Messages in this thread | | | From | Matteo Croce <> | Date | Fri, 6 Nov 2009 23:18:06 +0100 | Subject | Re: i686 quirk for AMD Geode |
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On Fri, Nov 6, 2009 at 5:44 PM, H. Peter Anvin <hpa@zytor.com> wrote: > On 11/06/2009 06:59 AM, Matteo Croce wrote: >> indeed it has MMX, MMXEXT and CMOV, just lacks the long NOP instruction (NOPL). > > MMX and MMXEXT are hardly hallmarks of i686, which leaves only cmov. > I'm somewhat wondering about the general value of this patch; is i686 > code really that much faster on Geode that it's worth it? > > -hpa > > -- > H. Peter Anvin, Intel Open Source Technology Center > I work for Intel. I don't speak on their behalf. > >
yes, I did some test like gzip, bzip2, lame etc and they give more or less the same results of dhrystone
root@alix:/usr/src# CFLAGS='-march=i586' ./dry.c gcc -c -O3 -march=i586 ./dry.c -o dry1.o gcc -DPASS2 -O3 -march=i586 ./dry.c dry1.o -o dry2
Dhrystone Benchmark, Version C, Version 2.2 Program compiled without 'register' attribute Using times(), HZ=100
Trying 5000000 runs through Dhrystone: Microseconds for one run through Dhrystone: 1.4 Dhrystones per Second: 740741
root@alix:/usr/src# CFLAGS='-march=i686' ./dry.c gcc -c -O3 -march=i686 ./dry.c -o dry1.o gcc -DPASS2 -O3 -march=i686 ./dry.c dry1.o -o dry2
Dhrystone Benchmark, Version C, Version 2.2 Program compiled without 'register' attribute Using times(), HZ=100
Trying 5000000 runs through Dhrystone: Microseconds for one run through Dhrystone: 1.2 Dhrystones per Second: 841751 -- 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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