Hi David,
On 6/19/19 3:38 AM, David Christensen wrote:
The best way to answer your question regarding performance of a size N
SD card vs. a size 2*N SD card is to buy two cards and benchmark them
using your workload. Please publish your findings.
Please find my four (4) findings below or at
http://paste.debian.net/1088723
The only benchmark I know how to use is flashbench. But unfortunately I
don't know how to interpret the resulting data.
I would be immensely grateful for advise on which of the 4 cards to use.
The testing was simple. I have downloaded and put the same copy of the
redpill RC3 image from http://box.redpill.dk/nonfree/ onto each SD card,
then I have followed the instructions. Each card now has an "Extended
system" created by the command box-add-gui on the same machine.
Then I have installed aptitude, run update and upgrade and autoclean,
and then installed and run flashbench with parameters: flashbench -a
/dev/mmcblk0 --blocksize=1024
The four cards are:
MicroSD SanDisk Extreme PRO 64GB [3] XC II
MicroSD SanDisk Extreme PLUS 64GB [3] XC I V30 A2
MicroSD SanDisk Extreme PLUS 32GB [3] HC I V30 A1
MicroSD SanDisk Ultra 32GB [1] HC I (10) A1
I can send a picture of the cards off list if this is unclear.
So the question is, which card should I use for Teres-I ?
If there are further benchmarks or tests that could help determine which
SD card is the best, I'd be happy to run them.
Best regards.
//Erik
MicroSD SanDisk Extreme PRO 64GB [3] XC II
debian@box:~$ sudo flashbench -a /dev/mmcblk0 --blocksize=1024
align 17179869184 pre 515µs on 809µs post 452µs diff
325µs
align 8589934592 pre 515µs on 736µs post 427µs diff
265µs
align 4294967296 pre 537µs on 823µs post 460µs diff
325µs
align 2147483648 pre 545µs on 893µs post 471µs diff
385µs
align 1073741824 pre 517µs on 749µs post 434µs diff
274µs
align 536870912 pre 526µs on 763µs post 445µs diff 277µs
align 268435456 pre 527µs on 769µs post 448µs diff 282µs
align 134217728 pre 540µs on 820µs post 446µs diff 327µs
align 67108864 pre 514µs on 754µs post 449µs diff 273µs
align 33554432 pre 506µs on 722µs post 417µs diff 261µs
align 16777216 pre 539µs on 660µs post 460µs diff 160µs
align 8388608 pre 539µs on 670µs post 458µs diff 171µs
align 4194304 pre 541µs on 669µs post 466µs diff 165µs
align 2097152 pre 547µs on 649µs post 463µs diff 144µs
align 1048576 pre 544µs on 639µs post 458µs diff 138µs
align 524288 pre 545µs on 658µs post 460µs diff 155µs
align 262144 pre 545µs on 655µs post 460µs diff 152µs
align 131072 pre 540µs on 620µs post 455µs diff 122µs
align 65536 pre 541µs on 624µs post 458µs diff 125µs
align 32768 pre 538µs on 622µs post 461µs diff 122µs
align 16384 pre 478µs on 633µs post 457µs diff 165µs
align 8192 pre 501µs on 516µs post 480µs diff 25.7µs
align 4096 pre 509µs on 528µs post 465µs diff 41.2µs
align 2048 pre 514µs on 538µs post 508µs diff 27.6µs
MicroSD SanDisk Extreme PLUS 64GB [3] XC I V30 A2
debian@box:~$ sudo flashbench -a /dev/mmcblk0 --blocksize=1024
align 17179869184 pre 567µs on 603µs post 494µs diff
72.6µs
align 8589934592 pre 557µs on 583µs post 442µs diff
83.9µs
align 4294967296 pre 689µs on 784µs post 564µs diff
157µs
align 2147483648 pre 654µs on 726µs post 593µs diff
103µs
align 1073741824 pre 579µs on 638µs post 522µs diff
87.7µs
align 536870912 pre 570µs on 652µs post 529µs diff 102µs
align 268435456 pre 524µs on 564µs post 500µs diff 52.5µs
align 134217728 pre 654µs on 730µs post 616µs diff 95.3µs
align 67108864 pre 664µs on 728µs post 600µs diff 96.3µs
align 33554432 pre 576µs on 637µs post 530µs diff 84.1µs
