Messages in this thread | | | Date | Sat, 26 Jan 2002 17:48:00 +0000 | From | Jamie Lokier <> | Subject | Re: [ACPI] ACPI mentioned on lwn.net/kernel |
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Jeff Garzik 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. Maybe the size optimizations > > doesn't show on these files? Internal data structures that are much bigger > > than "real" code? > > That doesn't tell us much unless you benchmark any speed > improvements/degradations noticed. Hidden in that 1% may be more > favorable I-cache usage, better register usage... who knows. > > It would also be interesting to compile key files like kernel/sched.c or > mm/vmscan.c in assembly using O2 and Os, and compare the output with > diff -u.
It'd be good to know why it's not achieving the quoted 30% space saving that other compilers manage for normal code, unless it's myth of course.
-- Jamie - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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