microSD card performance comparison
#13
(03-26-2016, 03:18 AM)Tarjei85 Wrote: So what you are saying is that the proper formatting of the sdcard and as large as you can afford to go is the best sollution to get high random read wright speed?

Regarding the capacity of the card it depends on the card's controller. While it's known for some cards that their controller starts to do reads/writes in parallel when more flash chips are available cheap cards won't show this behaviour. Also there will be a maximum throughput so trying to double the speed by doubling capacity won't work infinite (see the aforementioned link to ODROIC-C2's eMMC behaviour to get the idea)

Here is some slightly outdated background information on the SD card market: http://www.bunniestudios.com/blog/?page_id=1022 (most obvious change back to then: you're able to buy SD/TF cards from Samsung now). Given these informations for me it makes absolutely no sense to buy anything else than either SanDisk (Extreme Pro or Extreme Plus) or Samsung (which label to choose depends on the use case). And if you care about longevity then the few bucks more for Extreme Plus or Pro+/EVO+ are a good invest.

Regarding proper settings there's a lot to do. Starts with identfying the internal behaviour of the SD card controller (page and erase block size) and then adjust partition and filesystem parameters to that. Then disabling ext4 journaling and switching to writeback helps a lot for specific use cases (but longsleep enabled the journal for a good reason: Since many Pine users simply have no clue what a filesystem is and that you should shutdown the Pine before powering off so that the filesystem is in a clean state after the next boot). And so you can tune other parameters as well (even exchanging the filesystem with for example btrfs with active transparent compression)

But the most important thing when it's about storage is: don't buy cheap crap. Buy recommended cards and test immediately whether you got fake/fraud storage media or not. And since Pine64's SD card implementation is unfortunately slower than necessary consider using USB connected fast storage also especially if you want to try 'Linux desktop' experiments.


Messages In This Thread
RE: microSD card performance comparison - by Andrew2 - 03-26-2016, 05:40 AM

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