Got a new CPU need some help with flags and kernel config

lum-X · Last edited by lum-X on Wed May 04, 2011 10:56 am; edited 1 time in total

Hi to all,

I just moved from intel t5550 to intel x9000 on m Gateway FX-6860 ( link to intel for CPU ). i did a fresh install on for windows but i want to do another one for gentoo and try to use my CPU more. i dont want to start and rush up like e did on the first time about a month ago since i learned a lot afterwards. So i want to make a system a but more faster, use more flags( can i set sse3 and ssse3 or sse4.1 and so on since i dont know a lot now ) and make it only for my machine

.
I also want to start moving to gentoo and make it a full operating system so that i will use everyday and leave windwos only for gaming if i do.

this is my lspci, since i forgot to do the same for USB and CPU i will do it now and post it later. another question si i am reading that ext4 is faster than ext3. what to o with that.

if i ask a lot i want to learn so please forgive me :lol:

audiodef · Posted: Tue May 03, 2011 2:05 pm Post subject:

You'll get better answers about your CPU from people other than me, but I can tell you with great confidence you'll learn a lot and have a nice kernel config by using Pappy's Kernel Seeds. Click on the "Projects" link in my sig, then look for "Pappy's Kernel Seeds" in the left menu.

I always use a kernel seed. Pappy has me proof-read pages before he publishes them, so I've read every page. You don't have to read every page, though. Just follow the basic setup for a kernel seed.

Ask questions of either me or Pappy. Go here if you want to post a question in the kernel seeds thread.
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lum-X · Posted: Tue May 03, 2011 5:40 pm Post subject:

oo yes i saw that today it was helpful. i think i will make a kernel tonight as soon as a eat some food cause i just got back from 2 hour swim session and since i can cange it i can make it smallet by the time and maybe when gnome3 is out i will do another fresh install with more research. i hate when i want to do something so bad and there are exams or assingmets. i really love this thing

I believe that my CFLAGS are OK but if there is anything more that i can squeeze out of mu PC it would be nice

IRQsRFun · Posted: Sun May 08, 2011 6:21 pm Post subject:

If you are looking for reasonably safe flags, you may want to check out:

http://en.gentoo-wiki.com/wiki/Safe_Cflags

It may or may not be useful.

NeddySeagoon · Posted: Sun May 08, 2011 6:43 pm Post subject:

lum-X,

CPU flags come in two sorts. Those that go into CFLAGS and CXXFLAGS and are used whenever emerge builds a package.
A good choice here is -march=native which tells gcc to work out whats best for your CPU.
The only time to not use -march=native is if you use distc or icecream to spread builds over several systems.

The second sort are USE flags that correspond to CPU flags, like mmx mmxext and so on.
Some programs have optional sections hand optimised for CPUs that support these features. These USE flags turn on these optional code segments.
You should choose USE flags that match your CPU. Typically, they are used for multimedia programs
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BlackMajick64 · n00b Joined: 02 Apr 2011 Posts: 2

CFLAGS="-O3 -march=corei7 -mtune=corei7 -pipe -funsafe-loop-optimizations -funsafe-math-optimizations -msse4.2"

works "wicked pissah" on core i7 extreme edition 990x . "-march=corei7 -mtune=corei7" flags are only to be used on GCC 4.6.0 or greater, recommend using this as well. compiles faster, code executes faster it seems and overall responsiveness is better in my opinion.

not sure why the makeopts rules are the way they are, i.e. threads + 1, I have 24GB RAM and the 6-core extreme edition 990x and I use MAKEOPTS="-j100" and it goes ridiculous fast with almost no compile failures. Boost regex fails with 100 but I put it down to 60 and it compiles just fine.

Not even joking about the -j100..... if you are in a position where you want the fastest compiles and can tie up all your system resources for awhile try it, you might be pleasantly surprised. Adjust the number down if you have less RAM for sure, but dont be afraid to try MAKETOPS = # of threads times 3x or more , the compiler can handle it very well.
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MAKEOPTS="-j100"