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Adrien
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Joined: 13 Jul 2004
Posts: 2308
Location: Bretagne
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 Posted: Fri Feb 25, 2005 2:55 pm Post subject: [CFLAGS] need a few more details Celeron 466MHz (solved) |
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I'm installing gentoo on a celeron 466MHz at the moment, as I'd like to use this old machine as a router, web/mail/ftp server and firewall. 
At the moment I'm asking myself some questions about the -march CFLAG. I found this in the forum and this quote is also about a Celeron 466 MHz :
| Twist wrote: | | Code: | | CFLAGS="-O2 -march=pentium4 -momit-leaf-frame-pointer -pipe" |
would be a good start. I don't recommend -O3, and it will increase your compilation time besides. omit-leaf-frame-pointer is the safe version of omit-frame-pointer. And yes, a Celeron is an "pentium4".
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The fact is I already start compiling the system with CFLAG: -march=i686 ! 
Is it going to change much about performances if I leave as is ? Would it really be better to put -march=pentium4 instead?
If some of you experienced these differents CFLAGS or know more than I do about CFLAGS (which is quite possible  ) I'll be glad to hear you! 
regards,
Last edited by Adrien on Fri Feb 25, 2005 3:04 pm; edited 1 time in total |
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adaptr
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Joined: 06 Oct 2002
Posts: 6730
Location: Rotterdam, Netherlands
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| Posted: Fri Feb 25, 2005 3:00 pm Post subject: |
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Compiling with march=pentium4 for a Celeron 466 (which is internally a Pentium-2) is not actually possible.
Use the P2 settings recommended by the guide you can Google in about 3 seconds.
There is, however, a difference between march=686 and march=pentium2.
The 686 is a Pentium Pro, so using that arch will not utilise everything the Pentium2 has to offer.
Just use march=pentium2.
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Adrien
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Joined: 13 Jul 2004
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Location: Bretagne
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| Posted: Fri Feb 25, 2005 3:03 pm Post subject: |
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| adaptr wrote: | | Use the P2 settings recommended by the guide you can Google in about 3 seconds. |
Definitely but, this -march=pentium4 is the reason why I'm writing, it just surprised me a little bit!
| adaptr wrote: | | Just use march=pentium2. |
Thanks for this 
cheers!  |
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