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12th November 2012, 08:18 AM
(Last edited by lambgx02; Today at 05:27 PM.) | Senior Member - OPPosts: 151 Join Date: Jul 2008 Location: Montreal |
Hey everyone, So, I was experiencing significant lag as we all do from time to time, and decided I was going to get to the bottom of it. After tracing and debugging for hours, I discovered the source of 90% of Android's lag. In a word, entropy (or lack thereof). On some versions of Android, the JVM (and other components) read large amounts of random data from the blocking /dev/random device. Random data is used for all kinds of stuff.. UUID generation, session keys, SSL.. when we run out of entropy, the process blocks. That manifests itself as lag. The process cannot continue until the kernel generates more high quality random data. So, I cross-compiled rngd, and used it to feed /dev/urandom into /dev/random at 1 second intervals. Result? Significant lag reduction! ![]() Chrome, maps, and other heavy applications switch instantaneously, and map tiles populate as fast as I can scroll. You know how sometimes when you hit the home button, it takes 5-10 seconds for the home screen to repopulate? Yeah. Blocking on read of /dev/random. Problem solved. But don't take my word for it .. give it a shot! Update!
Version 1.1 attached. This version uses the release signature, so you will need to uninstall the old XDA version first! This version fixes the issue some users were seeing on later Jellybean ROMs, where the UI would misreport the RNG service status. Note that this APK is actually compatible with all Android versions, and all (armel) devices. It's not at all specific to the Captivate Glide. Caveats - There is a (theoretical) security risk, in that seeding /dev/random with /dev/urandom decreases the quality of the random data. In practice, the odds of this being cryptographically exploited are far lower than the odds of someone attacking the OS itself (a much simpler challenge).
- This may adversely affect battery life, since it wakes every second. It does not hold a wakelock, so it shouldn't have a big impact, but let me know if you think it's causing problems. I can add a blocking read to the code so that it only executes while the screen is on. On the other hand, many of us attribute lag to lacking CPU power. Since this hack eliminates almost all lag, there is less of a need to overclock, potentially reducing battery consumption.
If you try it, let me know how it goes. ROM builders - feel free to integrate this into your ROMs (either the .apk / application, or just the rngd binary called from init.d)! If anyone's interested, I've launched a paid app on the Play store for non-xda users. As I add features I'll post the new versions here as a thanks to you guys (and xda community at large for being such a great resource). But if anyone's interested in the market's auto-update feature, just thought I'd mention it. ![]() Cheers! ![]() | |
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12th November 2012, 05:23 PM | Senior Member - OPPosts: 151 Join Date: Jul 2008 Location: Montreal | Quote: Will this work for cwmr 6 |
Not yet. If a few people try it and report positive results, I'll make a flashable image. Stay tuned. ![]() I updated the first post with instructions. Please be careful, though! Let me know if you need more detail. | |
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12th November 2012, 05:49 PM | MemberPosts: 65 Join Date: Sep 2012 | Quote: I updated the first post with instructions. Please be careful, though! Let me know if you need more detail. |
I got troubles. Using Terminal Emulator I got an error message when I type the 3rd line ("cp /mnt/sdcard/rngd /system/xbin"), it says: "sh: cp: not found" | |
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12th November 2012, 07:00 PM | Senior Member - OPPosts: 151 Join Date: Jul 2008 Location: Montreal | Quote: I got troubles. Using Terminal Emulator I got an error message when I type the 3rd line ("cp /mnt/sdcard/rngd /system/xbin"), it says: "sh: cp: not found" |
Where did you transfer rngd to on your phone? Have to make sure the source path matches. | |
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12th November 2012, 07:15 PM | MemberPosts: 65 Join Date: Sep 2012 | Quote: Where did you transfer rngd to on your phone? Have to make sure the source path matches. |
It does match, that's why I'm confused.. :\ which terminal do you use? | |
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12th November 2012, 07:18 PM
(Last edited by Zero Computing; 12th November 2012 at 07:50 PM.) | MemberPosts: 49 Join Date: Sep 2012 |
Will test this later, for sure! If all goes well, may I request permissions to include this with the MIUI build I will be learning to make and attempting to produce? edit: My phone wasnt particularly laggy before except when playing games, but there is a noticeable difference after executing this binary. Noticed a few small hangs but unsure if it is related to this binary. | |
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12th November 2012, 08:06 PM
(Last edited by thegreatergood; 12th November 2012 at 08:25 PM.) | Senior MemberPosts: 409 Join Date: Sep 2012
DONATE TO ME |
I've tested it ... integrated it into my rom and installed ... there was no lag even right after it first boot ... its incredibly smooth ... though I too noticed small hangs ... though I attributed this to the device getting ahead of itself .... Sent from my SGH-I927 using xda premium | |
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I updated the first post with instructions. Please be careful, though! Let me know if you need more detail.