Flashbench-results

flashbench-results@lists.linaro.org

16 participants
1687 discussions

by Andrew Bradford

andrew@brick:~/git/flashbench$ head /sys/block/mmcblk0/device/* 2>/dev/null | grep -v ^$ ==> /sys/block/mmcblk0/device/block <== ==> /sys/block/mmcblk0/device/cid <== 1b534d303030303010592232db00d600 ==> /sys/block/mmcblk0/device/csd <== 400e00325b5900003a917f800a400000 ==> /sys/block/mmcblk0/device/date <== 06/2013 ==> /sys/block/mmcblk0/device/driver <== ==> /sys/block/mmcblk0/device/erase_size <== 512 ==> /sys/block/mmcblk0/device/fwrev <== 0x0 ==> /sys/block/mmcblk0/device/hwrev <== 0x1 ==> /sys/block/mmcblk0/device/manfid <== 0x00001b ==> /sys/block/mmcblk0/device/name <== 00000 ==> /sys/block/mmcblk0/device/oemid <== 0x534d ==> /sys/block/mmcblk0/device/power <== ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 0235000000000000 ==> /sys/block/mmcblk0/device/serial <== 0x592232db ==> /sys/block/mmcblk0/device/subsystem <== ==> /sys/block/mmcblk0/device/type <== SD ==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=00000 MODALIAS=mmc:block andrew@brick:~/git/flashbench$ sudo fdisk -l /dev/mmcblk0 Disk /dev/mmcblk0: 7861 MB, 7861174272 bytes, 15353856 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/mmcblk0p1 8192 15353855 7672832 b W95 FAT32 andrew@brick:~/git/flashbench$ factor 7861174272 7861174272: 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 7 7 17 andrew@brick:~/git/flashbench$ sudo ./flashbench -a /dev/mmcblk0 --blocksize=1024 --count=100 align 2147483648 pre 391µs on 476µs post 453µs diff 54.1µs align 1073741824 pre 394µs on 478µs post 454µs diff 54.7µs align 536870912 pre 392µs on 477µs post 454µs diff 54µs align 268435456 pre 391µs on 476µs post 453µs diff 53.3µs align 134217728 pre 383µs on 460µs post 469µs diff 34.3µs align 67108864 pre 366µs on 444µs post 451µs diff 35.4µs align 33554432 pre 366µs on 443µs post 451µs diff 34.8µs align 16777216 pre 366µs on 444µs post 451µs diff 35.7µs align 8388608 pre 374µs on 463µs post 461µs diff 45.1µs align 4194304 pre 373µs on 466µs post 458µs diff 50.6µs align 2097152 pre 385µs on 480µs post 472µs diff 51µs align 1048576 pre 383µs on 481µs post 476µs diff 51.1µs align 524288 pre 383µs on 452µs post 471µs diff 24.5µs align 262144 pre 380µs on 451µs post 475µs diff 23.7µs align 131072 pre 383µs on 451µs post 471µs diff 24µs align 65536 pre 382µs on 451µs post 474µs diff 23.2µs align 32768 pre 384µs on 451µs post 469µs diff 24.6µs align 16384 pre 381µs on 451µs post 475µs diff 23µs align 8192 pre 379µs on 445µs post 465µs diff 22.8µs align 4096 pre 427µs on 422µs post 415µs diff 764ns align 2048 pre 450µs on 445µs post 439µs diff 671ns ## Looks like 1 MiB erase blocks andrew@brick:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --erasesize=$[1024*1024] --blocksize=$[8*1024] --open-au-nr=1 1MiB 2.94M/s 512KiB 4.96M/s 256KiB 7.78M/s 128KiB 