Thread: [SOLVED] Different Data Transfer Speeds Reported on MicroSD Class 6 8GB
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epitaph is offline epitaph
2011-06-01 , 15:53
Banned | Posts: 358 | Thanked: 160 times | Joined on Dec 2010
#10
Originally Posted by topet2k12001 View Post
I think there needs to be at least one file that the program has created so it's okay to delete the other created files. Not sure if there is an option to change that. Here's what the author said, from his website:



So I guess it's required to have at least one file that was created by "f3write".
Hi, I'm not sure what your are talking about but I just follow your suggestion. I didn't have time to read the website. Isn't there not a simple program to benchmark? I want to test time dd if=/dev/null of=/dev/mmcblk0p1 count=512 bs=512 because I remember it is a good benchmark, too. PLEASE don't try this yourself. It's not tested!. What do you think is the difference? Me just to lazy to write my own shell-script?

EDIT:Here is a good tutorial how to use dd non-destructive and dma: http://wiki.linuxquestions.org/wiki/..._of_your_disks

EDIT: dd iflag=direct if=/dev/mmcblk0p1 of=/dev/null bs=512 count=100000
100000+0 Datensätze ein
100000+0 Datensätze aus
51200000 Bytes (51 MB) kopiert, 41,2531 s, 1,2 MB/s

dd if=/dev/mmcblk0p1 of=/dev/null bs=512 count=100000
100000+0 Datensätze ein
100000+0 Datensätze aus
51200000 Bytes (51 MB) kopiert, 3,17645 s, 16,1 MB/s

dd if=/dev/mmcblk0p1 of=/dev/null bs=512 count=900000
900000+0 Datensätze ein
900000+0 Datensätze aus
460800000 Bytes (461 MB) kopiert, 24,7127 s, 18,6 MB/s

dd if=/dev/mmcblk1p1 of=/dev/null bs=512 count=900000
900000+0 Datensätze ein
900000+0 Datensätze aus
460800000 Bytes (461 MB) kopiert, 34,2288 s, 13,5 MB/s

Blocksize

dd if=/dev/mmcblk0p1 of=/dev/null count=1
1+0 Datensätze ein
1+0 Datensätze aus
512 Bytes (512 B) kopiert, 0,0335083 s, 15,3 kB/s

dd if=/dev/mmcblk1p1 of=/dev/null count=1
1+0 Datensätze ein
1+0 Datensätze aus
512 Bytes (512 B) kopiert, 0,00357056 s, 143 kB/s

Unfortunatley dd works only when you have bash 4.2 installed!

Here another benchmark without my tune-up tools:

/dev/mmcblk0p1
900000+0 Datensätze ein
900000+0 Datensätze aus
460800000 Bytes (461 MB) kopiert, 25,3318 s, 18,2 MB/s

/dev/mmcblk1p1
900000+0 Datensätze ein
900000+0 Datensätze aus
460800000 Bytes (461 MB) kopiert, 28,351 s, 16,3 MB/s

here with my tune-up tools:

900000+0 Datensätze ein
900000+0 Datensätze aus
460800000 Bytes (461 MB) kopiert, 21,748 s, 21,2 MB/s
900000+0 Datensätze ein
900000+0 Datensätze aus
460800000 Bytes (461 MB) kopiert, 27,0826 s, 17,0 MB/s
Last edited by epitaph; 2011-06-01 at 18:17.