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What is the cluster size of Jolla's EMMC?

asked 2014-11-21 02:29:25 +0300

Arthur Artoria gravatar image

What is the cluster size of Jolla's EMMC? 1024? 4096?

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answered 2015-01-29 01:02:10 +0300

axaq gravatar image

As far as I know eMMC are flashes with internal controller and firmware just like inside SD cards. And optimising for only one paramter (like clustersize) or so is not helpful here. You need to use a flash aware filesystem. The used btrfs is not bad for flash and also supports some more features like snapshots.

Please have a look also to my answer here.

And if you want to find out more about the eMMC parameters you need to use tools like flashbench.

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answered 2014-11-21 02:32:50 +0300

xernobyl gravatar image

Just search for the cheapest 32GB EMMC chip, and it should be it, are you really expecting an answer? They don't even say what processor they're using!

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Oh but they do, both for the phone and the tablet the processor is already told. I wouldn't wonder if one developer at Jolla would answer to this, just when they have time :)

simo ( 2014-11-21 02:47:04 +0300 )edit
1

No, I think this is a question related to system. In windows, we can re-format disk partition to NTFS in 1024, 2048 or 4096 cluster size. This information is useful when I want to optimize the speed of sqlite ( make the page size same as the cluster size )

Arthur Artoria ( 2014-11-21 02:48:49 +0300 )edit

Interesting! :) But I wonder how the btrfs block allocation can influence this optimization.

MartinK ( 2014-11-21 03:30:28 +0300 )edit

Here is the article: http://www.sqlite.org/cvstrac/wiki?p=PerformanceTuningWindows In the chaper: Three: Page Size can make a difference It mentioned about the relationship between page size of a sqlite database and the cluster size.

Arthur Artoria ( 2014-11-21 03:52:18 +0300 )edit
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answered 2014-11-21 13:01:20 +0300

Nieldk gravatar image

512B

http://talk.maemo.org/showpost.php?p=1404348&postcount=243

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@Nieldk: The 512B is only a logical mapping/layer. The internal properties (erase block size, page sizes, segment or allocation unit size) are completely different.

axaq ( 2015-01-29 01:07:28 +0300 )edit
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Asked: 2014-11-21 02:29:25 +0300

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Last updated: Jan 29 '15