8.53M/s 64KiB 4.25M/s 32KiB 3.16M/s 16KiB 6.13M/s 8KiB 4.25M/s andrew@brick:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --erasesize=$[1024*1024] --blocksize=$[8*1024] --open-au-nr=2 1MiB 2.51M/s 512KiB 8.78M/s 256KiB 8.7M/s 128KiB 8.74M/s 64KiB 8.64M/s 32KiB 8.2M/s 16KiB 6.77M/s 8KiB 4.27M/s andrew@brick:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --erasesize=$[1024*1024] --blocksize=$[8*1024] --open-au-nr=3 1MiB 1.67M/s 512KiB 1.63M/s 256KiB 1.07M/s 128KiB 517K/s 64KiB 397K/s 32KiB 366K/s 16KiB 364K/s 8KiB 2.61M/s ## 2 linear open-au andrew@brick:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --erasesize=$[1024*1024] --blocksize=$[8*1024] --random --open-au-nr=1 1MiB 1.51M/s 512KiB 7.85M/s 256KiB 8.61M/s 128KiB 1.66M/s 64KiB 7.54M/s 32KiB 7.97M/s 16KiB 6.51M/s 8KiB 4.09M/s andrew@brick:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --erasesize=$[1024*1024] --blocksize=$[8*1024] --random --open-au-nr=2 1MiB 8.72M/s 512KiB 8.81M/s 256KiB 8.55M/s 128KiB 8.71M/s 64KiB 8.59M/s 32KiB 8.15M/s 16KiB 6.5M/s 8KiB 4.13M/s andrew@brick:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --erasesize=$[1024*1024] --blocksize=$[8*1024] --random --open-au-nr=3 1MiB 1.7M/s 512KiB 1.31M/s 256KiB 936K/s 128KiB 635K/s 64KiB 384K/s 32KiB 360K/s 16KiB 364K/s 8KiB 2.15M/s ## 2 open-au random andrew@brick:~/git/flashbench$ sudo ./flashbench --find-fat --erasesize=$[1024*1024] /dev/mmcblk0 1MiB 5.03M/s 4.93M/s 4.92M/s 6.34M/s 7.43M/s 7.46M/s 512KiB 6.91M/s 6.23M/s 6.18M/s 5.04M/s 6.23M/s 6.25M/s 256KiB 5.06M/s 6.2M/s 6.25M/s 4.94M/s 6.14M/s 6.2M/s 128KiB 5.04M/s 6.19M/s 6.19M/s 4.99M/s 6.2M/s 6.23M/s 64KiB 4.95M/s 6.19M/s 6.12M/s 4.99M/s 6.15M/s 6.26M/s 32KiB 4.16M/s 4.89M/s 4.79M/s 5.79M/s 7.63M/s 8.41M/s 16KiB 6.57M/s 6.52M/s 6.57M/s 6.58M/s 6.52M/s 6.45M/s andrew@brick:~/git/flashbench$ sudo ./flashbench --find-fat --erasesize=$[1024*1024] --fat-nr=16 /dev/mmcblk0 1MiB 5.08M/s 4.94M/s 4.9M/s 6.36M/s 7.45M/s 7.57M/s 6.4M/s 6.03M/s 6.24M/s 5.44M/s 6.27M/s 6.17M/s 5.47M/s 6.25M/s 6.17M/s 5.36M/s 512KiB 6.04M/s 6.21M/s 7.21M/s 4.08M/s 2.82M/s 4.09M/s 4.64M/s 5.3M/s 6.04M/s 6.23M/s 5.46M/s 6.23M/s 6.19M/s 5.39M/s 6.26M/s 6.14M/s 256KiB 5.4M/s 6.27M/s 6.27M/s 3.85M/s 2.84M/s 4.02M/s 4.78M/s 5.17M/s 6.26M/s 6.21M/s 5.47M/s 6.17M/s 6.26M/s 5.4M/s 6.2M/s 6.27M/s 128KiB 4.66M/s 6.27M/s 6.21M/s 3.89M/s 2.79M/s 4.15M/s 4.71M/s 5.31M/s 6.19M/s 6.24M/s 5.46M/s 6.05M/s 6.25M/s 5.51M/s 6.24M/s 6.21M/s 64KiB 5.44M/s 6.24M/s 6.13M/s 3.79M/s 2.82M/s 4.06M/s 4.71M/s 5.26M/s 6.28M/s 6.27M/s 5.42M/s 6.21M/s 6.27M/s 5.45M/s 6.15M/s 6.24M/s 32KiB 4.38M/s 4.71M/s 4.83M/s 6.78M/s 8.47M/s 8.43M/s 8.44M/s 8.14M/s 8.28M/s 8.66M/s 8.85M/s 8.36M/s 3.9M/s 2.77M/s 4.15M/s 4.7M/s 16KiB 2.46M/s 3.57M/s 5.92M/s 6.44M/s 6.43M/s 6.38M/s 6.4M/s 6.43M/s 6.43M/s 6.84M/s 6.83M/s 6.86M/s 4.89M/s 3.35M/s 3.28M/s 4.76M/s ## No special fat area really stands out

