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johnnytheswede
n00b
Joined: 12 Mar 2010
Posts: 21
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 Posted: Tue Feb 22, 2011 4:10 pm Post subject: Why the architecture = pentium4 in XEN? |
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I am gathering information to install XEN hypervisor on my computer, I today run an ordinary Gentoo. What I am wondering is why I need to put arch=pentium4 in my make.conf... I google around and can't find the reason. Can I go with arch=nocona (Core 2) which work fine for ordinary Gentoo or is XEN in special need of arch=pentium4?
Greetings
Johnny
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I used to be undecided, but, uhm... now I don't really know anymore |
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teg
n00b
Joined: 20 Feb 2011
Posts: 6
Location: OSTROWIEC ŚWIĘTOKRZYSKI
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| Posted: Tue Feb 22, 2011 9:01 pm Post subject: |
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| Not to make another topic: I have similar question. I want to compile kernel and software for 64-bit Virtual Machine. But it will have to work on different architectures: on Intel Core2Duo (and higher) 64 bit CPU's and on AMD Athlon (and higher) Multi-core 64bit CPUs. Which 'CFLAGS= -march=???' option should I use - maybe 'nocona'? I want it to be optimized for x64, it won't have to run on x32 systems. Please help me quickly, I have little time left to finish this. |
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mbar
Veteran
Joined: 19 Jan 2005
Posts: 1991
Location: Poland
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| Posted: Wed Feb 23, 2011 7:28 am Post subject: |
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| Yes, use 'nocona'. |
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idella4
Retired Dev
Joined: 09 Jun 2006
Posts: 1600
Location: Australia, Perth
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| Posted: Wed Feb 23, 2011 2:28 pm Post subject: |
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On my 32 bit genny, complete with xen,
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idella@genny /mnt/karmic/boot/grub $ grep -e CFLAGS /etc/make.conf
CFLAGS="-march=core2 -fomit-frame-pointer -pipe -O2 -mno-tls-direct-seg-refs"
CXXFLAGS="${CFLAGS}"
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On my gentoo64 complete with xen,
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idella@genny /mnt/karmic/boot/grub $ grep -e CFLAGS /mnt/gentoo64//etc/make.conf
CFLAGS="-march=core2 -fomit-frame-pointer -pipe -O2 -mno-tls-direct-seg-refs -ggdb"
CXXFLAGS="${CFLAGS}"
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| Code: |
idella@genny /mnt/karmic/boot/grub $ uname -a
Linux genny 2.6.36-tuxonice #15 SMP Sat Nov 20 00:43:37 WST 2010 i686 Intel(R) Core(TM)2 Duo CPU E6550 @ 2.33GHz GenuineIntel GNU/Linux
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cjubon
Guru
Joined: 03 Jul 2007
Posts: 450
Location: Vienna/Europe
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| Posted: Sat Apr 02, 2011 7:37 pm Post subject: |
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| johnnytheswede wrote: | | I am wondering is why I need to put arch=pentium4 |
P4 is just an example, you can also specify i686 or what not. The point is that you have to add "-mno-tls-direct-seg-refs" only if you deploy xen on a 32bit arch.
@idella4:
Hence, while it’s important to add the "-mno-tls-direct-seg-refs" CFLAG for your 32bit system, it’s not necessary to add "-mno-tls-direct-seg-refs" to your CFLAGS in the gentoo64 case.
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