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antiloaded
n00b
Joined: 14 Nov 2005
Posts: 30
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 Posted: Sun Apr 16, 2006 8:35 am Post subject: What architecture P4 or i686? |
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Hi,
When I boot from the live installer CD and starts the installation it comes up choosing the i686 architecture per default. I have a P4 so I changed it to that.
Should I go with the suggested architecture or pick it manually?
Regards, |
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anello
Guru
Joined: 17 Jul 2005
Posts: 557
Location: EU -> DE -> Stuttgart
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| Posted: Sun Apr 16, 2006 9:46 am Post subject: |
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If you run a P4 than why wouldn't you choose P4?
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cybermonkey
Apprentice
Joined: 11 Aug 2003
Posts: 194
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| Posted: Sun Apr 16, 2006 10:01 am Post subject: |
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Change your 'march=' FLAG in your etc/make.conf to the processor you have, that way you will be compiling programmes
that makes the most of your processor. I686 is generic across intell & amd.
Also if your P4 has Hypthreading, then in your /etc/make.conf use '-j3' instead of '-j2' and enable 'smp' when you build your kernel. |
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jmbsvicetto
Moderator
Joined: 27 Apr 2005
Posts: 4734
Location: Angra do Heroísmo (PT)
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| Posted: Sun Apr 16, 2006 1:14 pm Post subject: |
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Hi.
| cybermonkey wrote: | | I686 is generic across intell & amd. |
You need to be careful. Some of the oldest amd processors, I believe athlon and athlon-thunderbird, were not compatible with i686. One error commonly reported in this forum was athlon users trying to install their system with the i686 live-cd and having a segmetation fault when they did the chroot.
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AMD64 / x86 / Sparc Gentoo
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cybermonkey
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Joined: 11 Aug 2003
Posts: 194
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| Posted: Sun Apr 16, 2006 3:57 pm Post subject: |
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| jmbsvicetto wrote: | Hi.
| cybermonkey wrote: | | I686 is generic across intell & amd. |
You need to be careful. Some of the oldest amd processors, I believe athlon and athlon-thunderbird, were not compatible with i686. One error commonly reported in this forum was athlon users trying to install their system with the i686 live-cd and having a segmetation fault when they did the chroot. |
Good point, should of been more specific. |
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cyrillic
Watchman
Joined: 19 Feb 2003
Posts: 7313
Location: Groton, Massachusetts USA
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| Posted: Sun Apr 16, 2006 11:44 pm Post subject: |
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Actually, all Athlons and Durons are i686 compatible.
It is the AMD K6 series of chips that are only i586 (in spite of the "6" in the name). |
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dmartinsca
Guru
Joined: 09 Dec 2005
Posts: 303
Location: Ontario, Canada
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| Posted: Mon Apr 17, 2006 12:54 pm Post subject: |
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| cybermonkey wrote: |
Also if your P4 has Hypthreading, then in your /etc/make.conf use '-j3' instead of '-j2' and enable 'smp' when you build your kernel. |
Is hyperthreading the reason I have seen some P4's report 2 identical processors during the POST sequence, in windows device manager, and in linux? |
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cybermonkey
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Joined: 11 Aug 2003
Posts: 194
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| Posted: Mon Apr 17, 2006 1:14 pm Post subject: |
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| dmartinsca wrote: | | cybermonkey wrote: |
Also if your P4 has Hypthreading, then in your /etc/make.conf use '-j3' instead of '-j2' and enable 'smp' when you build your kernel. |
Is hyperthreading the reason I have seen some P4's report 2 identical processors during the POST sequence, in windows device manager, and in linux? |
It is.
Basically it gives 50% of the cpu to 1 app so another app can have the other half, kind of a poor mans dual core. |
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