On Saturday 17 September 2005 16:32, Dan Johansson wrote:
> Hi,
>
> A few days ago I had to replace my Motherboard and CPU. Now I want to make
> use of the new CPUs features.
> Old CPU: Intel Pentium 4
> New CPU: Intel Pentium 4 (Prescott)
ok, remember though, new Motherboard is usually = new IDE controller, new PCI
stuff, etc. Don't forget your kernel too!
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> mca
> cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm pni
> monitor ds_cpl est cid cx16 xtpr
> bogomips: 6340.60
cpu flags here
> So I'm planning to do something along these lines:
>
> 1)Change CFLAGS in make.conf
> Old: CFLAGS="-O2 -mcpu=pentium4 -march=pentium4 -fomit-frame-pointer
> -pipe" New: CFLAGS="-O2 -march=prescott -mmmx -msse -msse2 --pipe
> -fomit-frame-pointer"
Bad, -march=prescott by itself implies this when passed to gcc:
options passed: -v -march=prescott -auxbase
options enabled: -feliminate-unused-debug-types -fpeephole -ffunction-cse
-fkeep-static-consts -fpcc-struct-return -fgcse-lm -fgcse-sm -fgcse-las
-fsched-interblock -fsched-spec -fsched-stalled-insns
-fsched-stalled-insns-dep -fbranch-count-reg -fcommon -fargument-alias
-fzero-initialized-in-bss -fident -fmath-errno -ftrapping-math -m80387
-mhard-float -mno-soft-float -mieee-fp -mfp-ret-in-387
-maccumulate-outgoing-args -mmmx -msse -msse2 -msse3 -mno-red-zone
-mtls-direct-seg-refs -mtune=prescott -march=prescott
main
New: CFLAGS="-O2 -march=prescott -pipe -fomit-frame-pointer"
is enough.
> 2)emerge --emptytree system
> 3)emerge --emptytree world
system is part of world. When you do `emerge system` at the beginning, all
system packages are added to world. I'd say:
`emerge -ev world`
to see what will go down and then
`emerge -e world`
to actually emerge the stuff.
> Would that be the right CFLAGS for this CPU? And would it be the right
> procedure to get my system "up to date" with my new CPU?
Pretty much.
Chris White
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