Android Entropy Generator

hmmm…. looks promising. Muss ich mal mit einem älteren/schwächeren Device testen, mit dem Nexus4 hab ich aufgrund der Hardware nicht mehr diese Lags.

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).

Google's JVM, like Sun's, reads from /dev/random. For all random data. Yes, the /dev/random that uses a very limited entropy pool.

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? I have never used an Android device this fast. It is literally five times faster in many cases. Chrome, maps, and other heavy applications load in about 1/2 a second, and map tiles populate as fast as I can scroll. Task switching is instantaneous. 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!

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