Hi,
I'm really sorry for the really-really long time I haven't answered.
Here are some other results, these were run 1 month ago. Quite unreadable for me. I will write an awk script and redo the tests, and put the results on https://gist.github.com/. Or somewhere else you would like to.
And thank you for your previous comment.
flashbench -a /dev/disk/by-id/usb-ADATA_USB_Flash_Drive_1061309422330015-0:0 --blocksize=3072 --count=100 align 1610612736 pre 791µs on 810µs post 804µs diff 12.8µs align 805306368 pre 740µs on 742µs post 759µs diff -7482ns align 402653184 pre 755µs on 770µs post 756µs diff 14.2µs align 201326592 pre 654µs on 683µs post 651µs diff 30.4µs align 100663296 pre 669µs on 687µs post 669µs diff 18.2µs align 50331648 pre 668µs on 685µs post 667µs diff 17.3µs align 25165824 pre 653µs on 649µs post 649µs diff -1336ns align 12582912 pre 634µs on 649µs post 633µs diff 15.3µs align 6291456 pre 670µs on 685µs post 672µs diff 13.6µs align 3145728 pre 760µs on 757µs post 758µs diff -1894ns align 1572864 pre 746µs on 757µs post 741µs diff 13µs align 786432 pre 744µs on 783µs post 743µs diff 39.4µs align 393216 pre 760µs on 773µs post 757µs diff 15.1µs align 196608 pre 804µs on 820µs post 805µs diff 15.1µs align 98304 pre 705µs on 701µs post 704µs diff -4015ns align 49152 pre 802µs on 801µs post 800µs diff -262ns align 24576 pre 721µs on 748µs post 732µs diff 21.9µs align 12288 pre 931µs on 837µs post 699µs diff 21.5µs align 6144 pre 942µs on 727µs post 764µs diff -125934
--erasesize=$[6* 1024 * 1024] --blocksize=$[3*1024] --count=100
oau=2 6MiB 3.25M/s 3MiB 3.2M/s 1.5MiB 2.2M/s 768KiB 2.14M/s 384KiB 2.07M/s 192KiB 2.03M/s 96KiB 1.91M/s 48KiB 1.58M/s 24KiB 1.34M/s 12KiB 834K/s 6KiB 479K/s 3KiB 286K/s
oau=2 random 6MiB 2.86M/s 3MiB 1.78M/s 1.5MiB 1.98M/s 768KiB 1.35M/s 384KiB 470K/s 192KiB 286K/s 96KiB 181K/s 48KiB 2.78M/s 24KiB 653K/s 12KiB 88.9K/s 6KiB 57.9K/s 3KiB 157K/s
oau=3 6MiB 3.53M/s 3MiB 3.95M/s 1.5MiB 2.86M/s 768KiB 2.76M/s 384KiB 2.65M/s 192KiB 2.57M/s 96KiB 2.4M/s 48KiB 2M/s 24KiB 1.56M/s 12KiB 798K/s 6KiB 390K/s 3KiB 257K/s
oau=3 random 6MiB 2.56M/s 3MiB 1.79M/s 1.5MiB 1.67M/s 768KiB 1.17M/s 384KiB 441K/s 192KiB 262K/s 96KiB 162K/s 48KiB 2.76M/s 24KiB 213K/s 12KiB 77.2K/s 6KiB 37.8K/s 3KiB 98.2K/s
oau=4 6MiB 3.82M/s 3MiB 4M/s 1.5MiB 3.13M/s 768KiB 3.04M/s 384KiB 2.9M/s 192KiB 2.76M/s 96KiB 2.22M/s 48KiB 1.65M/s 24KiB 1.1M/s 12KiB 1.02M/s 6KiB 420K/s 3KiB 233K/s
