Messages in this thread Patch in this message | | | Date | Sun, 28 Dec 2003 11:35:00 +0100 | From | Willy Tarreau <> | Subject | Re: [ANNOUNCE] 2.6.0-tiny1 tree for small systems |
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On Sat, Dec 27, 2003 at 03:56:06PM -0600, Matt Mackall wrote: > This is the second release of the -tiny kernel tree. The aim of this > tree is to collect patches that reduce kernel disk and memory > footprint as well as tools for working on small systems. Target users > are things like embedded systems, small or legacy desktop folks, and > handhelds.
Hi Matt,
This looks very interesting. I could produce a small "bloated" kernel which I use for kexec and remote recovery on a VIA C3-based system :
text data bss dec hex filename 1328734 118955 52016 1499705 16e239 vmlinux
This was with gcc-3.3.1 which is more efficient than its predecessors on -Os.
I changed -march=c3 to -march=i386, which generally gives me better numbers :
text data bss dec hex filename 1287578 118955 52016 1458549 164175 vmlinux
=> this is 40 kB saved. I simply changed this :
--- ./arch/i386/Makefile Sun Dec 28 10:35:23 2003 +++ ./arch/i386/Makefile Sun Dec 28 11:16:10 2003 @@ -44,7 +44,7 @@ cflags-$(CONFIG_MWINCHIPC6) += $(call check_gcc,-march=winchip-c6,-march=i586) cflags-$(CONFIG_MWINCHIP2) += $(call check_gcc,-march=winchip2,-march=i586) cflags-$(CONFIG_MWINCHIP3D) += $(call check_gcc,-march=winchip2,-march=i586) -cflags-$(CONFIG_MCYRIXIII) += $(call check_gcc,-march=c3,-march=i486) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0 +cflags-$(CONFIG_MCYRIXIII) += -march=i386 $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0 cflags-$(CONFIG_MVIAC3_2) += $(call check_gcc,-march=c3-2,-march=i686) CFLAGS += $(cflags-y)
So it might be interesting to have an option to drop back to the smallest common arch during compilation. Note that this is not the same as choosing i386 as the target system, since this kernel still has C3 features. Perhaps the simplest and most portable way would be to create a new config entry which would override default cflags ?
Cheers, Willy - 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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