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Since I'm trying to optimize Gentoo on XenServer (as DomU, *not* |
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Dom0), I think this question is best addressed to gentoo-server list. |
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|
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When I was emerging glibc, I got this warning: |
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|
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* You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS. |
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* This will result in a 50% performance penalty when running with a 32bit |
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* hypervisor, which is probably not what you want. |
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|
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A google-fu brought me to this page: |
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|
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http://cs.felk.cvut.cz/~vaclam1/linux/ucebna/k310/data/doc/howto-xen-and-gentoo-en.html#Before_we_begin |
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|
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There, it mentions 2 things to be done: |
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|
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* -mno-tls-direct-seg-refs in CFLAGS |
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* USE=nptlonly for sys-libs/glibc -- which I assume has been |
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superseded with the global USE=nptl |
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|
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Now my questions: |
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|
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1. When do we use either (or both)? |
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|
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1a. I'm compiling Gentoo x86 on XenServer running on an x86-64 (Intel) |
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system, do I need them? |
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|
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1b. I'm compiling Gentoo amd64 on XenServer running on an x86-64 |
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(Intel) system, do I need them? |
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|
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1c. Like (1a), but after completion, I'll migrate the VM onto a |
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XenServer running on a Pentium4 system (32-bit), do I need them? |
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|
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(In other words, it's built on top of an x86-64 physical platform, but |
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will be running on top of an x86 physical platform) |
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|
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TIA for your assistance. |
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|
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Rgds, |
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-- |
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Pandu E Poluan |
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~ IT Optimizer ~ |
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Visit my Blog: http://pepoluan.posterous.com |
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