blaz000 Posted January 29, 2015 Report Share Posted January 29, 2015 My CPU has these features: 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 nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida arat dtherm tpr_shadow vnmi flexpriority ept vpid Should I enter all of them in make.conf? Most of online information include only few of them e.g. USE="mmx sse sse2" Thanks Link to comment Share on other sites More sharing options...
adessemond Posted January 30, 2015 Report Share Posted January 30, 2015 No please don't, CPU flags shown in /proc/cpuinfo are totally unrelated to Funtoo's package system. They only give a hint about what your CPU supports. Link to comment Share on other sites More sharing options...
Oleg Vinichenko Posted January 30, 2015 Report Share Posted January 30, 2015 that's explained in draft news, thx to Micha? G?rny. There was no real gain in such conversion, but since its implemented, here it is http://www.funtoo.org/News:CPU_FLAGS_X86 blaz000 1 Link to comment Share on other sites More sharing options...
digifuzzy Posted February 2, 2015 Report Share Posted February 2, 2015 Clarification needed. I understand if others had these flags set in USE flags they need to move. For those of us that did NOT set these flags, do we NEED or SHOULD set using the suggested script? Link to comment Share on other sites More sharing options...
adessemond Posted February 3, 2015 Report Share Posted February 3, 2015 In the case you don't set the use flags related to processor's instructions sets, the softwares you will compile will simply not take any advantage of built-in CPU hardware support for some of their operations. However not all packages but multimedia stuff (typical case) make use of enhanced processor instructions. If you want to check what package use what flag equery h will tell: # equery h mmx * Searching for USE flag mmx ... [IP-] [ ] media-libs/smpeg-0.4.4-r10:0 [IP-] [ ] media-sound/lame-3.99.5-r1:0 [IP-] [ ] media-video/mjpegtools-2.1.0-r2:1 To answer your question: you SHOULD enable support for CPU's enhanced instructions, unless you have a good reason to leave it disabled (i.e. known bug, strange crash....) However to bring a bit of nuance: a use flag is simply a handle given to you by an ebuild developer to enable/disable some features at compilation time, not having a use flag in a ebuild is not a warranty that the software will not include some CPU special instructions in its binary code. digifuzzy and spectromas 2 Link to comment Share on other sites More sharing options...
danielv Posted July 9, 2015 Report Share Posted July 9, 2015 moving post about microcode files. Link to comment Share on other sites More sharing options...
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