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Technical stuffTerms Used in Kernel Builds
What is the difference Between HAVS and SVS?HAVS changesthe
voltages used for each frequency, SVS has fixed voltages. HAVS
should give
better battery life, SVS should be more stable. Using lower
voltages or higher frequencies can make
your phone unstable.
What is the difference between CFS and BFS?
You could write a thesis onthis, in fact thisis pretty close to
a thesis. For those that just want a
little knowledge, both are CPU schedulers, that attempt to
schedule multiple processes so they get
an appropriate slice of the CPU resources. CFS outperforms BFS
in minimizing process turnaround
time but BFS outperforms CFS for minimizing latency. This
indicates that BFS is better for interactive
tasks that block on I/O or user input (like your phone) and CFS
is better for batch processing that is
CPU bound. CFS generally seems more stable in . At least one
user has found that BFS makes video
playback with Rockplayer (and probably other Video players)
jumpy. BFS may also cause occasional
jumps in audio playback.
What is AXI and NOAXI?
The memory throughput is directly proportional to the AXI
(internal bus) frequency. For AXI builds,
the AXI freq is coupled with the CPU freq to prevent the memory
from being the bottleneck when the
CPU is running at one of its higher frequencies. This will cause
an increase in power consumption
when the CPU is running at higher frequencies, but will give a
better performance/power ratio
[hugonz]. AXI should further reduce the battery usage when the
screen is on. However, 128Mhz IS
INCOMPATIBLE WITH THIS!!!. So if you want to use the AXI patch,
use SetCPU and define a
profile that sets the minimum speed to 256Mhz when the screen is
on, and sets it back to 128Mhz
when the screen is off. This is NOT necessary with the ManU
kernels as it is done automatically by
the kernel. [EViollet]
What is the difference between BFQ, VR, SIO, NOOP and
Deadline?
These are I/O schedulers. VR is supposed to be the best for
Android see this
What is the difference between SLUB, SLAB, SLOB and SLQB?
These are slab allocators. The slab allocator has been at the
core of unix kernels memory
management for many years. This allocator (sitting on top of the
low-level page allocator) managescaches of objects of a specific
size, allowing for fast and space-efficient allocations. Kernel
hackers
tend not to wander into the slab code because its complex and
because, for the most part, it works
quite well. SLQB seems to be favoured by most AOSP kernels.
Detailed article here
What are DATA2EXT (D2E) and DATA2WHATEVER (D2W)?
(Thanks to Dani for this)
Moving the whole /data system partition onto the SD card was the
original concept
by darkstrumnnamed data2sd. The first developer (ownhere)who
wrote a stable script that moved
/data to the SD card called it data2ext (now dont get confused,
there are other versions, but this one
moves it to sd ext partit ion not the sdcard FAT32 partit ion).
All implementat ions requires a primary
FAT32, then a primary EXT (and that depends on their script,
plus many other factors). But basically
what they want is to move /data into the EXT partition of your
card so people will have HUGE Internal
phone memory whatever they choose. Though there are limitations,
particularly dont partition EXT more
than 2GB.Another developer (melethron) decided to make it more
flexible in moving the /data structure and
called it DATA2WHATEVER!!! The main difference is that the
partit ion can be EXT2, EXT3, EXT4, BTRFS,
Reiserfs, and it is still evolving right now i dont know where
it will end.
The name only implies it can work with any partition, but there
are still issues about sdcard speed and
type, and more.
For most of us, We use EXT3 as partition. I tried ext2, ext4,
reiserfs, btrfs, and my sdcard is not liking
it. So i stick with EXT3. Its up to you what to use though.
Conclusion: DATA2SD and DATA2EXT are the same thing, and require
an EXT3 partition.
DATA2WHATEVER can supposedly use many differents formats for the
partition.
Some advice if you are trying the Data2Anywhere experimental
version.
Melethron has suggested hereto avoid using reboot.
DONT use the reboot of snqs powermenu (or any other reboot
app)
DONT use anything in the ROM Manager that makes it reboot.DONT
do adb reboot / abd reboot recovery / adb reboot bootloader
DONT pull the battery while the phone is on (this should be
obvious)
DONT remove the sync mount options for the Quadrant boost (this
is a fake boost anywa
All of the above are like a powerloss for the sd-card and have a
high change of data
corruption
From my test with this I give you an estimate what can happen if
a powerloss occurs or any of the 5
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