oau=4 random 6MiB 2.55M/s 3MiB 1.61M/s 1.5MiB 1.31M/s 768KiB 611K/s 384KiB 331K/s 192KiB 164K/s 96KiB 110K/s 48KiB 819K/s 24KiB 126K/s 12KiB 55.6K/s 6KiB 27.9K/s 3KiB 65.3K/s
oau=5 6MiB 3.97M/s 3MiB 4.15M/s 1.5MiB 2.79M/s 768KiB 2.71M/s 384KiB 2.59M/s 192KiB 2.48M/s 96KiB 1.26M/s 48KiB 1.52M/s 24KiB 1.3M/s 12KiB 848K/s 6KiB 362K/s 3KiB 191K/s
oau=5 random 6MiB 2.63M/s 3MiB 1.57M/s 1.5MiB 1.36M/s 768KiB 642K/s 384KiB 349K/s 192KiB 174K/s 96KiB 115K/s 48KiB 259K/s 24KiB 91.9K/s 12KiB 43.6K/s 6KiB 25.2K/s 3KiB 7.5K/s
oau=6 6MiB 2.98M/s 3MiB 1.62M/s 1.5MiB 1.11M/s 768KiB 619K/s 384KiB 343K/s 192KiB 178K/s 96KiB 62.6K/s 48KiB 63.4K/s 24KiB 31.9K/s 12KiB 16K/s 6KiB 8.05K/s 3KiB 170K/s
oau=6 random 6MiB 2.99M/s 3MiB 1.68M/s 1.5MiB 1.4M/s 768KiB 757K/s 384KiB 412K/s 192KiB 213K/s 96KiB 149K/s 48KiB 137K/s 24KiB 71K/s 12KiB 21.1K/s 6KiB 6.42K/s 3KiB 6.84K/s
--erasesize=$[8* 1024 * 1024] --blocksize=$[4*1024] --count=100
oau=2 8MiB 4.57M/s 4MiB 4.56M/s 2MiB 2.98M/s 1MiB 2.98M/s 512KiB 2.83M/s 256KiB 2.73M/s 128KiB 2.58M/s 64KiB 2.18M/s 32KiB 1.9M/s 16KiB 1.22M/s 8KiB 594K/s 4KiB 342K/s
oau=2 random 8MiB 3.96M/s 4MiB 2.64M/s 2MiB 2.85M/s 1MiB 1.37M/s 512KiB 738K/s 256KiB 374K/s 128KiB 194K/s 64KiB 1.99M/s 32KiB 417K/s 16KiB 63.5K/s 8KiB 38.7K/s 4KiB 147K/s
oau=3 8MiB 4.45M/s 4MiB 4.51M/s 2MiB 3.3M/s 1MiB 3.3M/s 512KiB 3.18M/s 256KiB 3.04M/s 128KiB 2.7M/s 64KiB 1.53M/s 32KiB 2.28M/s 16KiB 1.13M/s 8KiB 567K/s 4KiB 292K/s
oau=3 random 8MiB 3.72M/s 4MiB 2.66M/s 2MiB 2.19M/s 1MiB 1.35M/s 512KiB 739K/s 256KiB 372K/s 128KiB 194K/s 64KiB 2.01M/s 32KiB 140K/s 16KiB 62.3K/s 8KiB 31.8K/s 4KiB 103K/s
oau=4 8MiB 4.19M/s 4MiB 4.47M/s 2MiB 3.54M/s 1MiB 3.51M/s 512KiB 3.42M/s 256KiB 1.58M/s 128KiB 2.92M/s 64KiB 1.77M/s 32KiB 1.39M/s 16KiB 1.24M/s 8KiB 525K/s 4KiB 256K/s
oau=4 random 8MiB 3.61M/s 4MiB 2.34M/s 2MiB 1.81M/s 1MiB 879K/s 512KiB 520K/s 256KiB 247K/s 128KiB 162K/s 64KiB 1.57M/s 32KiB 103K/s 16KiB 40.8K/s 8KiB 24.7K/s 4KiB 70.4K/s
oau=5 8MiB 4.44M/s 4MiB 4.45M/s 2MiB 3.68M/s 1MiB 3.2M/s 512KiB 1.76M/s 256KiB 2.91M/s 128KiB 2.73M/s 64KiB 1.73M/s 32KiB 1.32M/s 16KiB 1.14M/s 8KiB 472K/s 4KiB 216K/s
oau=5 random 8MiB 3.72M/s 4MiB 2.3M/s 2MiB 1.92M/s 1MiB 891K/s 512KiB 492K/s 256KiB 224K/s 128KiB 196K/s 64KiB 267K/s 32KiB 113K/s 16KiB 43.3K/s 8KiB 23.8K/s 4KiB 53.5K/s
--erasesize=$[12* 1024 * 1024] --blocksize=$[3*1024] --count=100
