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freitasm

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#157197 23-Nov-2014 00:18
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From AnandTech:


As you can see, there's a very significant performance penalty that comes with enabling FDE, with a 62.9% drop in random read performance, a 50.5% drop in random write performance, and a staggering 80.7% drop in sequential read performance. This has serious negative implications for device performance in any situation where applications are reading or writing to disk. Google's move to enable FDE by default also may not be very helpful with real world security without a change in user behaviour, as much of the security comes from the use of a passcode. This poses a problem, because the users that don't use a passcode doesn't really benefit from FDE, but they're still subject to the penalties.

When the Nexus 6 review was published, I commented that there were performance issues that weren't present on the Nexus 5 running Android Lollipop. Many users commented that the FDE may have been to blame. Like I mentioned earlier, Motorola provided us with a build of Android with FDE disabled.

 

I currently don't have an Android 5.0 device but my HTC One 4.4 has certainly taken a hit in performance after enabling full encryption.

What about experience wit





 

 

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timmmay
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  #1181501 23-Nov-2014 09:03
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Until there's dedicated acceleration hardware I'll be disabling encryption. I don't keep anything particularly private on my phone, and if I lose it I can easily change passwords to prevent people getting access to online services.

freitasm

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  #1181525 23-Nov-2014 10:48
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Problem is that to disable encryption from Android 4.x you have to reset it. And it's turned on by default on Android 5.0.






 

 

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timmmay
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  #1181527 23-Nov-2014 10:52
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I guess that means when you get a new phone you disable it immediately if you want it disabled, and you don't try to turn it off on 4.x unless you really want it off.

fallen
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  #1181528 23-Nov-2014 11:12
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I have a Nexus 5 and manually flashed the factory image when it was available. Encryption wasn't enabled by default. As I understand encryption is on by default for Nexus 6 and 9. For the other Nexus devices 4, 5 and 7, if you had encryption on prior then it will be on when upgrading to Android 5.

Batwing
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  #1181538 23-Nov-2014 11:20
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Encryption is not turned on by default on a fresh build of CM12.

ilovemusic
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  #1181546 23-Nov-2014 11:53
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fallen: I have a Nexus 5 and manually flashed the factory image when it was available. Encryption wasn't enabled by default. As I understand encryption is on by default for Nexus 6 and 9. For the other Nexus devices 4, 5 and 7, if you had encryption on prior then it will be on when upgrading to Android 5.


ditto.

my n5 got 5.0 ota.

encryption not on by default.

muppet
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  #1181573 23-Nov-2014 13:20
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For the Nexus6, Full Disk Encryption is not only "enabled" by default, it's not able to be disabled.

Unless you root the phone and use utils etc.  But out of the box to the average end-user, turning it off isn't an option.

This is the only thing that's making me a little umm and ahhh about getting an N6.

 
 
 
 


freitasm

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  #1186134 1-Dec-2014 09:52
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Just factory reset my HTC One M7 to remove the encryption... So much faster now.





 

 

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