13 years

Samsung MB-MS4GB 4 GB microSDHC

by Andrew Bradford

andrew@brick:~/git/flashbench$ head /sys/block/mmcblk0/device/* 2>/dev/null | grep -v ^$ ==> /sys/block/mmcblk0/device/block <== ==> /sys/block/mmcblk0/device/cid <== 1b534d30303030301091ce109c00d500 ==> /sys/block/mmcblk0/device/csd <== 400e00325b5900001d4d7f800a400000 ==> /sys/block/mmcblk0/device/date <== 05/2013 ==> /sys/block/mmcblk0/device/driver <== ==> /sys/block/mmcblk0/device/erase_size <== 512 ==> /sys/block/mmcblk0/device/fwrev <== 0x0 ==> /sys/block/mmcblk0/device/hwrev <== 0x1 ==> /sys/block/mmcblk0/device/manfid <== 0x00001b ==> /sys/block/mmcblk0/device/name <== 00000 ==> /sys/block/mmcblk0/device/oemid <== 0x534d ==> /sys/block/mmcblk0/device/power <== ==> /sys/block/mmcblk0/device/preferred_erase_size <== 4194304 ==> /sys/block/mmcblk0/device/scr <== 0235000000000000 ==> /sys/block/mmcblk0/device/serial <== 0x91ce109c ==> /sys/block/mmcblk0/device/subsystem <== ==> /sys/block/mmcblk0/device/type <== SD ==> /sys/block/mmcblk0/device/uevent <== DRIVER=mmcblk MMC_TYPE=SD MMC_NAME=00000 MODALIAS=mmc:block andrew@brick:~/git/flashbench$ sudo fdisk -l /dev/mmcblk0 Disk /dev/mmcblk0: 3933 MB, 3933208576 bytes, 7682048 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/mmcblk0p1 8192 7682047 3836928 b W95 FAT32 andrew@brick:~/git/flashbench$ factor 3933208576 3933208576: 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 11 11 31 andrew@brick:~/git/flashbench$ sudo ./flashbench -a /dev/mmcblk0 --blocksize=1024 --count=100 align 1073741824 pre 336µs on 423µs post 408µs diff 50.8µs align 536870912 pre 341µs on 424µs post 417µs diff 45.4µs align 268435456 pre 330µs on 410µs post 405µs diff 42.8µs align 134217728 pre 324µs on 399µs post 407µs diff 33.5µs align 67108864 pre 325µs on 399µs post 408µs diff 32.6µs align 33554432 pre 325µs on 399µs post 407µs diff 32.8µs align 16777216 pre 325µs on 399µs post 408µs diff 32.4µs align 8388608 pre 331µs on 416µs post 415µs diff 42.7µs align 4194304 pre 340µs on 424µs post 425µs diff 41.6µs align 2097152 pre 341µs on 430µs post 422µs diff 48.9µs align 1048576 pre 337µs on 430µs post 427µs diff 48µs align 524288 pre 340µs on 402µs post 423µs diff 21µs align 262144 pre 335µs on 402µs post 426µs diff 21.2µs align 131072 pre 339µs on 402µs post 421µs diff 21.4µs align 65536 pre 336µs on 402µs post 426µs diff 20.8µs align 32768 pre 339µs on 401µs post 423µs diff 20.2µs align 16384 pre 336µs on 401µs post 424µs diff 20.6µs align 8192 pre 336µs on 394µs post 418µs diff 17.5µs align 4096 pre 381µs on 377µs post 370µs diff 877ns align 2048 pre 