Re: [PROPOSAL] Android boot time improvements

Geert Uytterhoeven

On Thu, Oct 3, 2013 at 9:31 AM, Jean-Christophe PLAGNIOL-VILLARD
<plagnioj@...> wrote:
Android boot time could be dramatically improved by leveraging
checkpoints/snapshots approaches (might be sufficient for variety of
products/use cases), on the other side it would be great to study
deeper if Android cold boot speed could be improved, at least for
automotive/IVI scenarios (get display/video/audio enabled early)
what is the booting target?

I've done in the past on non optimised android < 30s from cold start to UI
on arm926ejs with base Android < 30s
on more complex and full feature Android on Cortex-A9 (5 MiB kernel) < 30s
with optimised bootloader (barebox)
Hmm, 30 seconds can be a long time ;-)

For user interaction, the typical guideline is: upon any user activity,
the system should respond within 500 ms, either by performing the
operation, or by giving an indication about it's progress.

if I e.g. fetch my camera and turn it on, I want to take a picture within
500 ms.



Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds

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