maemo.org - Talk - View Single Post - How fast is your SD card?

V10lator	2015-07-04 , 12:28
Posts: 37 \| Thanked: 68 times \| Joined on Jun 2015 @ Munich, Germany	#1

So far it seems as all answers to the question "how good/fast is the SD slot?" are guesses. Some think the phone supports UHS, other don't and so on.

So I thought it's time to benchmark. Now I could provide a rpm but that's overkilled as all you need is the hdparm binary. Either download the sources from http://sourceforge.net/projects/hdparm/ and compile it for yourself (which is as simple as executing make) or use this precompiled one.

To benchmark with it do:

Code:

/path/to/your/hdparm -t --direct /dev/mmcblk1

Here's the first result:

Code:

# /home/nemo/horst-NFS/hdparm-9.48/hdparm -t --direct /dev/mmcblk1

/dev/mmcblk1:
 Timing O_DIRECT disk reads:  62 MB in  3.04 seconds =  20.40 MB/sec

The card in use is TS16GUSDU1.

Another benchmark could be to read from the card after dropping caches but first we would need a file to read... Ideas?

//EDIT: Just for reference here the speed of the internal storage:

Code:

# /home/nemo/horst-NFS/hdparm-9.48/hdparm -t --direct /dev/mmcblk0

/dev/mmcblk0:
 Timing O_DIRECT disk reads: 210 MB in  3.02 seconds =  69.57 MB/sec…

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