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SD Card reading speed fix

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By -Arturo-, Senior Member on 30th March 2011, 08:00 AM
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31st March 2011, 09:36 AM |#11  
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ok, OC 480, data on sd partition. micro sdhc 4gb CLASS 2. Custom rom based on Gingerbones.

2048:
Write- 5.7
Read- 23.4

128(default):
Write- 5.7
Read- 12.1

4096: (OC 550)
Write- 6.1
Read- 11.5
 
 
31st March 2011, 10:04 AM |#12  
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hmm i tested this by just manual editing the value which resets after reboot.

4gb class2 card with no OC. sys on nand, data in partition using not so super froyo.

128:
write: 4.8 read 11.4

2048:
write 5.2 read 24.2

not sure if this improvement in read speed actually speeds up my kaiser. do you think a class 6 card would speed it up much?

not sure exactly how to implement it permanently, i tried manually adding a file but it didn't seem to work. though altering this value isn't too bad as i don't reboot often.
31st March 2011, 10:22 AM |#13  
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There's no caching on write aparently (probably to avoid lost data).
So writes must be mostly dependent on class + SD reader/writer driver.

Acording to wikipedia:
Class 2, 2 MB/s, slowest for SDHC cards.
Class 4, 4 MB/s.
Class 6, 6 MB/s.
Class 10, 10 MB/s.

(this is write speed, MegaBYTE).
So... either we are getting bogus results, or our cards are a little above the quoted class.
31st March 2011, 10:36 AM |#14  
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Quote:
Originally Posted by daedric

There's no caching on write aparently (probably to avoid lost data).
So writes must be mostly dependent on class + SD reader/writer driver.

Acording to wikipedia:
Class 2, 2 MB/s, slowest for SDHC cards.
Class 4, 4 MB/s.
Class 6, 6 MB/s.
Class 10, 10 MB/s.

(this is write speed, MegaBYTE).
So... either we are getting bogus results, or our cards are a little above the quoted class.

i think the classes are minimum speeds, and it seems other users are getting higher speeds than their class. how did you implement this script btw?
31st March 2011, 10:39 AM |#15  
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Read 1st post. Follow Link. Read whole 1st post there. There's a sample script there.
You must create a file in /system/etc/init.d/ named 99something_you_chose (should begin with 99, the files are executed in order, we should have our script run last).
So... either you remount /system with read+write permissions, and put the file there, or edit the androidinstall.tar and put the file there, or a androidupdate.tar with the file there.

Or...

https://market.android.com/details?i...k.sdspeedboost
Last edited by daedric; 31st March 2011 at 02:29 PM.
1st April 2011, 02:25 PM |#16  
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Quote:
Originally Posted by daedric

Read 1st post. Follow Link. Read whole 1st post there. There's a sample script there.
You must create a file in /system/etc/init.d/ named 99something_you_chose (should begin with 99, the files are executed in order, we should have our script run last).
So... either you remount /system with read+write permissions, and put the file there, or edit the androidinstall.tar and put the file there, or a androidupdate.tar with the file there.

Or...

https://market.android.com/details?i...k.sdspeedboost

@Daiedric

Did you notice any speed improvements in data read?
1st April 2011, 03:48 PM |#17  
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Wow, class 2 4GB sdhc /system on ext4 /data on ext4, Krazy 2.6.32.9, cynMod7,
Rogue Tools OC 529

Before
write 1.8
read 9.1

After mod to 2048 with Root explorer
write 2.9
read 20.1
1st April 2011, 04:48 PM |#18  
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hmm, drfno1, so do you have system and data on your SD card? is your kaiser quite slow then with write speeds of 2MBbps :S

i can't decide whether to buy a higher class SD card and if that will improve my kaiser's speed.
1st April 2011, 05:28 PM |#19  
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Been playing with this config only a few days with wifi only. My understanding is that the ext4 file system speed is what makes the system very usable. The only thing I find frustrating is the time it takes to boot and become stable. I say try it on your current sd first. The boost in reading seems to help starting apps and using file managers.
1st April 2011, 05:43 PM |#20  
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Quote:
Originally Posted by drfno1

Been playing with this config only a few days with wifi only. My understanding is that the ext4 file system speed is what makes the system very usable. The only thing I find frustrating is the time it takes to boot and become stable. I say try it on your current sd first. The boost in reading seems to help starting apps and using file managers.

I don't like this sd tools app at all. It gives me some ridiculous readings. I have a 6 gig class 4 card with 5 GB fat32 partition, the app shows that the size of the partition is 4,2 gb. Also I get speeds of around 1.9 writing and 4.5 reading...this can't be right. I have just tried another app and the results were as follows writing speed 5.1 and reading speed 10, this seems more like it. Unfortunately after applying the script I don't see any changes in results still around 5ws /10 rs.
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