Messages in this thread | | | Date | Sat, 26 Jan 2002 13:42:52 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: [ACPI] ACPI mentioned on lwn.net/kernel |
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On Sat, 26 Jan 2002, Martin Eriksson wrote: > > Hmm.. I tried to compile the kernel with -Os (gcc 2.96-98) and I just got a > ~1% smaller vmlinux and a ~3% smaller bzImage.
Note that while "-Os" exists and is documented, as far as I know gcc doesn't actually do much with it. It really acts mostly as a "disable certain optimizations" than anything else.
In the 3.0.x tree, it seems to change some of the weights of some instructions, and it might make more of a difference there. But at the same time it is quite telling that "-Os" doesn't even change any of the alignments etc - because gcc developers do not seem to really support it as a real option. It's an after-thought, not a big performance push.
Linus
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