USE flags and /cpuinfo

[SAngeli]

Hi,

I wish to clarify this question:

I know that there are several important USE Flags, like mmx, mmx2, sse, sse2, 3dnow, 3dnowex (If you additional important ones please tell me.

1) How do I determine which of them are supported? (cat /proc/cpuinfo)
2) How to check if I need to add 3dnow, 3dnowex
3) How about mtrr use flag (and kernel setting)? Do I have to add it too as use flag?

Lets say my cpu outputs:

[pactoo]

> Does it mean mmx2, sse2, 3dnow, 3dnowex are not supported and therefore I should NOT place them in the USE flag list?

Yes, it does mean exactly this. Answers your question 2, too. As for mtrr, I do not know either, what this is, I just enabled it in the kernel as well as in my USE flags. Does not seem to hurt, though

[Harbir]

Hello Guys!
I want to know what are USE Flags, where can i find more information on it. I am new to Linux, therefore I am not familiar with many of the things.

[gbkyle]

Harbir, check the gentoo install manual or google USE Flags

[SAngeli]

Hi Harbir,

here some references:

- http://gentoo-wiki.com/Safe_Cflags
- http://linuxreviews.org/gentoo/flagguide/#toc2
- http://gentoo-portage.com/USE
- http://gentoo-wiki.com/FAQ_USE_Flags
- http://gentoo-wiki.com/USE_Flags_explained

Also, you might want to emerge ufed, ( http://packages.gentoo.org/search/?sstring=ufed ) which will assist you in setting up your USE flags from your console windows.

Hope this will help you.

Have a good day,
Spiro

[thechris]

useflages you may find interesting:
nptl -- for glibc. the native posix threading library should be an improvement over linuxthreads.
pic -- for better use in prelinking.


is this a p3? in anycase, my amd64 gives:

flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmovpat pse36 clflush mmx fxsr sse sse2 pni syscall nx mmxext fxsr_opt lm 3dnowext 3dnow lahf_lm

obviosuly i don't have the revision E as there is no sse3 suport on my cpu.
_________________
HW problems. It's a VIA thing.