405µs on 400µs post 394µs diff 1.01µs ## 1 MiB erase blocks andrew@brick:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --erasesize=$[1024*1024] --blocksize=$[8*1024] --open-au-nr=1 1MiB 3.07M/s 512KiB 4.7M/s 256KiB 8.76M/s 128KiB 8.59M/s 64KiB 5.31M/s 32KiB 3.01M/s 16KiB 6.89M/s 8KiB 4.46M/s andrew@brick:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --erasesize=$[1024*1024] --blocksize=$[8*1024] --open-au-nr=2 1MiB 8.93M/s 512KiB 8.88M/s 256KiB 8.91M/s 128KiB 8.91M/s 64KiB 8.8M/s 32KiB 8.53M/s 16KiB 6.77M/s 8KiB 4.43M/s andrew@brick:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --erasesize=$[1024*1024] --blocksize=$[8*1024] --open-au-nr=3 1MiB 3.02M/s 512KiB 1.87M/s 256KiB 1.19M/s 128KiB 630K/s 64KiB 406K/s 32KiB 408K/s 16KiB 398K/s 8KiB 2.09M/s andrew@brick:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --erasesize=$[1024*1024] --blocksize=$[8*1024] --random --open-au-nr=1 1MiB 9.01M/s 512KiB 8.97M/s 256KiB 1.72M/s 128KiB 8.94M/s 64KiB 8.91M/s 32KiB 8.72M/s 16KiB 7.04M/s 8KiB 4.59M/s andrew@brick:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --erasesize=$[1024*1024] --blocksize=$[8*1024] --random --open-au-nr=2 1MiB 8.2M/s 512KiB 8.95M/s 256KiB 8.89M/s 128KiB 8.86M/s 64KiB 8.67M/s 32KiB 8.35M/s 16KiB 6.64M/s 8KiB 4.22M/s andrew@brick:~/git/flashbench$ sudo ./flashbench /dev/mmcblk0 --open-au --erasesize=$[1024*1024] --blocksize=$[8*1024] --random --open-au-nr=3 1MiB 1.81M/s 512KiB 1.45M/s 256KiB 1.02M/s 128KiB 689K/s 64KiB 439K/s 32KiB 390K/s 16KiB 397K/s 8KiB 2.46M/s ## 2 open-au linear and random andrew@brick:~/git/flashbench$ sudo ./flashbench --find-fat --erasesize=$[1024*1024] --fat-nr=16 /dev/mmcblk0 1MiB 1.75M/s 8.97M/s 8.8M/s 1.7M/s 5.05M/s 5.5M/s 6.44M/s 6.57M/s 6.43M/s 6.4M/s 6.67M/s 6.36M/s 6.5M/s 6.67M/s 6.33M/s 6.45M/s 512KiB 6.47M/s 6.36M/s 8.92M/s 4.34M/s 2.97M/s 4.66M/s 5.03M/s 6.03M/s 6.57M/s 6.65M/s 6.26M/s 6.65M/s 6.57M/s 6.32M/s 6.68M/s 6.49M/s 256KiB 6.21M/s 6.62M/s 6.61M/s 4.3M/s 2.97M/s 4.57M/s 4.98M/s 5.99M/s 6.65M/s 6.65M/s 6.28M/s 6.53M/s 6.66M/s 6.19M/s 6.53M/s 6.63M/s 128KiB 6.07M/s 6.52M/s 6.62M/s 4.35M/s 2.95M/s 4.4M/s 5.01M/s 5.9M/s 6.6M/s 6.51M/s 6.14M/s 6.6M/s 6.67M/s 6.24M/s 6.67M/s 6.68M/s 64KiB 6.14M/s 6.6M/s 6.61M/s 4.42M/s 2.96M/s 4.35M/s 4.98M/s 5.88M/s 6.49M/s 6.58M/s 6.13M/s 6.53M/s 6.47M/s 6.18M/s 6.56M/s 6.48M/s 32KiB 4.8M/s 4.98M/s 4.99M/s 7.08M/s 8.27M/s 7.97M/s 7.63M/s 8.17M/s 8.23M/s 8.34M/s 8.41M/s 8.11M/s 4.08M/s 2.91M/s 4.57M/s 4.86M/s 16KiB 2.65M/s 3.71M/s 6.54M/s 6.54M/s 6.51M/s 6.6M/s 6.68M/s 6.52M/s 6.53M/s 6.79M/s 6.83M/s 7M/s 5.19M/s 3.45M/s 3.38M/s 5.21M/s

