dt7, no moving target wfg ~% s fat [ 255 ] :-( Linux fat 2.6.39-rc3-dt7+ #235 SMP Tue Apr 19 19:33:15 CST 2011 x86_64 The programs included with the Debian GNU/Linux system are free software; the exact distribution terms for each program are described in the individual files in /usr/share/doc/*/copyright. Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. No mail. Last login: Tue Apr 19 19:16:05 2011 from 10.255.20.73 wfg@fat ~% su root@fat /home/wfg# for i in 1 2 3 4 5; do bin/test-tar-dd.sh; sleep 3; done umount: /dev/sda7: not mounted meta-data=/dev/sda7 isize=256 agcount=4, agsize=6170464 blks = sectsz=512 attr=2 data = bsize=4096 blocks=24681856, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal log bsize=4096 blocks=12051, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 306.70 2423.01 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 15.2306 s, 68.8 MB/s dd if=/dev/zero of=/fs/zero bs=1M count=1000 0.00s user 1.25s system 8% cpu 15.258 total tar jxf /dev/shm/linux-2.6.38.3.tar.bz2 12.42s user 4.17s system 57% cpu 28.688 total 344.05 2662.47 meta-data=/dev/sda7 isize=256 agcount=4, agsize=6170464 blks = sectsz=512 attr=2 data = bsize=4096 blocks=24681856, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal log bsize=4096 blocks=12051, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 351.63 2721.77 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 14.1873 s, 73.9 MB/s dd if=/dev/zero of=/fs/zero bs=1M count=1000 0.00s user 1.26s system 8% cpu 14.255 total tar jxf /dev/shm/linux-2.6.38.3.tar.bz2 12.67s user 4.04s system 58% cpu 28.738 total 388.94 2963.14 meta-data=/dev/sda7 isize=256 agcount=4, agsize=6170464 blks = sectsz=512 attr=2 data = bsize=4096 blocks=24681856, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal log bsize=4096 blocks=12051, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 396.53 3024.20 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 14.385 s, 72.9 MB/s dd if=/dev/zero of=/fs/zero bs=1M count=1000 0.00s user 1.26s system 8% cpu 14.443 total tar jxf /dev/shm/linux-2.6.38.3.tar.bz2 12.53s user 4.50s system 58% cpu 29.287 total 434.18 3268.86 meta-data=/dev/sda7 isize=256 agcount=4, agsize=6170464 blks = sectsz=512 attr=2 data = bsize=4096 blocks=24681856, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal log bsize=4096 blocks=12051, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 441.69 3327.58 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 13.997 s, 74.9 MB/s dd if=/dev/zero of=/fs/zero bs=1M count=1000 0.00s user 1.25s system 8% cpu 14.051 total tar jxf /dev/shm/linux-2.6.38.3.tar.bz2 12.38s user 4.28s system 57% cpu 28.861 total 478.91 3569.24 meta-data=/dev/sda7 isize=256 agcount=4, agsize=6170464 blks = sectsz=512 attr=2 data = bsize=4096 blocks=24681856, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal log bsize=4096 blocks=12051, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 486.48 3627.06 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 14.5851 s, 71.9 MB/s dd if=/dev/zero of=/fs/zero bs=1M count=1000 0.00s user 1.27s system 8% cpu 14.648 total tar jxf /dev/shm/linux-2.6.38.3.tar.bz2 12.44s user 4.19s system 56% cpu 29.443 total 524.46 3871.42 3871.42 - 3627.06 = 244.36 ext4: 1855.48 14403.91 tar jxf /dev/shm/linux-2.6.38.3.tar.bz2 12.48s user 3.31s system 86% cpu 18.345 total 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB) copied, 20.4943 s, 51.2 MB/s dd if=/dev/zero of=/fs/zero bs=1M count=1000 0.00s user 1.65s system 8% cpu 20.518 total 1884.20 14562.35 14562.35 - 14403.91 = 158.44