oau=2 12MiB 3.94M/s 6MiB 3.99M/s 3MiB 4M/s 1.5MiB 3.06M/s 768KiB 3.01M/s 384KiB 2.91M/s 192KiB 2.82M/s 96KiB 2.6M/s 48KiB 2.03M/s 24KiB 1.63M/s 12KiB 1.04M/s 6KiB 397K/s 3KiB 291K/s
oau=2 random 12MiB 3.72M/s 6MiB 3.19M/s 3MiB 2.09M/s 1.5MiB 2.71M/s 768KiB 1.75M/s 384KiB 841K/s 192KiB 542K/s 96KiB 522K/s 48KiB 441K/s 24KiB 139K/s 12KiB 60.6K/s 6KiB 27.6K/s 3KiB 60.5K/s
oau=3 12MiB 3.2M/s 6MiB 4.51M/s 3MiB 4.52M/s 1.5MiB 3.65M/s 768KiB 3.59M/s 384KiB 3.45M/s 192KiB 3.29M/s 96KiB 3.03M/s 48KiB 2.35M/s 24KiB 1.74M/s 12KiB 1.01M/s 6KiB 332K/s 3KiB 255K/s
oau=3 random 12MiB 3.65M/s 6MiB 3.16M/s 3MiB 2.06M/s 1.5MiB 2.71M/s 768KiB 1.93M/s 384KiB 911K/s 192KiB 551K/s 96KiB 272K/s 48KiB 339K/s 24KiB 68.2K/s 12KiB 25.7K/s 6KiB 18.9K/s 3KiB 14.2K/s
oau=4 12MiB 4.14M/s 6MiB 4.14M/s 3MiB 4.26M/s 1.5MiB 4.18M/s 768KiB 4.12M/s 384KiB 3.98M/s 192KiB 3.78M/s 96KiB 2.04M/s 48KiB 2.09M/s 24KiB 1.68M/s 12KiB 1.17M/s 6KiB 325K/s 3KiB 228K/s
oau=4 random 12MiB 3.71M/s 6MiB 3.19M/s 3MiB 1.99M/s 1.5MiB 1.52M/s 768KiB 934K/s 384KiB 778K/s 192KiB 312K/s 96KiB 156K/s 48KiB 83.4K/s 24KiB 55.3K/s 12KiB 32.6K/s 6KiB 16.4K/s 3KiB 11.5K/s
oau=5 12MiB 3.62M/s 6MiB 3.14M/s 3MiB 3.75M/s 1.5MiB 3.74M/s 768KiB 3.67M/s 384KiB 3.54M/s 192KiB 3.38M/s 96KiB 1.74M/s 48KiB 1.89M/s 24KiB 1.55M/s 12KiB 1.03M/s 6KiB 307K/s 3KiB 191K/s
oau=5 random 12MiB 3.82M/s 6MiB 3.05M/s 3MiB 2.07M/s 1.5MiB 1.55M/s 768KiB 981K/s 384KiB 558K/s 192KiB 206K/s 96KiB 160K/s 48KiB 77.4K/s 24KiB 44.7K/s 12KiB 17.9K/s 6KiB 10.3K/s ^C
--erasesize=$[4* 1024 * 1024] --blocksize=$[4*1024] --count=100
oau=2 4MiB 4.04M/s 2MiB 3.13M/s 1MiB 3.13M/s 512KiB 3M/s 256KiB 2.91M/s 128KiB 2.75M/s 64KiB 2.41M/s 32KiB 2.3M/s 16KiB 1.05M/s 8KiB 762K/s 4KiB 384K/s
oau=2 random 4MiB 2.6M/s 2MiB 2.5M/s 1MiB 2.32M/s 512KiB 989K/s 256KiB 562K/s 128KiB 260K/s 64KiB 2.04M/s 32KiB 2.26M/s 16KiB 209K/s 8KiB 81.5K/s 4KiB 245K/s
oau=3 4MiB 2.96M/s 2MiB 3.37M/s 1MiB 3.43M/s 512KiB 3.3M/s 256KiB 3.12M/s 128KiB 2.88M/s 64KiB 2.58M/s 32KiB 2.23M/s 16KiB 1.01M/s 8KiB 822K/s 4KiB 315K/s
oau=3 random 4MiB 3.02M/s 2MiB 2.94M/s 1MiB 2.74M/s 512KiB 1.32M/s 256KiB 782K/s 128KiB 375K/s 64KiB 2.23M/s 32KiB 2.25M/s 16KiB 110K/s 8KiB 52.9K/s 4KiB 204K/s
oau=4 4MiB 2.41M/s 2MiB 3.37M/s 1MiB 3.32M/s 512KiB 3.23M/s 256KiB 3.1M/s 128KiB 2.85M/s 64KiB 2.48M/s 32KiB 1.72M/s 16KiB 1.04M/s 8KiB 857K/s 4KiB 267K/s
