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Mr. Hahn
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 Posted: Mon Apr 14, 2003 2:58 am Post subject: Recompiling kernel for p4 |
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| What is the difference between the regular pentium4 option and the Pentium4(gcc>31) option? |
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taskara
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| Posted: Mon Apr 14, 2003 2:59 am Post subject: |
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don't know but suffice to say that if you are using GCC 3.1.1 or greater (latest is 3.2.2) then choose the p4>gcc3.1 option.
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jt42
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| Posted: Mon Apr 14, 2003 3:04 am Post subject: |
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With pentium4 only you get the gcc2 arch defines: -march=i686
With pentium4 (gcc >=3.1) you get the gcc3 arch defines: -march=pentium4 -mmmx -msse -msse2
There have been discussions about whether or not using -march=pentium4 is a good thing for portage ebuilds (the /etc/make.conf file talks about generating invalid instructions). Does anyone know whether this is true for kernels as well? |
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Mr. Hahn
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| Posted: Mon Apr 14, 2003 3:36 am Post subject: |
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| jt42 wrote: | With pentium4 only you get the gcc2 arch defines: -march=i686
With pentium4 (gcc >=3.1) you get the gcc3 arch defines: -march=pentium4 -mmmx -msse -msse2
There have been discussions about whether or not using -march=pentium4 is a good thing for portage ebuilds (the /etc/make.conf file talks about generating invalid instructions). Does anyone know whether this is true for kernels as well? |
Yeah I figured it had soemthing to do w/ the march=pentium4 issue w/ the make.conf . Anyways, I forgot to do /sbin/lilo last time I was messing w/ the boot image stuff and setting up the boot loader, so I'm stuck with windoze til the begining of may when my finals finish  . |
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taskara
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| Posted: Mon Apr 14, 2003 3:40 am Post subject: |
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well I think there was a problem with gcc 3.1 and -march=pentium4, but everyone using gcc 3.1> has said they have not had any problems.
I have built a complete system on a dell inspiron notebook 8200 with gcc 3.2.2 and -march=pentium4. no problems at all so far.
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Mr. Hahn
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| Posted: Mon Apr 14, 2003 6:51 am Post subject: |
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| taskara wrote: | well I think there was a problem with gcc 3.1 and -march=pentium4, but everyone using gcc 3.1> has said they have not had any problems.
I have built a complete system on a dell inspiron notebook 8200 with gcc 3.2.2 and -march=pentium4. no problems at all so far. |
What all is in your cflag? |
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taskara
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| Posted: Mon Apr 14, 2003 6:53 am Post subject: |
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just | Quote: | | -march=pentium4 -03 -fomit-frame-pointer |
nothing too drastic 
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Mr. Hahn
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| Posted: Mon Apr 14, 2003 7:47 am Post subject: |
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| taskara wrote: | just | Quote: | | -march=pentium4 -03 -fomit-frame-pointer |
nothing too drastic |
You don't have any problems running the -O3? I thought that was just an Athlon thing, bu for P4s -O2 was best. I just watn the most optimization I can and still run a pretty stable setup (otherwise I'd use windoze, stupid unstable piece of crap). |
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taskara
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| Posted: Mon Apr 14, 2003 7:51 am Post subject: |
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like I mentioned.. I haven't had a single compiling issue.. atm I am compiling openoffice with those settings, and it's going strong.
I think -03 is safe
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Mr. Hahn
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| Posted: Mon Apr 14, 2003 11:39 am Post subject: |
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| taskara wrote: | like I mentioned.. I haven't had a single compiling issue.. atm I am compiling openoffice with those settings, and it's going strong.
I think -03 is safe |
try some of the other flags like -mmmx -msse -msse2 and -mfpmath=sse,387 . I'll do p4 flag, but only for the sse2, the mpfmath doubles you math throughput, and you know the rest. |
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dizzy
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| Posted: Tue Apr 15, 2003 12:29 pm Post subject: |
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| taskara wrote: | well I think there was a problem with gcc 3.1 and -march=pentium4, but everyone using gcc 3.1> has said they have not had any problems.
I have built a complete system on a dell inspiron notebook 8200 with gcc 3.2.2 and -march=pentium4. no problems at all so far. |
Check this thread, gcc-3.2.2 still has problems with -march=pentium4. |
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Mr. Hahn
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| Posted: Tue Apr 15, 2003 4:03 pm Post subject: |
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| Ok, well all I want is sse2 support. Can anyone tell me the best way to set this up in my cflags? |
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taskara
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| Posted: Tue Apr 15, 2003 9:44 pm Post subject: |
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include -sse2
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Mr. Hahn
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| Posted: Wed Apr 16, 2003 2:10 am Post subject: |
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| taskara wrote: | | include -sse2 |
Are you sure? I believe the flag is -msse2, and it *doesn't* work with the -march=pentium3 flag. Did you look that up even? |
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Mr. Hahn
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taskara
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| Posted: Wed Apr 16, 2003 3:50 am Post subject: |
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ahh yeah sorry.. was typing from memory -
-msse2 i your CFLAGS you can also put "sse2" in your USE variables I believe.
and I am pretty sure -march=pentium4 -03 is fine - I have built and entire system with it.. not a single compiling problem - infact I have had less problem with compiling things than with my athlon.. 
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Mr. Hahn
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| Posted: Wed Apr 16, 2003 4:26 am Post subject: |
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| taskara wrote: | ahh yeah sorry.. was typing from memory -
-msse2 i your CFLAGS you can also put "sse2" in your USE variables I believe.
and I am pretty sure -march=pentium4 -03 is fine - I have built and entire system with it.. not a single compiling problem - infact I have had less problem with compiling things than with my athlon.. |
coool, thanks. Hopefully everything will run fin for me too, it ism just that everywhere I see that people say the -march=pentium4 flag causes so many problems |
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taskara
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| Posted: Wed Apr 16, 2003 4:43 am Post subject: |
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if it causes problems.. change back to pentium3! 
I think you'll be right!
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Mr. Hahn
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| Posted: Wed Apr 16, 2003 12:11 pm Post subject: |
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| taskara wrote: | if it causes problems.. change back to pentium3!
I think you'll be right! |
aww man, I did emerge e world before, it was a biznatch! Hopefully it won' t be so bad when I upgrade to a gig of ram (itwas using almost the whole 512 last time!). |
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tolle
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| Posted: Wed Apr 16, 2003 2:21 pm Post subject: |
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| Mr. Hahn wrote: | | Anyways, I forgot to do /sbin/lilo last time I was messing w/ the boot image stuff and setting up the boot loader, so I'm stuck with windoze til the begining of may when my finals finish . |
Eh? Just boot with the installation cd and run lilo? takes like nada time. |
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Mr. Hahn
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| Posted: Wed Apr 16, 2003 3:23 pm Post subject: |
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Last edited by Mr. Hahn on Wed Apr 16, 2003 3:24 pm; edited 1 time in total |
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Mr. Hahn
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| Posted: Wed Apr 16, 2003 3:23 pm Post subject: |
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| tolle wrote: | | Mr. Hahn wrote: | | Anyways, I forgot to do /sbin/lilo last time I was messing w/ the boot image stuff and setting up the boot loader, so I'm stuck with windoze til the begining of may when my finals finish . |
Eh? Just boot with the installation cd and run lilo? takes like nada time. |
well too late now, my idiot arse replaces it all w/ an ntfs partition to store like 80 gigs of movies. Getting one of those 120GB Seagate Barracuda 5s so, My gentoo install will be on that one. |
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