Re: [gentoo-amd64] Please suggest settings and flags in /etc/make.conf?

[Lie Ryan]

On 01/22/10 16:26, Peter Humphrey wrote:
> On Friday 22 January 2010 03:05:55 Lie Ryan wrote:
>> On 01/22/10 11:44, Mark Knecht wrote:
>
>>> # These are the USE flags that were used in addition to what is
>>> provided by the # profile used for building.
>>> USE="mmx sse sse2"
>>
>> No one size fits all, only you can decide the best USE flags combination
>> for your use. You probably wouldn't know the USE flags to use until you
>> emerged some programs. Before emerging, look at the USE flags and decide
>> whether you will need the feature activated by the flag, and whether you
>> want to activate the USE flags globally (add here) or locally for the
>> specific package (in /etc/portage/package.use).
>
>>> 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
>>> syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good
>>> xtopology nonstop_tsc pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2
>>> ssse3 cx16 xtpr pdcm sse4_1 sse4_2 aes lahf_lm ida tpr_shadow vnmi
>>> flexpriority ept vpid
>
> What I did recently is to go through the list of CPU flags one by one and
> check which of them had corresponding USE flags; I set those in make.conf on
> the assumption that, if the processor had that feature, I might as well let
> it use it.
>

I can tell you that's actually a lot of work. A certain technology may
be called differently in the CPU flags and in USE flags; and often even
after activating the USE flags, you may still need to find the feature
in kernel config. I always wished there is a website that listed the CPU
flags with the relevant kernel config and/or USE flags.