oau=4 random 4MiB 3.28M/s 2MiB 3.2M/s 1MiB 3.01M/s 512KiB 1.59M/s 256KiB 975K/s 128KiB 479K/s 64KiB 2.36M/s 32KiB 474K/s 16KiB 154K/s 8KiB 47K/s 4KiB 203K/s
oau=5 4MiB 2.16M/s 2MiB 3.3M/s 1MiB 3.28M/s 512KiB 3.19M/s 256KiB 3.05M/s 128KiB 2.81M/s 64KiB 2.47M/s 32KiB 1.55M/s 16KiB 1.09M/s 8KiB 779K/s 4KiB 242K/s
oau=5 random 4MiB 3.31M/s 2MiB 3.39M/s 1MiB 3.22M/s 512KiB 1.81M/s 256KiB 1.15M/s 128KiB 579K/s 64KiB 1.41M/s 32KiB 365K/s 16KiB 112K/s 8KiB 44.6K/s 4KiB 154K/s
oau=6 4MiB 2.41M/s 2MiB 3.46M/s 1MiB 3.4M/s 512KiB 3.29M/s 256KiB 3.15M/s 128KiB 2.87M/s 64KiB 2.54M/s 32KiB 1.47M/s 16KiB 1.06M/s 8KiB 23.2K/s 4KiB 201K/s
oau=6 random 4MiB 3.56M/s 2MiB 3.49M/s 1MiB 3.36M/s 512KiB 2.01M/s 256KiB 1.3M/s 128KiB 253K/s 64KiB 1.5M/s 32KiB 205K/s 16KiB 80.7K/s 8KiB 39.4K/s 4KiB 131K/s
oau=7 4MiB 3.73M/s 2MiB 1.45M/s 1MiB 695K/s 512KiB 341K/s 256KiB 169K/s 128KiB 83.9K/s 64KiB 2.19M/s 32KiB 1.4M/s 16KiB 52.7K/s 8KiB 5.68K/s 4KiB 201K/s
oau=8 4MiB 3.6M/s 2MiB 1.44M/s 1MiB 695K/s 512KiB 341K/s 256KiB 169K/s 128KiB 83.8K/s 64KiB 1.87M/s 32KiB 1.27M/s 16KiB 13.3K/s 8KiB 5.63K/s 4KiB 190K/s
Csordás Csaba Ifj.
On Mon, Feb 11, 2013 at 3:48 PM, Arnd Bergmann arnd@arndb.de wrote:
On Tuesday 05 February 2013, Csordás Csaba Ifj. wrote:
Hi,
I'm having troubles at the first step: determining the erase block size. The strange results are below. The original FAT layout was not saved when the drive was purchased.
# lsusb Bus 004 Device 002: ID 125f:c82a A-DATA Technology Co., Ltd.
# fdisk -l /dev/disk/by-id/usb-ADATA_USB_Flash_Drive_1061309422330015-0:0
Disk /dev/disk/by-id/usb-ADATA_USB_Flash_Drive_1061309422330015-0:0: 7873 MB, 7873757184 bytes 180 heads, 14 sectors/track, 6102 cylinders, total 15378432 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 identifier: 0xf65985aa
Device Boot Start End Blocks Id System/dev/disk/by-id/usb-ADATA_USB_Flash_Drive_1061309422330015-0:0-part1 2048 15378431 7688192 83 Linux
The size is a multiple of three, so you might want to retry with
# for i in 1 2 4 8 16; do echo -e "\n\nbs=$[$i*1024]"; flashbench -a /dev/disk/by-id/usb-ADATA_USB_Flash_Drive_1061309422330015-0:0 --blocksize=$[$i*1024]; done
--blocksize=3072.
If that does not help, you can run the other tests after guessing an erase block size, because sometimes the -a test does not reveal anything at all.
My first guess for this device would be a 6 MB erase block size, followed by 8 MB, 12 MB, and 4 MB.
Arnd