On Thu, 2009-10-08 at 08:53 -0700, J. William Campbell wrote: > Peter Tyser wrote: > > On Thu, 2009-10-08 at 22:54 +1100, Graeme Russ wrote: > > > >> Out of curiosity, I wanted to see just how much of a size penalty I am > >> incurring by using gcc -fpic / ld -pic on my x86 u-boot build. Here are > >> the results (fixed width font will help - its space, not tab, formatted): > >> > >> Section non-reloc reloc > >> --------------------------------------- > >> .text 000118c4 000137fc <- 0x1f38 bytes (~8kB) bigger > >> .rodata 00005bad 000059d0 > >> .interp n/a 00000013 > >> .dynstr n/a 00000648 > >> .hash n/a 00000428 > >> .eh_frame 00003268 000034fc > >> .data 00000a6c 000001dc > >> .data.rel n/a 00000098 > >> .data.rel.ro.local n/a 00000178 > >> .data.rel.local n/a 000007e4 > >> .got 00000000 000001f0 > >> .got.plt n/a 0000000c > >> .rel.got n/a 000003e0 > >> .rel.dyn n/a 00001228 > >> .dynsym n/a 00000850 > >> .dynamic n/a 00000080 > >> .u_boot_cmd 000003c0 000003c0 > >> .bss 00001a34 00001a34 > >> .realmode 00000166 00000166 > >> .bios 0000053e 0000053e > >> ======================================= > >> Total 0001d5dd 00022287 <- 0x4caa bytes (~19kB) bigger > >> > >> Its more than a 16% increase in size!!! > >> > >> .text accounts for a little under half of the total bloat, and of that, > >> the crude dynamic loader accounts for only 341 bytes > >> > >> Have any metrics been done for PPC? > >> > > > > Things actually improve a little bit when we use -mrelocatable and get > > rid of all the manual "+= gd->reloc_off" fixups: > > > > 1) Top of mainline on XPedite5370: > > text data bss dec hex filename > > 308612 24488 33172 366272 596c0 u-boot > > > > 2) Top of "reloc" branch on XPedite5370 (ie -mrelocatable): > > text data bss dec hex filename > > 303704 28644 33156 365504 593c0 u-boot > > > > > Hi Peter, > Just to be clear, the total text+data length of u-boot with the > "manual" relocations (#1) is LARGER than the text+data length of u-boot > with the "manual" relocations removed and the necessary centralized > relocation code added, along with any additional data sections required > by -mrelocateable (#2), by 768 (dec) bytes?
Hi Bill, Doah, looks like I chose a bad board as an example. The XPedite5370 already had -mrelocatable defined in its own board/xes/xpedite5370/config.mk in mainline, so the above comparison should be ignored as both builds used -mrelocatable. Here's some *real* results from the MPC8548CDS: 1) Top of mainline: text data bss dec hex filename 219968 17052 22992 260012 3f7ac u-boot 2) Top of "reloc" branch (ie -mrelocatable) text data bss dec hex filename 219192 20640 22980 262812 4029c u-boot So the reloc branch is 2.7K bigger for the MPC8548CDS. Best, Peter _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
