Linus Torvalds <[email protected]> wrote:
>
>
>
> On Mon, 31 Oct 2005, Andrew Morton wrote:
> >
> > Are you sure these kernels are feature-equivalent?
>
> They may not be feature-equivalent in reality, but it's hard to generate
> something that has the features (or lack there-of) of old kernels these
> days. Which is problematic.
Probably.
> But some of it is likely also compilers. gcc does insane padding in many
> cases these days.
2.6.14 `make allnoconfig':
gcc-2.95.4:
bix:/usr/src/25> size vmlinux
text data bss dec hex filename
665502 152379 55120 873001 d5229 vmlinux
gcc version 4.1.0 20050513 (experimental):
bix:/usr/src/25> size vmlinux
text data bss dec hex filename
761415 151851 55280 968546 ec762 vmlinux
(There's a new reason for retaining gcc-2.95.x support)
(gcc-4.x can probably be tuned up with appropriate `-malign' options)
> And a lot of it is us just being bloated. Argh.
2.5.71, gcc-2.95.4:
bix:/usr/src/aa/linux-2.5.71> size vmlinux
text data bss dec hex filename
501892 54163 40420 596475 919fb vmlinux
yes, it got bigger. .data went through the roof - maybe inlined debug stuff?
2.6.8.1, gcc-2.95.4:
bix:/usr/src/aa/linux-2.6.8.1> size vmlinux
text data bss dec hex filename
605032 153817 58176 817025 c7781 vmlinux
It happened somewhere between 2.5.71 and 2.6.8.
2.4.x doesn't have allnoconfig, so no numbers for that.
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