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trapni
Retired Dev
Joined: 16 May 2002
Posts: 251
Location: Germany/Berlin
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 Posted: Fri May 17, 2002 12:29 am Post subject: AMD AthlonMP optimizations? |
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Hi all,
I am working on an AMD AthlonMP dual processor machine and recently moved to Gentoo on my/that desktop. I know that this machine is i686 compatible, but does there exist some special optimization features?
Well, my /proc/cpuinfo tells me the following (for cpu 0 and cpu 1):
| Code: | vendor_id : AuthenticAMD
cpu family : 6
model : 6
model name : AMD Athlon(tm) MP Processor 1500+
stepping : 2
cpu MHz : 1333.398
cache size : 256 KB
fdiv bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_excaption : yes
cpuid leve : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
bogomips : 2660.76 |
So far so good. What I can conclude now is, that I could optimize for instruction sets as SSE1, MMX, MMXExt!, 3DNow, 3DNowExt!, etc(?).
Now my /etc/make.conf has the following main variables:
| Code: | CHOST="i686-pc-linux-gnu"
CFLAGS="-march=i686 -O3 -pipe"
CXXFLAGS="$CFLAGS" |
As you can see, really conventional. So how can I optimize my apps to be maked for my machine?
Please, can anyone help me?
many many thanks,
Christian Parpart. |
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mb
Guru
Joined: 25 Apr 2002
Posts: 355
Location: Hessen | .de
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| Posted: Fri May 17, 2002 12:06 pm Post subject: |
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hi...
only gcc3.x supports athlon specific optimization features.. link your /etc/make.profile to /usr/portage/profiles/default-1.0-gcc3 and start recompile the system starting with gcc3 (twice?) and glibc and so on...
and set your compile settings to something like this:
| Code: |
CHOST="i686-pc-linux-gnu"
CFLAGS="-march=athlon -O3 -pipe"
CXXFLAGS="-march=athlon -O3 -pipe"
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#mb |
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Guest
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| Posted: Fri May 17, 2002 1:41 pm Post subject: |
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GCC 3.1 even supports things such as
-march=athlon-mp
-mmmx
-msse
-m3dnow
-mfpmath=sse
But because many packages still fail to compile with that new gcc I can't recommend switching to it as standard compiler. So until Gentoo switched to gcc 3.1 I recomment the usual -march-i686 -O3.
Cheers,
Andreas Simon |
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