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Date: Mon, 9 Nov 2009 22:03:35 +0100 From: Matteo Croce <technoboy85@...il.com> To: Lennart Sorensen <lsorense@...lub.uwaterloo.ca> Cc: "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org Subject: Re: i686 quirk for AMD Geode On Mon, Nov 9, 2009 at 9:16 PM, Lennart Sorensen <lsorense@...lub.uwaterloo.ca> wrote: > On Sun, Nov 08, 2009 at 07:42:48PM +0100, Matteo Croce wrote: >> There is a small advantage, but considering that GCC isn't much geode aware yet >> there is stil room for improvement IMHO: > > Perhaps gcc considers geode to mean geode GX[m12] not geode LX (which is > newer and the one in question here). > > The Geode GX line prefers i486 code to i586 code (which appears to be > what -march=geode is for). I am using i486 at the moment when I build > for this one. > > The Geode LX is what is being discussed which is in fact mostly a K6 as > far as I understand things. It seems to like i686 code, other than > apparently those NOP instructions. I wonder if the K6 has those noop > instructions and if not, perhaps gcc 4.4's -march=k6-3 would be the > right choice. I have always suspected the LX was really a K6-3 based > design (the cache sizes are a bit different, but clock speeds and > instruction sets seem to match). > > The Geode NX (which no one has mentioned yet) is an Athlon derived chip. > >> root@...x:/usr/src/dist# ll >> totale 257M >> -rwxr-xr-x 1 1000 src 93K 8 nov 2009 bzip2-i586 >> -rwxr-xr-x 1 1000 src 93K 8 nov 2009 bzip2-i686 >> -rwxr-xr-x 1 1000 src 60K 8 nov 2009 gzip-i586 >> -rwxr-xr-x 1 1000 src 60K 8 nov 2009 gzip-i686 >> -rw-r--r-- 1 1000 src 256M 8 nov 2009 linux-2.6.31.5.tar >> -rwxr-xr-x 1 1000 src 90K 8 nov 2009 lzma-i586 >> -rwxr-xr-x 1 1000 src 94K 8 nov 2009 lzma-i686 >> root@...x:/usr/src/dist# time cat linux-2.6.31.5.tar >/dev/null >> >> real 0m10.168s >> user 0m0.030s >> sys 0m1.390s >> root@...x:/usr/src/dist# time ./gzip-i586 -9 < linux-2.6.31.5.tar >/dev/null >> >> real 5m22.331s >> user 5m10.820s >> sys 0m11.170s >> root@...x:/usr/src/dist# time ./gzip-i686 -9 < linux-2.6.31.5.tar >/dev/null >> >> real 5m3.737s >> user 4m51.880s >> sys 0m11.510s >> root@...x:/usr/src/dist# time ./bzip2-i586 -9 < linux-2.6.31.5.tar >/dev/null >> >> real 9m16.539s >> user 9m4.410s >> sys 0m11.760s >> root@...x:/usr/src/dist# time ./bzip2-i686 -9 < linux-2.6.31.5.tar >/dev/null >> >> real 8m48.682s >> user 8m34.950s >> sys 0m13.260s > > -- > Len Sorensen > You're right, indeed this is being discussed here: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41989 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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