Boot Time Optimizations - Tslib static modules

05.01.2010 at 10:24

I am trying to speed up the boot process of my little initramfs.

It currently takes about 8.5 seconds from power to the graphical menu. I tested the different kernel compression methods with a patch from Albin Tonnerre which should hopefully end up in 2.6.33. My mesurements show that an LZO compressed kernel saves about 0.5-0.6 seconds.

In kernel land I need to read up on a few things like async/deferred initcalls.

On the userspace front I tried to link my boot application statically which should have 2 advantages.

One thing I need to try out is to link everything statically expect libc which is required by other stuff (kexec, dropbear, busybox). I *think* this should work with a few linker flags but I am not yet sure how it behaves in practice.

-Wl,-Bstatic -leina -lts ... -Wl,-Bdynamic -lc

Fortunately the modular design of the EFL which dlopen(3) modules at runtime also has an option to build said modules statically which means the code will be embedded into the main shared object. This can be enabled at compile time with

./configure --enable-$FOO=static

Unfortunately the same is not possible with stock tslib plugins which is why I wrote a patch to support it.

On a somewhat unrelated note the only thing I hate more than mailing list which are configured for member only posts are mailing lists with slow moderation for non member posts. Grumble.

Marc

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