13 years

flashbench-results金牌店长特训营05:56:43

by 王丽

13 years

flashbench-results精英训练营05:11:07

by 田亮

13 years

Sandisk Cruzer 32G

by Jean-René Reinhard

Tests for Sandisk 32G usb flash drive. $ lsusb Bus 002 Device 003: ID 0781:5530 SanDisk Corp. Cruzer $ fdisk -l /dev/sdc Disk /dev/sdc: 32.0 GB, 32015679488 bytes 255 têtes, 63 secteurs/piste, 3892 cylindres, total 62530624 secteurs Unités = secteurs de 1 * 512 = 512 octets Taille de secteur (logique / physique) : 512 octets / 512 octets taille d'E/S (minimale / optimale) : 512 octets / 512 octets Identifiant de disque : 0x00000000 Périphérique Amorce Début Fin Blocs Id Système /dev/sdc1 * 32 62530623 31265296 c W95 FAT32 (LBA) $ ./flashbench -a /dev/sdc --blocksize=1024 align 8589934592 pre 931µs on 1.44ms post 811µs diff 565µs align 4294967296 pre 894µs on 1.58ms post 770µs diff 750µs align 2147483648 pre 878µs on 1.59ms post 791µs diff 756µs align 1073741824 pre 946µs on 1.75ms post 896µs diff 825µs align 536870912 pre 942µs on 1.69ms post 909µs diff 766µs align 268435456 pre 901µs on 1.58ms post 851µs diff 708µs align 134217728 pre 937µs on 1.65ms post 882µs diff 741µs align 67108864 pre 902µs on 1.63ms post 842µs diff 760µs align 33554432 pre 898µs on 1.62ms post 842µs diff 751µs align 16777216 pre 878µs on 1.63ms post 911µs diff 737µs align 8388608 pre 884µs on 1.62ms post 890µs diff 734µs align 4194304 pre 858µs on 1.42ms post 786µs diff 597µs align 2097152 pre 869µs on 923µs post 882µs diff 47.6µs align 1048576 pre 879µs on 917µs post 866µs diff 45µs align 524288 pre 844µs on 881µs post 844µs diff 37µs align 262144 pre 842µs on 890µs post 846µs diff 45.9µs align 131072 pre 839µs on 884µs post 846µs diff 41.6µs align 65536 pre 846µs on 880µs post 829µs diff 42.6µs align 32768 pre 841µs on 897µs post 841µs diff 55.7µs align 16384 pre 842µs on 878µs post 884µs diff 14.7µs align 8192 pre 843µs on 854µs post 844µs diff 10µs align 4096 pre 846µs on 848µs post 845µs diff 2.42µs align 2048 pre 845µs on 846µs post 846µs diff 658ns $ ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[256* 1024] /dev/sdc --open-au-nr=7 4MiB 23M/s 2MiB 22.8M/s 1MiB 22.8M/s 512KiB 22.5M/s 256KiB 21.5M/s $ ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[256* 1024] /dev/sdc --open-au-nr=8 4MiB 15.2M/s 2MiB 22.8M/s 1MiB 22.7M/s 512KiB 22.4M/s 256KiB 21.5M/s $ ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[256* 1024] /dev/sdc --open-au-nr=9 4MiB 23M/s 2MiB 22.8M/s 1MiB 22.7M/s 512KiB 22.5M/s 256KiB 21.4M/s $ ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[256* 1024] /dev/sdc --open-au-nr=10 4MiB 10.4M/s 2MiB 6.93M/s 1MiB 5.95M/s 512KiB 6.06M/s 256KiB 5.81M/s $ ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[256* 1024] /dev/sdc --random --open-au-nr=9 4MiB 23M/s 2MiB 22.8M/s 1MiB 22.7M/s 512KiB 21.3M/s 256KiB 10.5M/s $ ./flashbench -O --erasesize=$[4 * 1024 * 1024] --blocksize=$[256* 1024] /dev/sdc --random --open-au-nr=10 4MiB 9.56M/s 2MiB 6.94M/s 1MiB 3.92M/s 512KiB 3.82M/s 256KiB 2.23M/s $ ./flashbench -f /dev/sdc --erasesize=$[4* 1024 * 1024] --blocksize=512 --random 4MiB 22.9M/s 23.1M/s 22.9M/s 23.1M/s 23.2M/s 23.2M/s 2MiB 23.2M/s 23.1M/s 23.1M/s 23.1M/s 23.1M/s 23M/s 1MiB 23M/s 23M/s 23M/s 23M/s 23M/s 22.9M/s 512KiB 21.5M/s 21.5M/s 21.6M/s 21.6M/s 21.5M/s 21.4M/s 256KiB 10.6M/s 10.7M/s 10.6M/s 10.6M/s 10.6M/s 10.6M/s 128KiB 2.89M/s 2.9M/s 2.85M/s 2.89M/s 2.9M/s 2.89M/s 64KiB 1.2M/s 1.21M/s 1.2M/s 1.2M/s 1.2M/s 1.2M/s 32KiB 601K/s 604K/s 603K/s 601K/s 604K/s 601K/s 16KiB 305K/s 306K/s 305K/s 304K/s 305K/s 304K/s 8KiB 1.62M/s 1.65M/s 1.64M/s 1.65M/s 1.64M/s 1.65M/s 4KiB 1.45M/s 1.46M/s 1.46M/s 1.45M/s 1.44M/s 1.43M/s 2KiB 729K/s 729K/s 722K/s 733K/s 732K/s 726K/s 1KiB 366K/s 365K/s 366K/s 364K/s 365K/s 362K/s 512B 172K/s 172K/s 171K/s 172K/s 171K/s 169K/s # For completeness sake $ ./flashbench -f /dev/sdc --erasesize=$[1024 * 1024] --blocksize=512 --random 1MiB 21M/s 22M/s 21.8M/s 23.2M/s 22M/s 21.9M/s 512KiB 20.7M/s 20.2M/s 15.2M/s 21.3M/s 21.2M/s 19.8M/s 256KiB 6.49M/s 7.91M/s 10.2M/s 6.66M/s 6.51M/s 18M/s 128KiB 3.36M/s 2.46M/s 4.96M/s 3.59M/s 3.37M/s 3.37M/s 64KiB 1.06M/s 1.45M/s 971K/s 1.15M/s 1.05M/s 1.39M/s 32KiB 633K/s 732K/s 566K/s 671K/s 633K/s 668K/s 16KiB 343K/s 327K/s 346K/s 339K/s 345K/s 341K/s 8KiB 1.05M/s 1.25M/s 1.18M/s 1.21M/s 985K/s 1.47M/s 4KiB 1.51M/s 1.56M/s 1.25M/s 1.55M/s 1.47M/s 1.35M/s 2KiB 816K/s 788K/s 793K/s 720K/s 809K/s 809K/s 1KiB 360K/s 390K/s 391K/s 363K/s 358K/s 388K/s 512B 172K/s 180K/s 172K/s 179K/s 172K/s 180K/s So my guess is erase block size = 4Mo, the page size seems to be 4K. Am I missing something? Are further test needed to characterize the USB stick? I plan to put an ext4 and a VFAT partition on this usb stick. Do I need to take steps further than ensuring an alignment of 4M boundaries to ensure proper use (e.g., adapt pagesize or cluster size of the filesystems)? Also, I wonder why -f tests show such poor performance for 32Kib and 16Kib and 8Kib compared to 4Kib. Best wishes, Jean-René Reinhard

13 years