Will Verduzco · Feb 2, 2012 at 08:30 am

CPU Governor, Kernel Module, I/O Scheduler, and Dual Core Tweaks for Your Newly Flashed Device

OK, so you’ve successfully rooted your brand new $700+ toy and flashed a new kernel or ROM, all while somehow managing to avoid bricking the darn thing. Now what? How do you get the most out of your newly emancipated device?

Back in the younger days of Android hacking, there were generally only a few kernel governors, I/O Schedulers, and modules to choose from. As such, I’m sure most users are aware of the differences between Interactive and On Demand CPU Governors. However, when you start mentioning non-traditional governors such as Brazilianwax, SavagedZen, and Lulzactive—I am sure that more than a few eyes start glazing over.

In order to alleviate this, XDA forum member droidphile has created an extremely useful guide that explains the intricacies of each of these new governors and more. Not only does his guide cover 18 governors, 25 kernel modules, 7 I/O schedulers, and several dual core-only tweaks; but it also explains in detail what ramifications each particular setting affects and how to get the most out of each selection.

Most of us are flash maniacs, and we do it a lot. But after a kernel flash, we wonder:

Q1. “OK i have flashed this xyz kernel. What’re all these governors? How do i know which one is the best for me? How do i tweak them to bias their characters towards Battery-life/Performance/Balance between the Two”.

Q2. “What’s the fuzz about these modules that comes with the kernel. How do i use them. Are they any good. Is it OK to neglect them?”

Q3. “What roles does an i/o scheduler play? How to choose a reliable i/o scheduler?”

Q4. “Can i have more control on CPU? More info and tweaks on dual core CPU, bus frequency, etc?”

Hope this thread could give you answers for all these questions. We’re covering governors, modules, i/o schedulers that comes with Siyah kernel, plus more. That should cover almost all the popular governors/modules/io schedulers! Many people seem to get lost in Kernel dev threads without getting answers about governors and such.

Pretty much everything you’ve ever wanted to learn about kernel and scheduler tweaking awaits you in the guide thread. Just make sure to bring some popcorn and hit Control+D to bookmark, as you’re likely to spend several hours memorizing this fascinating guide.

[Thank you to XDA forum member slayerXcore for the tip!]
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Will Verduzco

willverduzco is an editor on XDA-Developers, the largest community for Android users. Will Verduzco is the Portal Administrator for the XDA-Developers Portal. He has been addicted to mobile technology since the HTC Wizard. But starting with the Nexus One, his gadget love affair shifted to Google's little green robot. He is also a Johns Hopkins University graduate in neuroscience and is now currently studying to become a physician.
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