Hi,
regarding boot time optimization, on an embedded ARM Cortex-A9 based
system with 512MB or 1GB main memory, we found that initializing this
main memory takes a somehow large amount of time.
Initializing 512MB takes <= ~100ms, the additional 512MB on the 1GB
take <= ~100ms additionally, too. So in sum <= ~200ms for 1GB.
Having a short look to this, it looks like most of the time is spent
in arch/arm/mm/init.c in
bootmem_init()/arm_bootmem_init()/arm_bootmem_free().
Has anybody already looked into this if there are any optimizations
possible? Maybe even some hacks, if the main memory size (512MB/1GB)
is always known? Any pointers?
I'm looking for reducing (a) the overall init time and maybe (b) the
dependency on the memory size.
Thanks
Dirk
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