align 16777216 pre 628µs on 694µs post 568µs diff 95.9µs
align 8388608 pre 594µs on 654µs post 567µs diff 73.6µs
align 4194304 pre 628µs on 680µs post 580µs diff 76µs
align 2097152 pre 576µs on 602µs post 562µs diff 33.5µs
align 1048576 pre 578µs on 577µs post 572µs diff 2.21µs
align 524288 pre 585µs on 585µs post 578µs diff 3.55µs
align 262144 pre 587µs on 592µs post 584µs diff 6.52µs
align 131072 pre 616µs on 636µs post 613µs diff 21.4µs
align 65536 pre 594µs on 586µs post 596µs diff -8963ns
align 32768 pre 636µs on 695µs post 587µs diff 83.6µs
align 16384 pre 548µs on 551µs post 550µs diff 2.51µs
align 8192 pre 551µs on 555µs post 546µs diff 6.74µs
align 4096 pre 579µs on 604µs post 547µs diff 40.7µs
align 2048 pre 586µs on 579µs post 586µs diff -6480ns
MicroSD SanDisk Extreme PLUS 32GB [3] HC I V30 A1
debian@box:~$ sudo flashbench -a /dev/mmcblk0 --blocksize=1024
align 8589934592 pre 329µs on 367µs post 302µs diff
51.3µs
align 4294967296 pre 360µs on 407µs post 304µs diff
74.6µs
align 2147483648 pre 344µs on 370µs post 322µs diff
36.8µs
align 1073741824 pre 408µs on 455µs post 409µs diff
46.5µs
align 536870912 pre 436µs on 486µs post 411µs diff 62.6µs
align 268435456 pre 428µs on 449µs post 402µs diff 34.2µs
align 134217728 pre 417µs on 452µs post 392µs diff 47.7µs
align 67108864 pre 433µs on 481µs post 414µs diff 57.6µs
align 33554432 pre 307µs on 345µs post 318µs diff 32µs
align 16777216 pre 359µs on 381µs post 303µs diff 50.5µs
align 8388608 pre 360µs on 398µs post 316µs diff 59.8µs
align 4194304 pre 352µs on 391µs post 300µs diff 64.8µs
align 2097152 pre 316µs on 315µs post 317µs diff -1358ns
align 1048576 pre 322µs on 323µs post 320µs diff 1.96µs
align 524288 pre 325µs on 334µs post 325µs diff 9.38µs
align 262144 pre 326µs on 327µs post 326µs diff 443ns
align 131072 pre 328µs on 343µs post 325µs diff 16.1µs
align 65536 pre 307µs on 306µs post 306µs diff -688ns
align 32768 pre 315µs on 314µs post 316µs diff -1308ns
align 16384 pre 328µs on 331µs post 326µs diff 3.87µs
align 8192 pre 306µs on 304µs post 308µs diff -2568ns
align 4096 pre 303µs on 324µs post 307µs diff 19.5µs
align 2048 pre 309µs on 309µs post 311µs diff -1260ns
MicroSD SanDisk Ultra 32GB [1] HC I (10) A1
debian@box:~$ sudo flashbench -a /dev/mmcblk0 --blocksize=1024
align 8589934592 pre 351µs on 380µs post 317µs diff
46.3µs
align 4294967296 pre 368µs on 399µs post 316µs diff
57.4µs
align 2147483648 pre 358µs on 383µs post 347µs diff
30µs
align 1073741824 pre 409µs on 454µs post 403µs diff
47.9µs
align 536870912 pre 360µs on 395µs post 360µs diff 35.2µs
align 268435456 pre 408µs on 447µs post 378µs diff 53.6µs
align 134217728 pre 366µs on 391µs post 358µs diff 28.5µs
align 67108864 pre 474µs on 512µs post 451µs diff 49.3µs
align 33554432 pre 344µs on 370µs post 338µs diff 28.6µs
align 16777216 pre 383µs on 410µs post 342µs diff 47.3µs
align 8388608 pre 378µs on 407µs post 339µs diff 48.5µs
align 4194304 pre 380µs on 401µs post 349µs diff 36.8µs
align 2097152 pre 367µs on 368µs post 356µs diff 6.37µs
align 1048576 pre 375µs on 374µs post 362µs diff 5.4µs
align 524288 pre 380µs on 393µs post 365µs diff 20.6µs
align 262144 pre 379µs on 380µs post 369µs diff 6.17µs
align 131072 pre 382µs on 382µs post 371µs diff 5.39µs
align 65536 pre 382µs on 380µs post 371µs diff 3.25µs
align 32768 pre 384µs on 383µs post 369µs diff 6.38µs
align 16384 pre 375µs on 374µs post 373µs diff 387ns
align 8192 pre 372µs on 374µs post 374µs diff 456ns
align 4096 pre 379µs on 391µs post 375µs diff 14.3µs
align 2048 pre 382µs on 383µs post 379µs diff 2.12µs
