ARM/Thumb-2 kernel size comparison

Dave Martin dave.martin at linaro.org
Wed Apr 20 16:46:34 UTC 2011


The question of the size impact of building the kernel in Thumb-2 came
up to day, so I extracted some quick numbers:

$ size vmlinux-*
   text	   data	    bss	    dec	    hex	filename
8420507	 463356	 826928	9710791	 942cc7	vmlinux-arm
6715539	 463260	 826928	8005727	 7a285f	vmlinux-thumb2

This is for a recent mainline kernel built with the linaro omap config.

In this case we save about 20% for code and read-only data (i.e.,
text) and 17.5% overall -- which accounts for a little under 2MB saved
in this example.

This doesn't take loadable modules into accout; we can probably expect
to see a similar size ratio there.

Cheers
---Dave



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