58.67 MB/s) create dir kernel-21 222MB in 3.86 seconds (57.61 MB/s) create dir kernel-22 222MB in 3.59 seconds (61.94 MB/s) create dir kernel-23 222MB in 4.02 seconds (55.32 MB/s) create dir kernel-24 222MB in 7.68 seconds (28.95 MB/s) create dir kernel-25 222MB in 1.99 seconds (111.75 MB/s) create dir kernel-26 222MB in 2.77 seconds (80.28 MB/s) create dir kernel-27 222MB in 2.97 seconds (74.87 MB/s) create dir kernel-28 222MB in 3.22 seconds (69.06 MB/s) create dir kernel-29 222MB in 3.94 seconds (56.44 MB/s) compile dir kernel-6 680MB in 3.78 seconds (180.06 MB/s) compile dir kernel-29 680MB in 9.21 seconds (73.90 MB/s) compile dir kernel-11 680MB in 9.38 seconds (72.56 MB/s) compile dir kernel-22 680MB in 10.57 seconds (64.39 MB/s) compile dir kernel-15 680MB in 7.68 seconds (88.62 MB/s) compile dir kernel-13 680MB in 9.26 seconds (73.50 MB/s) compile dir kernel-17 680MB in 9.44 seconds (72.10 MB/s) compile dir kernel-3 680MB in 9.03 seconds (75.37 MB/s) compile dir kernel-10 680MB in 9.30 seconds (73.19 MB/s) compile dir kernel-12 680MB in 9.29 seconds (73.27 MB/s) compile dir kernel-27 680MB in 10.84 seconds (62.79 MB/s) compile dir kernel-14 680MB in 7.65 seconds (88.97 MB/s) compile dir kernel-9 680MB in 9.55 seconds (71.27 MB/s) compile dir kernel-4 680MB in 9.20 seconds (73.98 MB/s) compile dir kernel-0 680MB in 12.06 seconds (56.44 MB/s) compile dir kernel-23 680MB in 9.39 seconds (72.49 MB/s) compile dir kernel-1 680MB in 9.06 seconds (75.13 MB/s) Ext4: ./compilebench -i 30 --makej creating /mnt/default using working directory /mnt/default, 30 intial dirs 100 runs native unpatched native-0 222MB in 1.11 seconds (200.34 MB/s) native patched native-0 109MB in 0.33 seconds (332.33 MB/s) native patched compiled native-0 691MB in 5.38 seconds (128.55 MB/s) create dir kernel-0 222MB in 1.05 seconds (211.78 MB/s) create dir kernel-1 222MB in 4.60 seconds (48.34 MB/s) create dir kernel-2 222MB in 4.30 seconds (51.71 MB/s) create dir kernel-3 222MB in 5.71 seconds (38.94 MB/s) create dir kernel-4 222MB in 4.82 seconds (46.14 MB/s) create dir kernel-5 222MB in 4.91 seconds (45.29 MB/s) create dir kernel-6 222MB in 5.70 seconds (39.01 MB/s) create dir kernel-7 222MB in 4.76 seconds (46.72 MB/s) create dir kernel-8 222MB in 6.40 seconds (34.75 MB/s) create dir kernel-9 222MB in 5.37 seconds (41.41 MB/s) create dir kernel-10 222MB in 5.51 seconds (40.36 MB/s) create dir kernel-11 222MB in 6.77 seconds (32.85 MB/s) create dir kernel-12 222MB in 5.88 seconds (37.82 MB/s) create dir kernel-13 222MB in 8.92 seconds (24.93 MB/s) create dir kernel-14 222MB in 5.44 seconds (40.88 MB/s) create dir kernel-15 222MB in 6.21 seconds (35.81 MB/s) create dir kernel-16 222MB in 4.85 seconds (45.85 MB/s) create dir kernel-17 222MB in 8.83 seconds (25.18 MB/s) create dir kernel-18 222MB in 6.82 seconds (32.61 MB/s) create dir kernel-19 222MB in 4.86 seconds (45.76 MB/s) create dir kernel-20 222MB in 10.48 seconds (21.22 MB/s) create dir kernel-21 222MB in 4.85 seconds (45.85 MB/s) create dir kernel-22 222MB in 8.30 seconds (26.79 MB/s) create dir kernel-23 222MB in 6.38 seconds (34.85 MB/s) create dir kernel-24 222MB in 7.30 seconds (30.46 MB/s) create dir kernel-25 222MB in 3.83 seconds (58.06 MB/s) create dir kernel-26 222MB in 9.70 seconds (22.93 MB/s) create dir kernel-27 222MB in 5.39 seconds (41.26 MB/s) create dir kernel-28 222MB in 6.96 seconds (31.95 MB/s) create dir kernel-29 222MB in 8.16 seconds (27.25 MB/s) compile dir kernel-6 680MB in 7.47 seconds (91.12 MB/s) compile dir kernel-29 680MB in 16.37 seconds (41.58 MB/s) compile dir kernel-11 680MB in 19.57 seconds (34.78 MB/s) compile dir kernel-22 680MB in 17.17 seconds (39.64 MB/s) compile dir kernel-15 680MB in 17.40 seconds (39.12 MB/s) compile dir kernel-13 680MB in 17.87 seconds (38.09 MB/s) compile dir kernel-17 680MB in 18.14 seconds (37.52 MB/s) compile dir kernel-3 680MB in 17.43 seconds (39.05 MB/s) compile dir kernel-10 680MB in 15.18 seconds (44.84 MB/s) compile dir kernel-12 680MB in 17.14 seconds (39.71 MB/s) compile dir kernel-27 680MB in 18.71 seconds (36.38 MB/s) compile dir kernel-14 680MB in 17.47 seconds (38.96 MB/s) compile dir kernel-9 680MB in 19.76 seconds (34.45 MB/s) compile dir kernel-4 680MB in 17.53 seconds (38.83 MB/s) compile dir kernel-0 680MB in 17.20 seconds (39.57 MB/s) compile dir kernel-23 680MB in 17.31 seconds (39.32 MB/s) compile dir kernel-1 680MB in 18.19 seconds (37.42 MB/s) -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in 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